Home » Public Forums » GMCnet » [GMCnet] WARNING about changing anything that is involved with the transmission shift linkage. Or just age.
| [GMCnet] WARNING about changing anything that is involved with the transmission shift linkage. Or just age. [message #330412] |
Tue, 27 March 2018 11:44  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Two years ago. I moved a transmission from one 78 GMC to another 78. That shouldn't have been a problem. But it was. About 8 months later. Our GMC started to move on a slight incline while in park. The lengths in the shift linkage were different between the two 78 GMC's. I GOOFED . Thus the parking paw wasn't fully engaged. There is a simple adjust on the rod. That's attaches to the transmission lever that's on the trans. To make sure that the transmission parking paw is fully engaged. ( Moving the shift lever at the steering wheel to check. Will NOT tell you anything.) Pull the cotter key out of the shifting lever on the trans. Simply pull the shift linkage off the trans lever. If the adjustment in the linkage is correct. The linkage rod should go back on the trans lever pin without the need to move any components. If movement is required. Loosen the bolt on the trans rod. Mine was 13 MM. Then move the rod to make that rod go straight on the trans lever pin. Secure the adjuster bolt. Recheck rod to trans pin. Install cotter pin. I just installed a shift cable. Adjustment was required. Our GMC's are ALL over 40 years old. I'd be out there checking yours. So if YOUR beloved GMC goes over a cliff while parked. You got this WARNING. Bob Dunahugh 78 Royale
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| Re: [GMCnet] WARNING about changing anything that is involved with the transmission shift linkage. Or just age. [message #346166 is a reply to message #330549] |
Wed, 07 August 2019 12:39  |
Deb
Messages: 349
Registered: October 2016
Location: Logan Lake, BC
Karma: 2
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Thanks for the details, Bob. Just came back from WA and a Manny tranny installation. Drove for 2 days afterwards with lots of stops and starts (and parking). Ran great till about an hour & half from home yesterday (hot day, mountains, lots of manual upshift and down shifting). Stopped for a bathroom break, and just as I got into the bathroom I felt the coach moving. Ran to the front, VERY quickly scootched the dog off the seat and slammed the brakes on. I had lost 'Park'. All other gears worked fine. As I ran through the shifter, I noticed that the indicator stopped a bit farther to the left with each gear change - S was right on, L pretty close, D 1/3rd between D & N, N 1/2 way to R, R very close to P and P never seemed to 'stick it'.
Called Manny, told him what happened, what i saw with the shift indicator on the column and he said that the linkage likely just needs to be adjusted. Found the section in the maintenance manual regarding adjusting the linkage. Just seemed a bit brief. Thought I would check in here to see if there was a bit more beef to the procedure. Seems not!
The shop never gave me any indication that there was a problem with the shift cable or any other components so I am hoping that it just needs adjusting and not replacing. New tranny so I can't see it being anything internal. Fortunately I do have a working parking brake (though it doesn't hold great - need to look at adjusting that too I guess).
Manny gave me go ahead to drive the rest of the way (everything but Park works great) and with the exception of rolling backwards, toward the highway (a nice safe ditch would have stopped us first) it was a very nice trip overall. Met up with another GMCer in Bellingham (Hey Jeff), toured around the Skagit region for a few days, (Sedro-Woolley has a decent little RV park), bought goat cheese in Bow and met the goats (I'm a vet tech and miss my goats). Huge difference between the new transmission and the old. Old one worked fine - never any shifting, slippage issues (except when the fluid was low - seal leaks were the reason for the new tranny while one was available), but the new one is smooth and just 'feels tighter' if that means anything.
Now we are home, and the tranny has cooled down and I have had a good night's sleep, we will head out and crawl underneath and see what's what. She's already chocked so I should be good to go.
Scary seeing your coach moving and you are NOT behind the wheel!! At least I was inside and could quickly run to the brakes. So that is my 'golden lining' on this episode.
Deb McWade
Logan Lake, BC, CAN
GMC Alumnus
It's Bigger on the Inside!
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| Re: [GMCnet] WARNING about changing anything that is involved with the transmission shift linkage. Or just age. [message #346220 is a reply to message #346200] |
Thu, 08 August 2019 08:35 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Ken Henderson wrote on Wed, 07 August 2019 20:18"forward about an inch..." -- was that a result of your front end "incident"? How's the repair coming? Including the engine position.
