Home » Public Forums » GMCnet » Bob Drewes' outer CV boot replacement technique
| Bob Drewes' outer CV boot replacement technique [message #369205] |
Mon, 21 March 2022 20:30  |
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Richard RV
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Bob Drewes had posted about his technique for cutting away the outer CV boot and removing the split ring to allow the axle shaft to slide out of the outer CV so a new boot could be put on without removing the axle or disturbing the output shaft bolts or outer spindle nut.
Last Fall I tried to do that on my 1 ton without success, and I ended up removing the half shaft. Does anyone know if Bob's technique works on 1 ton front ends, or only on OEM?
Richard
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
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| [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369208 is a reply to message #369205] |
Tue, 22 March 2022 09:52  |
Dave Stragand
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I couldn't find this procedure. Does anyone have a link? Thanks.
-Dave
1978 Transmode near Pittsburgh
________________________________
From: Richard
Sent: Monday, March 21, 2022 9:30 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Bob Drewes' outer CV boot replacement technique
Bob Drewes had posted about his technique for cutting away the outer CV boot and removing the split ring to allow the axle shaft to slide out of the
outer CV so a new boot could be put on without removing the axle or disturbing the output shaft bolts or outer spindle nut.
Last Fall I tried to do that on my 1 ton without success, and I ended up removing the half shaft. Does anyone know if Bob's technique works on 1 ton
front ends, or only on OEM?
Richard
--
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemonte waiting its turn
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1978 Transmode (403)
Pittsburgh, PA
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| Re: [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369209 is a reply to message #369208] |
Tue, 22 March 2022 11:04 |
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Richard RV
Messages: 631
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Dave Stragand wrote on Tue, 22 March 2022 10:52I couldn't find this procedure. Does anyone have a link? Thanks.
http://www.bdub.net/GMCMotorhome.info/front.html#cv
Pertinent part:
"Replace the CV boot with out removing the axle
Jack up the front of the coach, block it, remove wheel (optional), remove the tie rod from the knuckle(optional, but it will give you more room & flexibility), cut the old boot off, with a snap ring pliers, EXPAND snap ring in the outer CV joint and slide axle towards the inner plunge joint, clean as needed, install new boot on axle, slide axle into outer CV joint, snap ring will expand as axle is pushed into CV joint, MAKE SURE SNAP RING IS SEATED, install grease and position CV boot, burp the air out of the boot and clamp it, try to keep the surface for the outer clamp surface as dry as possible. This is about an 1-1/2 hour job per side, good luck. Bob Drewes in SESD"
Thanks
Richard
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
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| [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369211 is a reply to message #369208] |
Tue, 22 March 2022 11:18 |
James Hupy
Messages: 6806
Registered: May 2010
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Don't know why there is so many boots failing. I still have the outer ones
on my 78 Royale that I put on when I first got my coach back in September
2008. It still has the OEM inner boots from the factory. I have put many,
many thousands of miles on the coach.
I have installed many outer boots on OEM and 1 Ton front ends, with
few come backs. Ken Thoma showed me his technique, which I have always
used. It uses a clamp system called "Band-it" which uses continous 1/4"
wide stainless steel band material and small clips that are closed with a
special proprietary tool. I only band the large end of the boots, and use
zip ties on the small end. Only tighten the zip tie enough so that it will
just slip on the axle and not hold the boot immobile. That way the boot
does not twist and untwist in use.
Jim Hupy
Salem, Oregon
On Tue, Mar 22, 2022, 7:53 AM Dave Stragand wrote:
> I couldn't find this procedure. Does anyone have a link? Thanks.
>
> -Dave
> 1978 Transmode near Pittsburgh
> ________________________________
> From: Richard
> Sent: Monday, March 21, 2022 9:30 PM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] Bob Drewes' outer CV boot replacement technique
>
> Bob Drewes had posted about his technique for cutting away the outer CV
> boot and removing the split ring to allow the axle shaft to slide out of the
> outer CV so a new boot could be put on without removing the axle or
> disturbing the output shaft bolts or outer spindle nut.
