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4l80e Ed O 5-6-09  
1996 motorhome 454...the trans will not shift to 4th or overdrive..get no codes..my mechanic replaced switch on break pedal...not the answer..he feels its electrical not in trans but cant find it can anyone point us in the right direction?
Re: 4l80e Pete 6-5-09  
Check the ohms to shift solenoids and TCC solenoid. When the TCC solenoid wears it leaks pressure and will come out of OD when warm or not go in at all. Also check the TCU plug on drivers side of transmission when you unplug the connector if ATF fluid is in it replace the internal harness.
Re: 4l80e Pete 6-5-09  
Some where around 96 is when GM had to upgrade the internal harness due to leaking thru and deteriating the wires i have seen this on later models also that shouldnt do it because of the upgraded harness but it still can happen.
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