Home » Public Forums » GMCnet » [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT.
| [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332288] |
Sat, 19 May 2018 00:24  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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I'm getting a crash course on 73 GMC's. Just not up to the details on them. I have two choices for this 73. One. Service the wheel bearings brakes and the suspension components that are on the 73 now. Two. Put the 78 rear suspension under the 73. Then all that work that had been done by me a few years ago when it was under the soon to burn 78. Then this could be a good upgrade for the 73 when I sell it. Plus in reality. It's just simpler to switch the 78 to the 73. And avoid the rebuilding the 73. Installing 77 gas tanks that have the larger gas fill pipe. And since the fill pipe is out. I can install a fuel return gas line fitting for the Howell EFI. This 73 is going to be a nice GMC. Bob Dunahugh
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332289 is a reply to message #332288] |
Sat, 19 May 2018 06:17  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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What a glutton for punishment!
Ken H.
On Sat, May 19, 2018 at 1:25 AM Bob Dunahugh wrote:
> I'm getting a crash course on 73 GMC's. Just not up to the details on
> them. I have two choices for this 73. One. Service the wheel bearings
> brakes and the suspension components that are on the 73 now. Two. Put the
> 78 rear suspension under the 73. Then all that work that had been done by
> me a few years ago when it was under the soon to burn 78. Then this could
> be a good upgrade for the 73 when I sell it. Plus in reality. It's just
> simpler to switch the 78 to the 73. And avoid the rebuilding the 73.
> Installing 77 gas tanks that have the larger gas fill pipe. And since the
> fill pipe is out. I can install a fuel return gas line fitting for the
> Howell EFI. This 73 is going to be a nice GMC. Bob Dunahugh
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332379 is a reply to message #332289] |
Mon, 21 May 2018 16:11 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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ken, are you saying there is a lot of difference between the 2 years?
I know the rear GVW increased between the years but did the parts really
change?
On Sat, May 19, 2018 at 4:17 AM, Ken Henderson
wrote:
> What a glutton for punishment!
>
> Ken H.
>
> On Sat, May 19, 2018 at 1:25 AM Bob Dunahugh wrote:
>
>> I'm getting a crash course on 73 GMC's. Just not up to the details on
>> them. I have two choices for this 73. One. Service the wheel bearings
>> brakes and the suspension components that are on the 73 now. Two. Put
> the
>> 78 rear suspension under the 73. Then all that work that had been done
> by
>> me a few years ago when it was under the soon to burn 78. Then this
> could
>> be a good upgrade for the 73 when I sell it. Plus in reality. It's just
>> simpler to switch the 78 to the 73. And avoid the rebuilding the 73.
>> Installing 77 gas tanks that have the larger gas fill pipe. And since the
>> fill pipe is out. I can install a fuel return gas line fitting for the
>> Howell EFI. This 73 is going to be a nice GMC. Bob Dunahugh
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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*John Phillips*
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John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332381 is a reply to message #332379] |
Mon, 21 May 2018 16:45 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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John,
I was just ribbing Bob about the amount of work he's putting into that '73
-- someone's going to get a jewel!
As for the bogies, I suspect they're directly interchangeable. As far as I
know, the spindles and the swing arm pins (and related parts) are the only
differences. Even the spindles should be the same if the '73 had the
recall performed which replaced them. Even if there are other differences,
I doubt they'd be as difficult to correct as it would be to rebuild the '73
bogie. I strongly suspect that not only the pin bushings, but the bogie
housings around those bushings, are badly worn, requiring difficult (and
expensive) machine work to restore the housing.
Ken H.
On Mon, May 21, 2018 at 5:12 PM John Phillips
wrote:
> ken, are you saying there is a lot of difference between the 2 years?
> I know the rear GVW increased between the years but did the parts really
> change?
>
> On Sat, May 19, 2018 at 4:17 AM, Ken Henderson
> wrote:
>
>> What a glutton for punishment!
>>
>> Ken H.
>>
>
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www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332382 is a reply to message #332381] |
Mon, 21 May 2018 17:14 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I just did a early to late conversion this winter. The bogie boxes are
different, as well as the bogie arms. The spindles, after the recall, are
the same. Better to find a late coach and swap the assemblies. If you do a
total rebuild, it is a whole bunch of work. Pressing out the top hat thrust
bushings will improve your vocabulary skills, as will removing the bogie
arm bushings, as the arms are step bored, and cannot be pressed through the
assembly. I used a die grinder, ground the bushings paper thin, and an
expanding collet slide hammer to remove them. Oh, yeah, I learned some new
vocabulary along the way. Reaming the semifinished pin bushings is a lot of
work if you don't have a mill. I do them by hand with a critchley expansion
reamer. A good winter shop project.