>
> Last Fall I tried to do that on my 1 ton without success, and I ended up
> removing the half shaft. Does anyone know if Bob's technique works on 1 ton
> front ends, or only on OEM?
>
> Richard
> --
> '77 Birchaven TZE...777;
> '76 Palm Beach under construction;
> ‘76 Edgemonte waiting its turn
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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| [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369213 is a reply to message #369211] |
Tue, 22 March 2022 12:45 |
Rob
Messages: 651
Registered: November 2013
Location: Victoria, BC
Karma: 3
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I had to replace both of my 1-Ton front end's (installed by Jim Hupy just before I bought the coach) outer boots - I think it was a combination of the early hex head bolts (later versions had smooth carriage bolts?) and soft CV boot material (later ones were more "firm"?). They were both torn with relatively few miles. Not a horrible job replacing them on a 1-Ton - but it seemed like the getting the angles just right was key to the process. Dave Jarvis helped with the first one - and I did the other one the following season.
I left the hex head bolts installed and used some different boots that came from Manny. I may have carriage bolts from Manny as well - but figured "why mess with it?", if things are OK with the new boots. I've got many thousands of miles on the second set of boots.
I also had to replace both front flex hoses - due to interference issues with the front axle shaft (RHS) and control arm (LHS). The first failure was dangerously close to converting me to becoming religious...
Just looked it up - 1-Ton was installed in the first half of 2012! I think the later versions used the different parts.
Rob
76 Royale Twin Beds, Dry Bath
Victoria, BC
> On Mar 22, 2022, at 9:18 AM, James Hupy wrote:
>
> Don't know why there is so many boots failing. I still have the outer ones
> on my 78 Royale that I put on when I first got my coach back in September
> 2008. It still has the OEM inner boots from the factory. I have put many,
> many thousands of miles on the coach.
> I have installed many outer boots on OEM and 1 Ton front ends, with
> few come backs. Ken Thoma showed me his technique, which I have always
> used. It uses a clamp system called "Band-it" which uses continous 1/4"
> wide stainless steel band material and small clips that are closed with a
> special proprietary tool. I only band the large end of the boots, and use
> zip ties on the small end. Only tighten the zip tie enough so that it will
> just slip on the axle and not hold the boot immobile. That way the boot
> does not twist and untwist in use.
> Jim Hupy
> Salem, Oregon
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Rob -
Victoria, BC -
76 Royale - Rear Twins/Dry Bath
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| Re: [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369230 is a reply to message #369213] |
Wed, 23 March 2022 16:01 |
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Richard RV
Messages: 631
Registered: July 2012
Location: Full-timer for 12 years, ...
Karma: -17
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Rob wrote on Tue, 22 March 2022 13:45I had to replace both of my 1-Ton front end's (installed by Jim Hupy just before I bought the coach) outer boots - I think it was a combination of the early hex head bolts (later versions had smooth carriage bolts?) and soft CV boot material (later ones were more "firm"?). They were both torn with relatively few miles. Not a horrible job replacing them on a 1-Ton - but it seemed like the getting the angles just right was key to the process. Dave Jarvis helped with the first one - and I did the other one the following season.
I left the hex head bolts installed and used some different boots that came from Manny. I may have carriage bolts from Manny as well - but figured "why mess with it?", if things are OK with the new boots. I've got many thousands of miles on the second set of boots.
Rob,
I'm not following you...maybe we're not talking about the same thing? I was asking if anyone was able to release the shaft from the outer CV joint and replace the outer boot without disturbing the 6 12-point output shaft bolts or the big axle nut at the hub.
I'm not familiar with the carriage bolts you mentioned, where do they go? Mine wasn't a kit so maybe that's the difference?