Ken H.
Ken,
Yes, it was. It is coming along. Good chance I will back on six tires at the end of the month.
I plan to write this up as a complete report when I come up for air.
My phone recorded a hit of something over 2G and it was almost all on was the front end of the left frame rail.
The trouble replacing the A-arm was just a symptom. While trying to torque the drive axle fasteners, I noticed that Mary could not get the transmission into park. As good and helpful as Duane Webber was, I was eager to get home. So, when I found that Drive was now where Reverse should be, we left.
Side note: Duane is the middle of Dixielander's territory, I got he and his an invitation to a rally (owned the coach a few years and never been). If you meet him, thank him again for me. He is on the Black list, and if you are going that way, think about stopping.
The frame damage seems to be constrained to the front frame section. (Whooo!) I have this good friend that had a nice frame from a California coach and he offered to bring that to me from West Virginia. So, after wasting a lot of time trying to find a frame shop that I trust (Harold's in Novi is out.) I tracked off this way.
As to the frame damage, the two cross members that support the engine are bent as is that back pan that holds the transmission and maybe the front engine mount. The left rail is shorted than the right by something less than an inch and the frame diagonals disagree by almost two inches. All three engine mounts seem to have survived.
As said, more on this when I have more time.
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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| Re: [GMCnet] WARNING about changing anything that is involved with the transmission shift linkage. Or just age. [message #346246 is a reply to message #346245] |
Thu, 08 August 2019 15:57 |
Rob
Messages: 651
Registered: November 2013
Location: Victoria, BC
Karma: 3
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Senior Member |
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That sucks! Hopefully you find the issue quickly...
I've got a bit of a leak in my Manny tranny we installed last fall - it might be the dipstick tube, I haven't had time to check...
Rob
Victoria, BC
76 Royale - Rear Twins/Dry Bath
> On Aug 8, 2019, at 1:43 PM, Deb McWade via Gmclist wrote:
>
> Well doesn't appear to be the linkage. Talked to Manny again, after all of the adjustment exercises failed and disconnected the relay rod completely,
> manually put the transmission lever in park, knocked out the chock, took my foot off the brake and back she rolled. Manny says sounds like either a
> bracket or the pawl broke. Whatever it is, it's inside (naturally). So off to a local guy with a pit so we can drop the pan and see what's wrong.
> Hopefully something I can fix relatively easily. New tranny. I am sad :(
> --
> Deb McWade
> Logan Lake, BC, CAN
> "Li'l Sister"
> '77 Kingsley, 403, EBL EFI;
> TZE167V101404
> It's Bigger on the Inside!
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Rob -
Victoria, BC -
76 Royale - Rear Twins/Dry Bath
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| Re: [GMCnet] WARNING about changing anything that is involved with the transmission shift linkage. Or just age. [message #346278 is a reply to message #346178] |
Fri, 09 August 2019 11:51 |
Deb
Messages: 349
Registered: October 2016
Location: Logan Lake, BC
Karma: 2
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pjburt wrote on Wed, 07 August 2019 14:48Deb, you can do that adjustment from above easier and safer than laying on your back.
And unfortunately Jerry, my arms weren't quite long enough to get at it from the top.  I could just touch the clamp screw, but that was about it. So after lifting and blocking it up a bit, it was all from underneath with one hand.
Too bad. My PO had built up some steps to the cockpit to make it a bit easier to climb up there, and put access panels in the tops for storage. And made those panels an exact fit for across the hatch opening. I had carpeted supports to lie on. If only.....
Deb McWade
Logan Lake, BC, CAN
GMC Alumnus
It's Bigger on the Inside!
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| Re: [GMCnet] WARNING about changing anything that is involved with the transmission shift linkage. Or just age. [message #346290 is a reply to message #346278] |
Fri, 09 August 2019 17:40 |
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pjburt
Messages: 436
Registered: February 2016
Location: Fresno, California
Karma: 1
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Deb wrote on Fri, 09 August 2019 09:51pjburt wrote on Wed, 07 August 2019 14:48Deb, you can do that adjustment from above easier and safer than laying on your back.
