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No reverse or over drive Chris patterson 2-14-08  
Went out to the garage today to take my 1991 gmc 3500 4x4 up to the car wash and no reverse??? checked the fluid it was fine. Decided I would take it up for the wash drive was still working. On the way there I notice no overdrive?? I have the 4L80 E trans Does this sound like a mechanical problem or electrical? THANKS
Re: No reverse or over drive Carl 3-11-08  
Check the fluid level. Fluid pressure may not be enough. The reverse have a much higher line pressure than the forward gear ranges. Reverse Servo seal failure. A simple fix but since the transmission is out of the vehicle. They should do a check for other wear.
Re: No reverse or over drive Bob G. 3-26-08  
I was browsing thru the problems with the 4l80e and found a great site for the overdrive problem.
I just replaced all the solenoids and have great shifts but no overdrive.

Bob G.
Re: No reverse or over drive gary 2-27-10  
I have a 1980 dodge monaco moterhome.allof a sudden i lost reverse.all the other gears are fine just no reverse.checked every thing,fluids and linkage are fine.any suggestions.
Re: No reverse phyllis 7-26-12  
Transmission checks out good but it will not in reverce, is there a brake on it?
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