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4L60E Slips in Reverse only when HOT!
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Question
aflesch
I just finished rebuilding the 4L60E in my neighbor's `03 Avalanche Z71. The problem I am having is that it slips in reverse but only when it is hot. It shifts through all forward gears with no problems and even when it's hot I still have engine braking in manual 1st. This lets me eliminate the Low/Reverse clutch circuit as a possible cause.
Line Pressure Test Results:
Cold: Idle 1500rpm
Drive: 60psi 210psi
Reverse: 68psi 270psi
Hot: Idle 1500rpm
Drive: 60psi 210psi
Reverse: 62psi 120psi
This tells me that I can also eliminate the Pressure Control Solenoid as a possible cause since it functions properly in Drive. I am left with a problem in the Reverse Input Clutch circuit.
If the problem was the Teflon Sealing rings on the nose of the pump wouldn't my problem only occur when it was cold since the rings expand when they get hot? Same with the piston lip seals?
Have you ever seen this problem? Or do you have any thoughts?
Thanks,
-aflesch
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