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4L80E Trans won't stay in OD James Hennis 12-13-10  
1993 Chev 3500 with 4L80 E Trans will not stay in Overdrive when pulling load. I have replaced every part in trans including the most heavy duty torque converter available. Only has this problem when towing my enclosed cargo trailer with max weight of 7500 lbs. Truck sometimes will run 10, 20 or even a 100 miles before shifting back to third and staying there with no codes set. I am at my wits end having spent thousands of dollars and still having the same problem. Don't know where to go from here can someone help?
Re: 4L80E Trans won't stay in OD rich 12-13-10  
My book and service manual say; NEVER TOW IN OVERDRIVE
Re: 4L80E Trans won't stay in OD Jason Manning 2-18-11  
Having same problem when not towing you shouldnt town in overdrive bad for tranny let me know it you figure out the problem and i will do the same tranny shop by me wants $280 to hook up gauges and computer to diagnose gonna try a couple of things before i go that route also heard of a switch on the brake pedal that will cause o/d problem will keep you posted if i can figure it out
Interchange tommy 8-9-13  
Can anyone tell me if a trans from a 1995 6.5 diesel 2 wheel drive will interchange and function properly with a 1996 3500 2 wheel drive regular gas pick up 454
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