And unfortunately Jerry, my arms weren't quite long enough to get at it from the top. I could just touch the clamp screw, but that was about it. So after lifting and blocking it up a bit, it was all from underneath with one hand.
Too bad. My PO had built up some steps to the cockpit to make it a bit easier to climb up there, and put access panels in the tops for storage. And made those panels an exact fit for across the hatch opening. I had carpeted supports to lie on. If only.....
Oh, well. (sigh) I tried. One of these days I might be able to actually have some info someone can use.
Jerry Burt Fresno, CA.
73 Gmc 26' Canyon Lands
Members: FMCA - GMCMI - GMCWS
A truly happy person is one who can enjoy the scenery on a detour.
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| Re: [GMCnet] WARNING about changing anything that is involved with the transmission shift linkage. Or just age. [message #346292 is a reply to message #346290] |
Fri, 09 August 2019 17:59 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Deb, not much of a job to take out the inner fenders. Then, you can sit on
a brake seat, reach in, and work right in front of you.
Jim Hupy
On Fri, Aug 9, 2019, 3:43 PM Jerry Burt via Gmclist
wrote:
> Deb wrote on Fri, 09 August 2019 09:51
>> pjburt wrote on Wed, 07 August 2019 14:48
>>> Deb, you can do that adjustment from above easier and safer than
> laying on your back.
>>
>> And unfortunately Jerry, my arms weren't quite long enough to get at it
> from the top. :( I could just touch the clamp screw, but that was about
>> it. So after lifting and blocking it up a bit, it was all from
> underneath with one hand.
>>
>> Too bad. My PO had built up some steps to the cockpit to make it a bit
> easier to climb up there, and put access panels in the tops for storage.
>> And made those panels an exact fit for across the hatch opening. I had
> carpeted supports to lie on. If only.....
>
> Oh, well. (sigh) I tried. One of these days I might be able to actually
> have some info someone can use.
>
> --
> Patti & Jerry Burt Fresno, CA.
> 73 Gmc 26' Canyon Lands
> 77 Palm Beach - Parts Coach
> Members: FMCA - GMCMI - GMCWS
> A truly happy person is one who can enjoy the scenery on a detour.
>
> _______________________________________________
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| Re: [GMCnet] WARNING about changing anything that is involved with the transmission shift linkage. Or just age. [message #346313 is a reply to message #346305] |
Sat, 10 August 2019 10:53 |
Deb
Messages: 349
Registered: October 2016
Location: Logan Lake, BC
Karma: 2
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Senior Member |
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Don't get me wrong. I'm not trying to 'dis' Manny's tranny. Sometimes there is hidden fatigue in a metal component that you can't detect. I appear to have had one. The tranny runs tight as a drum, smooth shifting, lovely to drive. There was a hidden weakness somewhere in the parking linkage that happened to make it's way into mine. Fortunately, that parking linkage is right there looking at you when you drop the pan (according to the maintenance manual). Don't have to remove the tranny itself. Should be pretty straight-forward to repair once I get it to a shop where we can either put her up on a hoist or over a pit.
Got my parking brake adjusted and it's holding fine now, so I'm not overly concerned. We'll get it sorted shortly. Overall, still quite happy I swapped out my old one for the Manny transmission. In the long run, I think I will be far better off than trying to keep up with the leaks in the old one. And based on what I found driving, my old one was starting to get kind of tired.
Deb McWade
Logan Lake, BC, CAN
GMC Alumnus
It's Bigger on the Inside!
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| Re: [GMCnet] WARNING about changing anything that is involved with the transmission shift linkage. Or just age. [message #346314 is a reply to message #346292] |
Sat, 10 August 2019 12:43 |
Deb
Messages: 349
Registered: October 2016
Location: Logan Lake, BC
Karma: 2
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Senior Member |
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James Hupy wrote on Fri, 09 August 2019 15:59Deb, not much of a job to take out the inner fenders. Then, you can sit on
a brake seat, reach in, and work right in front of you.
Jim Hupy
Thanks Jim. I will keep that in mind next time I have to get in there. I keep forgetting about those inner fenders. I think that's a good way of accessing the starter too? (on the other side?) I think I remember reading that somewhere around here.
Deb McWade
Logan Lake, BC, CAN
GMC Alumnus
It's Bigger on the Inside!
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Another couple of inches in the arms and it would have been great!