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4L80E trans won't work when cold travis may 2-26-11  
We have a '06 GMC HD 1/2ton with 6L and 4L80E. When sitting outside in the cold, the tranny won't shift at all. Push truck inside for the night and we can drive it out the next day after cycling the shifter through all the gears. Sometimes a rattle sound from torque converter area when idling and goes away when able to mput in gear and move. Are these likely torque converter or pump or solenoid issues? Is there a common failure on these or is it more likely a complete rebuild is needed? Thanks for the help.
Re: 4L80E trans won't work when cold BUBBA THE BUS TECH 2-28-11  
It sounds like a very tired unit. A service may help but what it most likely needs is an overhaul to cure all the hard internal seal and converter problems causing this.
Good Luck
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