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I have a 1991 gmc truck with a rebuilt tranny and engine. My...

<< Back to: rec.autos.vw [W] TECHNICAL, FREQUENTLY ASKED QUESTION (FAQ)

Question by plummer
Submitted on 11/16/2003
Related FAQ: rec.autos.vw [W] TECHNICAL, FREQUENTLY ASKED QUESTION (FAQ)
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I have a 1991 gmc truck with a rebuilt tranny and engine. My problem is when I pull my boat (1500 lbs) it will travel at hiway speed for about 100kms in overdrive then it will suddenly gear down to 3rd gear and stay there. but if I stop for 1/2 an hour and go again it will go to overdrive again. I am getting a code 68 which is tranny slipping. Tranny shops say I should be in o/d because it is the 4l80e tranny with 350 motor. please help


Answer by tolga
Submitted on 4/20/2004
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please check the owners manual, towing section

 

Answer by chris
Submitted on 1/20/2007
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your not supposed to tow anything in overdrive your suppose to gear down. you probly burned up the servo or a spring and valve is stuck.

 

Answer by mavrrrik
Submitted on 6/11/2007
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try getting a trans. cooler

 

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