| [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:
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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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