Jim Hupy
On May 21, 2018 2:46 PM, "Ken Henderson" wrote:
John,
I was just ribbing Bob about the amount of work he's putting into that '73
-- someone's going to get a jewel!
As for the bogies, I suspect they're directly interchangeable. As far as I
know, the spindles and the swing arm pins (and related parts) are the only
differences. Even the spindles should be the same if the '73 had the
recall performed which replaced them. Even if there are other differences,
I doubt they'd be as difficult to correct as it would be to rebuild the '73
bogie. I strongly suspect that not only the pin bushings, but the bogie
housings around those bushings, are badly worn, requiring difficult (and
expensive) machine work to restore the housing.
Ken H.
On Mon, May 21, 2018 at 5:12 PM John Phillips
wrote:
> ken, are you saying there is a lot of difference between the 2 years?
> I know the rear GVW increased between the years but did the parts really
> change?
>
> On Sat, May 19, 2018 at 4:17 AM, Ken Henderson
> wrote:
>
>> What a glutton for punishment!
>>
>> Ken H.
>>
>
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332391 is a reply to message #332382] |
Mon, 21 May 2018 20:02 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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Senior Member |
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Thank you Ken and James,
I thought there was a possibility that my 74 vintage bogies could be safe
at the GVW of the newer coaches.
On Mon, May 21, 2018 at 3:14 PM, James Hupy wrote:
> I just did a early to late conversion this winter. The bogie boxes are
> different, as well as the bogie arms. The spindles, after the recall, are
> the same. Better to find a late coach and swap the assemblies. If you do a
> total rebuild, it is a whole bunch of work. Pressing out the top hat thrust
> bushings will improve your vocabulary skills, as will removing the bogie
> arm bushings, as the arms are step bored, and cannot be pressed through the
> assembly. I used a die grinder, ground the bushings paper thin, and an
> expanding collet slide hammer to remove them. Oh, yeah, I learned some new
> vocabulary along the way. Reaming the semifinished pin bushings is a lot of
> work if you don't have a mill. I do them by hand with a critchley expansion
> reamer. A good winter shop project.
> Jim Hupy
>
> On May 21, 2018 2:46 PM, "Ken Henderson" wrote:
>
> John,
>
> I was just ribbing Bob about the amount of work he's putting into that '73
> -- someone's going to get a jewel!
>
> As for the bogies, I suspect they're directly interchangeable. As far as I
> know, the spindles and the swing arm pins (and related parts) are the only
> differences. Even the spindles should be the same if the '73 had the
> recall performed which replaced them. Even if there are other differences,
> I doubt they'd be as difficult to correct as it would be to rebuild the '73
> bogie. I strongly suspect that not only the pin bushings, but the bogie
> housings around those bushings, are badly worn, requiring difficult (and
> expensive) machine work to restore the housing.
>
> Ken H.
>
> On Mon, May 21, 2018 at 5:12 PM John Phillips
> wrote:
>
>
>> ken, are you saying there is a lot of difference between the 2 years?
>> I know the rear GVW increased between the years but did the parts really
>> change?
>>
>> On Sat, May 19, 2018 at 4:17 AM, Ken Henderson
>> wrote:
>>
>>> What a glutton for punishment!
>>>
>>> Ken H.
>>>
>>
> _______________________________________________
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--
*John Phillips*
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John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332405 is a reply to message #332381] |
Tue, 22 May 2018 11:12 |
 |
Cesar Carrasco
Messages: 30
Registered: September 2017
Location: Riverside, California
Karma: 0
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Is there a way to tell if the bogie recall was performed?
On Mon, May 21, 2018 at 2:45 PM, Ken Henderson
wrote:
> John,
>
> I was just ribbing Bob about the amount of work he's putting into that '73
> -- someone's going to get a jewel!
>
> As for the bogies, I suspect they're directly interchangeable. As far as I
> know, the spindles and the swing arm pins (and related parts) are the only
> differences. Even the spindles should be the same if the '73 had the
> recall performed which replaced them. Even if there are other differences,
> I doubt they'd be as difficult to correct as it would be to rebuild the '73
> bogie. I strongly suspect that not only the pin bushings, but the bogie
> housings around those bushings, are badly worn, requiring difficult (and
> expensive) machine work to restore the housing.
>
> Ken H.
>
> On Mon, May 21, 2018 at 5:12 PM John Phillips
> wrote:
>
>> ken, are you saying there is a lot of difference between the 2 years?
>> I know the rear GVW increased between the years but did the parts really
>> change?
>>
>> On Sat, May 19, 2018 at 4:17 AM, Ken Henderson
>> wrote:
>>
>>> What a glutton for punishment!
>>>
>>> Ken H.