Jim,
I've heard the suggestion to not tightly band the small ends of the CV boots, but I don't think twisting is what's causing boot failure. There's not much slop between the CV ball bearings and the bell housings unless there's a lot of wear. The twisting couldn't be more than 1° or 2° while the flexure from suspension travel is multiples of that. In either situation a looser small band would allow the boot to move to minimize stress, and not a bad idea. Still think it's just crappy rubber causing the problem!
All,
Has anyone tried Bob Drewes technique for releasing the outer CV joint to replace the boot? If not, I'm kind of shocked. When I first got into the GMC world I spoke to all of the GMC gurus, and whenever they didn't have an answer I'd almost always hear, "Ask Bob Drewes." Please chime in if you tried Bob's technique and let me know if it was successful or not.
I know of one other person who tried Bob's technique without success. After I removed my 1 ton axle assembly and found the axle wouldn't budge after the snap ring was released, Ernie suggested a come-along to pull the axle shaft out of the outer CV. After replacing badly worn inner CVs on both 1 ton half shafts, and running out of curses, I'm of the opinion 1 ton store bought axles have so much variance in all of their parts that the specifications are only really suggestions. More on this later.
Richard
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
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| [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369232 is a reply to message #369230] |
Wed, 23 March 2022 17:14 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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The 1 ton is not assembled like the OEM front end. The outer CV joint
spline joint is an interference pressed fit. No clip. There is a spreader
tool, that Manny T. uses to install the boots without disassembling the
joint. It spreads open the shaft end boot large enough to fit over the
large outer end of the CV. To get to the boot, you need to remove the
caliper fasteners, remove the caliper and hang it so that it does not
stretch the brake hose. Then, take that big nut off the axle along with the
washer, and remove the rotor. That will give you access to the outer CV and
boot. If you cannot get the axle assembly free from the hub, then
disassemble the upper ball joint and that should give you enough space to
access the axle. I find it just about the same amount of work to just
remove the axle nut and washer, and the inboard CV flange bolts, remove the
axle and work on it in the bench. Any questions, PM me or call me.
Jim Hupy
Salem, Oregon
On Wed, Mar 23, 2022, 2:01 PM Richard wrote:
> Rob wrote on Tue, 22 March 2022 13:45
>> I had to replace both of my 1-Ton front end's (installed by Jim Hupy
> just before I bought the coach) outer boots - I think it was a combination
> of
>> the early hex head bolts (later versions had smooth carriage bolts?) and
> soft CV boot material (later ones were more "firm"?). They were both torn
>> with relatively few miles. Not a horrible job replacing them on a 1-Ton
> - but it seemed like the getting the angles just right was key to the
>> process. Dave Jarvis helped with the first one - and I did the other one
> the following season.
>>
>> I left the hex head bolts installed and used some different boots that
> came from Manny. I may have carriage bolts from Manny as well - but figured
>> "why mess with it?", if things are OK with the new boots. I've got many
> thousands of miles on the second set of boots.
>
> Rob,
> I'm not following you...maybe we're not talking about the same thing? I
> was asking if anyone was able to release the shaft from the outer CV joint
> and replace the outer boot without disturbing the 6 12-point output shaft
> bolts or the big axle nut at the hub.
>
> I'm not familiar with the carriage bolts you mentioned, where do they go?
> Mine wasn't a kit so maybe that's the difference?
>
> Jim,
> I've heard the suggestion to not tightly band the small ends of the CV
> boots, but I don't think twisting is what's causing boot failure. There's
> not
> much slop between the CV ball bearings and the bell housings unless
> there's a lot of wear. The twisting couldn't be more than 1° or 2° while
> the
> flexure from suspension travel is multiples of that. In either situation
> a looser small band would allow the boot to move to minimize stress, and not
> a bad idea. Still think it's just crappy rubber causing the problem!
>
> All,
> Has anyone tried Bob Drewes technique for releasing the outer CV joint to
> replace the boot? If not, I'm kind of shocked. When I first got into the
> GMC world I spoke to all of the GMC gurus, and whenever they didn't have
> an answer I'd almost always hear, "Ask Bob Drewes." Please chime in if you
> tried Bob's technique and let me know if it was successful or not.
>
> I know of one other person who tried Bob's technique without success.
> After I removed my 1 ton axle assembly and found the axle wouldn't budge
> after
> the snap ring was released, Ernie suggested a come-along to pull the axle
> shaft out of the outer CV. After replacing badly worn inner CVs on both 1
> ton half shafts, and running out of curses, I'm of the opinion 1 ton store
> bought axles have so much variance in all of their parts that the
> specifications are only really suggestions. More on this later.
>
> Richard
> --
> '77 Birchaven TZE...777;
> '76 Palm Beach under construction;
> ‘76 Edgemonte waiting its turn
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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| [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369233 is a reply to message #369205] |
Wed, 23 March 2022 17:18 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Oh yes, if I have complete axle assemblies in stock, I usually just swap
whole assemblies rather than screwing around trying to disassemble those
interference fit buggers. But, most of you do not have that luxury, I know.
Jim Hupy
Salem, Oregon
On Wed, Mar 23, 2022, 3:14 PM James Hupy wrote:
> The 1 ton is not assembled like the OEM front end. The outer CV joint
> spline joint is an interference pressed fit. No clip. There is a spreader
> tool, that Manny T. uses to install the boots without disassembling the
> joint. It spreads open the shaft end boot large enough to fit over the
> large outer end of the CV. To get to the boot, you need to remove the
> caliper fasteners, remove the caliper and hang it so that it does not
> stretch the brake hose. Then, take that big nut off the axle along with the
> washer, and remove the rotor. That will give you access to the outer CV and
> boot. If you cannot get the axle assembly free from the hub, then
> disassemble the upper ball joint and that should give you enough space to
> access the axle. I find it just about the same amount of work to just
> remove the axle nut and washer, and the inboard CV flange bolts, remove the
> axle and work on it in the bench. Any questions, PM me or call me.
> Jim Hupy
> Salem, Oregon
>
> On Wed, Mar 23, 2022, 2:01 PM Richard wrote:
>
>> Rob wrote on Tue, 22 March 2022 13:45
>>> I had to replace both of my 1-Ton front end's (installed by Jim Hupy
>> just before I bought the coach) outer boots - I think it was a combination
>> of
>>> the early hex head bolts (later versions had smooth carriage bolts?)
>> and soft CV boot material (later ones were more "firm"?). They were both
>> torn
>>> with relatively few miles. Not a horrible job replacing them on a 1-Ton
>> - but it seemed like the getting the angles just right was key to the
>>> process. Dave Jarvis helped with the first one - and I did the other
>> one the following season.
>>>
>>> I left the hex head bolts installed and used some different boots that
>> came from Manny. I may have carriage bolts from Manny as well - but figured
>>> "why mess with it?", if things are OK with the new boots. I've got many
>> thousands of miles on the second set of boots.
>>
>> Rob,
>> I'm not following you...maybe we're not talking about the same thing? I
>> was asking if anyone was able to release the shaft from the outer CV joint
>> and replace the outer boot without disturbing the 6 12-point output shaft
>> bolts or the big axle nut at the hub.
>>
>> I'm not familiar with the carriage bolts you mentioned, where do they
>> go? Mine wasn't a kit so maybe that's the difference?
>>
>> Jim,
>> I've heard the suggestion to not tightly band the small ends of the CV
>> boots, but I don't think twisting is what's causing boot failure. There's
>> not
>> much slop between the CV ball bearings and the bell housings unless
>> there's a lot of wear. The twisting couldn't be more than 1° or 2° while
>> the
>> flexure from suspension travel is multiples of that. In either situation
>> a looser small band would allow the boot to move to minimize stress, and not
>> a bad idea. Still think it's just crappy rubber causing the problem!