>>>
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332406 is a reply to message #332382] |
Tue, 22 May 2018 11:52 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Hey, Jim,
I just discovered the easy way to remove the suspension arm bushings from
those stepped bores: Just go to your tool cabinet and get out a 1-1/4" or
1-1/2" tap and screw it into the bushing a few turns, then drive the
combination out with a brass drift (with gentle taps)! 'Least that's how
Service Bulletin 75-TM-4 says to do it! :-)
Yeah, me too -- don't have taps anywhere near that big! I used a tail pipe
cutter chisel to remove them when I did mine in '98.
Ken H.
On Mon, May 21, 2018 at 6:15 PM James Hupy wrote:
> ...
> Pressing out the top hat thrust
> bushings will improve your vocabulary skills, as will removing the bogie
> arm bushings, as the arms are step bored, and cannot be pressed through the
> assembly. I used a die grinder, ground the bushings paper thin, and an
> expanding collet slide hammer to remove them.
...
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332407 is a reply to message #332406] |
Tue, 22 May 2018 12:08 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Many different minds attacking the same problem make easy work of any
problem. I will try your method if there is a "next time " for those
bushings. Thanks.
Jim Hupy
On Tue, May 22, 2018, 9:53 AM Ken Henderson wrote:
> Hey, Jim,
> I just discovered the easy way to remove the suspension arm bushings from
> those stepped bores: Just go to your tool cabinet and get out a 1-1/4" or
> 1-1/2" tap and screw it into the bushing a few turns, then drive the
> combination out with a brass drift (with gentle taps)! 'Least that's how
> Service Bulletin 75-TM-4 says to do it! :-)
>
> Yeah, me too -- don't have taps anywhere near that big! I used a tail pipe
> cutter chisel to remove them when I did mine in '98.
>
> Ken H.
>
> On Mon, May 21, 2018 at 6:15 PM James Hupy wrote:
>
>> ...
>> Pressing out the top hat thrust
>> bushings will improve your vocabulary skills, as will removing the bogie
>> arm bushings, as the arms are step bored, and cannot be pressed through
> the
>> assembly. I used a die grinder, ground the bushings paper thin, and an
>> expanding collet slide hammer to remove them.
>
> ...
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332409 is a reply to message #332406] |
Tue, 22 May 2018 12:39 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Just a WAG (Wild Arse Guess) here, but wouldn't the cost of one of those big taps from horror fright be worth it to do the job so easily????
AND, you could loan it out to other GMCers who needed to do the same job!
D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com
________________________________
From: Gmclist on behalf of Ken Henderson
Sent: Tuesday, May 22, 2018 11:52
To: GMC Mail List
Subject: Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT.
Hey, Jim,
I just discovered the easy way to remove the suspension arm bushings from
those stepped bores: Just go to your tool cabinet and get out a 1-1/4" or
1-1/2" tap and screw it into the bushing a few turns, then drive the
combination out with a brass drift (with gentle taps)! 'Least that's how
Service Bulletin 75-TM-4 says to do it! :-)
Yeah, me too -- don't have taps anywhere near that big! I used a tail pipe
cutter chisel to remove them when I did mine in '98.
Ken H.
On Mon, May 21, 2018 at 6:15 PM James Hupy wrote:
> ...
> Pressing out the top hat thrust
> bushings will improve your vocabulary skills, as will removing the bogie
> arm bushings, as the arms are step bored, and cannot be pressed through the
> assembly. I used a die grinder, ground the bushings paper thin, and an
> expanding collet slide hammer to remove them.
...
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332410 is a reply to message #332408] |
Tue, 22 May 2018 12:56 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Cesar & Ken
Read here about how to determine if the spindle recall has been completed.
I won't summarize as it may lose correctness.
http://www.gmcmotorhome.info/rear.html#RECALL
Dennis
Ken Henderson wrote on Tue, 22 May 2018 12:14 Cesar,
I just read the Service Bulletin under which the spindles were replaced.
The only marking mentioned was a sticker which should have been applied
beside the Vehicle Identification Label (VIN plate under the right hood).
I wouldn't depend on it still being there. Unless someone knows of another
way, I guess pulling a wheel to check the spindle size is required.
Ken "Glad mine's a '76" H.
On Tue, May 22, 2018 at 12:13 PM Cesar Carrasco
wrote:
> Is there a way to tell if the bogie recall was performed?
>
>
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332411 is a reply to message #332406] |
Tue, 22 May 2018 13:00 |
Emery Stora
Messages: 959
Registered: January 2011
Karma: 4
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Senior Member |
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Pipe taps should work just as well. Some of us have pipe threading tools that are larger.