>>
>> All,
>> Has anyone tried Bob Drewes technique for releasing the outer CV joint to
>> replace the boot? If not, I'm kind of shocked. When I first got into the
>> GMC world I spoke to all of the GMC gurus, and whenever they didn't have
>> an answer I'd almost always hear, "Ask Bob Drewes." Please chime in if you
>> tried Bob's technique and let me know if it was successful or not.
>>
>> I know of one other person who tried Bob's technique without success.
>> After I removed my 1 ton axle assembly and found the axle wouldn't budge
>> after
>> the snap ring was released, Ernie suggested a come-along to pull the axle
>> shaft out of the outer CV. After replacing badly worn inner CVs on both 1
>> ton half shafts, and running out of curses, I'm of the opinion 1 ton
>> store bought axles have so much variance in all of their parts that the
>> specifications are only really suggestions. More on this later.
>>
>> Richard
>> --
>> '77 Birchaven TZE...777;
>> '76 Palm Beach under construction;
>> ‘76 Edgemonte waiting its turn
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
>
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| Re: [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369239 is a reply to message #369232] |
Thu, 24 March 2022 08:24 |
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Richard RV
Messages: 631
Registered: July 2012
Location: Full-timer for 12 years, ...
Karma: -17
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James Hupy wrote on Wed, 23 March 2022 18:14The 1 ton is not assembled like the OEM front end. The outer CV joint
spline joint is an interference pressed fit. No clip.
Jim,
My original 1 ton half shafts came from Manny and they had the snap rings on the outer CVs. I bought two 1 ton half shafts to swap over the GMC axles and use the new CVs. IIRC one came from AutoZone and the other from Carquest - both of those had snap rings.
The Manny half shafts had about 50K miles on them and I was shocked by the amount of wear on the inner CV bearing races. One side was bad, the other was much worse. I'm not sure what the life/mileage expectancy is for CVs in a GMC, maybe I did good getting 50K...? Boots had some cracking but weren't compromised.
Richard
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
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| [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369240 is a reply to message #369239] |
Thu, 24 March 2022 10:16 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Hmmmm? Differences in 1 Ton axles and CV joints. Why does that not surprise
me? Well, Bill Hubler, from Idaho developed the 1 Ton front end. And
he installed a bunch of them, using the stock GMC axles and CV joints and
mating them to salvage yard Chev and GMC Truck and Suburban hubs and
brakes. Those pieces were scrounged far and wide all over the place. The
splines on the outboard CV joint were "close" to the Chev and GMC hubs, but
not quite an exact match.
Time passes, and Bill, who runs a crop dusting business as well as an
aircraft upfitting business, wanted to quit making the 1 Ton front ends. As
Bill and Manny were both GMCWS members, one thing led to another, and Manny
took over the 1 Ton business.
Manny grew tired of trying to scrounge wrecking yards for his pieces,
so he had a supplier make him 100 sets of axle assemblies. You got any
concept of how much space that many pieces and parts takes up? A whole
bunch. Several buildings at Mannys place on the side hill overlooking San
Jose, California were taken up with them. Manny's business was primarily
transmission related, and much of his shop is dedicated to rebuilding
transmissions. He does them 3 at a time. And he lays all the parts out
before he starts the process. I have been to Manny's place several times
and when he is doing transmissions, it is not the best time to interrupt
him. He is an incredible person, and his wife Deo is our travel agent. So
we have fairly frequent contact with them both. Manny fronts 1 Ton systems
into my shop, and perhaps others as well. When I have a coach that needs a
transmission, I have him ship one to my installer, Sam's transmission in
Salem, Oregon. Sam usually gives me a 2 day turn around on those deals.
So, does it surprise me if there are differences in this stuff? Not
one bit. But, 50,000 miles is a bunch. But not for the inner CV's without
torn boots. They should go a very long time. Outers?? Probably don't last
as long because of the turning left and right. But quality control is all
over the map on replacement parts. Auto Zone, O'Reilly, and others source
these things all over the planet. Is there some differences in pieces? You
bet your sweet bippy, to quote Laugh In. You do remember Laugh In, don't
you?
Jim Hupy
Salem, Oregon
On Thu, Mar 24, 2022, 6:25 AM Richard wrote:
> James Hupy wrote on Wed, 23 March 2022 18:14
>> The 1 ton is not assembled like the OEM front end. The outer CV joint
>> spline joint is an interference pressed fit. No clip.
>
> Jim,
> My original 1 ton half shafts came from Manny and they had the snap rings
> on the outer CVs. I bought two 1 ton half shafts to swap over the GMC axles
> and use the new CVs. IIRC one came from AutoZone and the other from
> Carquest - both of those had snap rings.
>
> The Manny half shafts had about 50K miles on them and I was shocked by the
> amount of wear on the inner CV bearing races. One side was bad, the other
> was much worse. I'm not sure what the life/mileage expectancy is for CVs
> in a GMC, maybe I did good getting 50K...? Boots had some cracking but
> weren't compromised.
>
> Richard
> --
> '77 Birchaven TZE...777;
> '76 Palm Beach under construction;
> ‘76 Edgemonte waiting its turn
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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| [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369241 is a reply to message #369240] |
Thu, 24 March 2022 10:42 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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The”new” drive shafts you received could have been reconditioned or rebuilt
shafts. Which are dismantled, cleaned, re greased and then assembled with
new boots. If you bought them at an auto parts chain.
Sully
Bellevue wa.
On Thu, Mar 24, 2022 at 8:17 AM James Hupy wrote:
> Hmmmm? Differences in 1 Ton axles and CV joints. Why does that not surprise
> me? Well, Bill Hubler, from Idaho developed the 1 Ton front end. And
> he installed a bunch of them, using the stock GMC axles and CV joints and
> mating them to salvage yard Chev and GMC Truck and Suburban hubs and
> brakes. Those pieces were scrounged far and wide all over the place. The
> splines on the outboard CV joint were "close" to the Chev and GMC hubs, but
> not quite an exact match.
> Time passes, and Bill, who runs a crop dusting business as well as an
> aircraft upfitting business, wanted to quit making the 1 Ton front ends. As
> Bill and Manny were both GMCWS members, one thing led to another, and Manny
> took over the 1 Ton business.
> Manny grew tired of trying to scrounge wrecking yards for his pieces,
> so he had a supplier make him 100 sets of axle assemblies. You got any
> concept of how much space that many pieces and parts takes up? A whole
> bunch. Several buildings at Mannys place on the side hill overlooking San
> Jose, California were taken up with them. Manny's business was primarily
> transmission related, and much of his shop is dedicated to rebuilding
> transmissions. He does them 3 at a time. And he lays all the parts out
> before he starts the process. I have been to Manny's place several times
> and when he is doing transmissions, it is not the best time to interrupt
> him. He is an incredible person, and his wife Deo is our travel agent. So
> we have fairly frequent contact with them both. Manny fronts 1 Ton systems
> into my shop, and perhaps others as well. When I have a coach that needs a
> transmission, I have him ship one to my installer, Sam's transmission in
> Salem, Oregon. Sam usually gives me a 2 day turn around on those deals.
> So, does it surprise me if there are differences in this stuff? Not
> one bit. But, 50,000 miles is a bunch. But not for the inner CV's without
> torn boots. They should go a very long time. Outers?? Probably don't last
> as long because of the turning left and right. But quality control is all
> over the map on replacement parts. Auto Zone, O'Reilly, and others source
> these things all over the planet. Is there some differences in pieces? You
> bet your sweet bippy, to quote Laugh In. You do remember Laugh In, don't
> you?
> Jim Hupy
> Salem, Oregon
>
> On Thu, Mar 24, 2022, 6:25 AM Richard wrote:
>
>> James Hupy wrote on Wed, 23 March 2022 18:14
>>> The 1 ton is not assembled like the OEM front end. The outer CV joint
>>> spline joint is an interference pressed fit. No clip.