Emery Stora
77 Kingsley
Frederick, CO
> On May 22, 2018, at 10:52 AM, Ken Henderson wrote:
>
> Hey, Jim,
> I just discovered the easy way to remove the suspension arm bushings from
> those stepped bores: Just go to your tool cabinet and get out a 1-1/4" or
> 1-1/2" tap and screw it into the bushing a few turns, then drive the
> combination out with a brass drift (with gentle taps)! 'Least that's how
> Service Bulletin 75-TM-4 says to do it! :-)
>
> Yeah, me too -- don't have taps anywhere near that big! I used a tail pipe
> cutter chisel to remove them when I did mine in '98.
>
> Ken H.
>
> On Mon, May 21, 2018 at 6:15 PM James Hupy wrote:
>
>> ...
>> Pressing out the top hat thrust
>> bushings will improve your vocabulary skills, as will removing the bogie
>> arm bushings, as the arms are step bored, and cannot be pressed through the
>> assembly. I used a die grinder, ground the bushings paper thin, and an
>> expanding collet slide hammer to remove them.
>
> ...
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332413 is a reply to message #332410] |
Tue, 22 May 2018 13:25 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Thanks, Dennis,
I've got a spare hub, which should be for a 1-1/2" spindle; I'll check it
for 8 notches later today.
Ken H.
On Tue, May 22, 2018 at 1:57 PM Dennis Sexton wrote:
> Cesar & Ken
>
> Read here about how to determine if the spindle recall has been completed.
> I won't summarize as it may lose correctness.
>
> http://www.gmcmotorhome.info/rear.html#RECALL
>
> Dennis
>
>
>
> Ken Henderson wrote on Tue, 22 May 2018 12:14
>> Cesar,
>>
>> I just read the Service Bulletin under which the spindles were replaced.
>> The only marking mentioned was a sticker which should have been applied
>> beside the Vehicle Identification Label (VIN plate under the right hood).
>> I wouldn't depend on it still being there. Unless someone knows of
> another
>> way, I guess pulling a wheel to check the spindle size is required.
>>
>> Ken "Glad mine's a '76" H.
>>
>> On Tue, May 22, 2018 at 12:13 PM Cesar Carrasco
>> wrote:
>>
>>> Is there a way to tell if the bogie recall was performed?
>>>
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> --
> Dennis S
> 73 Painted Desert 230
> Memphis TN Metro
>
> _______________________________________________
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332414 is a reply to message #332409] |
Tue, 22 May 2018 13:36 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
|
Senior Member |
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Mac,
I couldn't find a tap that large on HF, but Amazon lists some for about
$35. If I ever do that job again (unlikely), I'll ping my plumber buddy
for one of his. (Or Emery.) :-)
Ken H.
On Tue, May 22, 2018 at 1:40 PM D C _Mac_ Macdonald
wrote:
> Just a WAG (Wild Arse Guess) here, but wouldn't the cost of one of those
> big taps from horror fright be worth it to do the job so easily????
>
> AND, you could loan it out to other GMCers who needed to do the same job!
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332415 is a reply to message #332414] |
Tue, 22 May 2018 13:44 |
bdub
Messages: 1578
Registered: February 2004
Location: Central Texas
Karma: 5
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Senior Member |
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Local pawn shop should be a good source for a cheap 1-1/4" pipe tap.
On Tue, May 22, 2018 at 1:36 PM, Ken Henderson
wrote:
> Mac,
>
> I couldn't find a tap that large on HF, but Amazon lists some for about
> $35. If I ever do that job again (unlikely), I'll ping my plumber buddy
> for one of his. (Or Emery.) :-)
>
> Ken H.
>
>
> On Tue, May 22, 2018 at 1:40 PM D C _Mac_ Macdonald
> wrote:
>
>> Just a WAG (Wild Arse Guess) here, but wouldn't the cost of one of those
>> big taps from horror fright be worth it to do the job so easily????
>>
>> AND, you could loan it out to other GMCers who needed to do the same job!
>>
>>
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bdub
'76 Palm Beach/Central Texas
www.bdub.net
www.gmcmhphotos.com
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www.gmcmhregistry.com
www.facebook.com/groups/classicgmcmotorhomes
www.facebook.com/groups/gmcmm
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| Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT. [message #332462 is a reply to message #332456] |
Wed, 23 May 2018 16:05 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Cesar23ftr73 wrote on Wed, 23 May 2018 15:19I checked both my 73 and 74 and both have the 8 notches on the hub centering shoulder. When I have more time I'll check the spindle size. I did not see a sticker next to VIN plates.
Thanks again for the info!
Cesar,
It sounds like you lucked out on that one.
Mine has the update and no sticker.
CAUTION: If you go to buy rear brake shoes, the listings are often wrong for the updated brakes.
You want the later version shoes.
Again a small caution about the 73-23.
Don't count on good information from the X7525 book or set.
You have to collect the X7425 manuals from Bdub's link site.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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