>>
>> Jim,
>> My original 1 ton half shafts came from Manny and they had the snap rings
>> on the outer CVs. I bought two 1 ton half shafts to swap over the GMC
> axles
>> and use the new CVs. IIRC one came from AutoZone and the other from
>> Carquest - both of those had snap rings.
>>
>> The Manny half shafts had about 50K miles on them and I was shocked by
> the
>> amount of wear on the inner CV bearing races. One side was bad, the
> other
>> was much worse. I'm not sure what the life/mileage expectancy is for CVs
>> in a GMC, maybe I did good getting 50K...? Boots had some cracking but
>> weren't compromised.
>>
>> Richard
>> --
>> '77 Birchaven TZE...777;
>> '76 Palm Beach under construction;
>> ‘76 Edgemonte waiting its turn
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369242 is a reply to message #369230] |
Thu, 24 March 2022 12:11 |
Rob
Messages: 651
Registered: November 2013
Location: Victoria, BC
Karma: 3
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Senior Member |
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My reply was to add a data point about outer boots failing, from Jim's post: "Don't know why there is so many boots failing".
In my case - the boots failed from expanding while rotating and scraping on the hex head bolts on the lower A arm (directly under the outer boot). At the time - Manny mentioned that the hex head bolts had been changed in later designs (and sent the replacement bolts).
I then continued by suggesting that removing the entire shaft was how I did it - I'm not sure I could have done the way you are describing. It seemed to me that pulling the shaft and dealing with out away from the vehicle would yield less stress, but your mileage may vary. The biggest downside to pulling it (IMO) would be replacing the "one time use" inner bolts - but they are easier to source for those in the USA.
But I didn't mean to confuse things further!
Rob
76 Royale Twin Beds, Dry Bath
Victoria, BC
> On Mar 23, 2022, at 2:01 PM, Richard wrote:
>
> Rob wrote on Tue, 22 March 2022 13:45
>> I had to replace both of my 1-Ton front end's (installed by Jim Hupy just before I bought the coach) outer boots - I think it was a combination of
>> the early hex head bolts (later versions had smooth carriage bolts?) and soft CV boot material (later ones were more "firm"?). They were both torn
>> with relatively few miles. Not a horrible job replacing them on a 1-Ton - but it seemed like the getting the angles just right was key to the
>> process. Dave Jarvis helped with the first one - and I did the other one the following season.
>>
>> I left the hex head bolts installed and used some different boots that came from Manny. I may have carriage bolts from Manny as well - but figured
>> "why mess with it?", if things are OK with the new boots. I've got many thousands of miles on the second set of boots.
>
> Rob,
> I'm not following you...maybe we're not talking about the same thing? I was asking if anyone was able to release the shaft from the outer CV joint
> and replace the outer boot without disturbing the 6 12-point output shaft bolts or the big axle nut at the hub.
>
> I'm not familiar with the carriage bolts you mentioned, where do they go? Mine wasn't a kit so maybe that's the difference?
>
> ...
>
> All,
> Has anyone tried Bob Drewes technique for releasing the outer CV joint to replace the boot? If not, I'm kind of shocked. When I first got into the
> GMC world I spoke to all of the GMC gurus, and whenever they didn't have an answer I'd almost always hear, "Ask Bob Drewes." Please chime in if you
> tried Bob's technique and let me know if it was successful or not.
>
> I know of one other person who tried Bob's technique without success. After I removed my 1 ton axle assembly and found the axle wouldn't budge after
> the snap ring was released, Ernie suggested a come-along to pull the axle shaft out of the outer CV. After replacing badly worn inner CVs on both 1
> ton half shafts, and running out of curses, I'm of the opinion 1 ton store bought axles have so much variance in all of their parts that the
> specifications are only really suggestions. More on this later.
>
> Richard
> --
> '77 Birchaven TZE...777;
> '76 Palm Beach under construction;
> ‘76 Edgemonte waiting its turn
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Rob -
Victoria, BC -
76 Royale - Rear Twins/Dry Bath
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