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Help with 4L60e basket case Alex 11-25-11  
4L60e behind completely rebuilt 4.3L Vortec, installed in a '95 GMC Jimmy 4dr/4wd.

Trans not separated during rebuild, bottom end of motor was okay.
Truck starts, shifts fine and then once it's warmed up, it stops shifting.

Truck belongs to Terminally ill cancer patient so I need to resolve issues ASAP.

Any ideas or suggestions?
Re: Help with 4L60e basket case BUBBA THE BUS TECH 11-28-11  
If the trans was not removed from the engine it was not rebuilt. If the transfer case was not removed from the transmision it was not properly rebuilt.
There are several components that can stick and fail depending on temp of oil and how much junk/dirt/metal particals were not removed and cleaned properly.
I am going to guess one of the lip seals inside the trans only seals when the oil is cold and thick.
Have it scanned by a person who has a scanner that can actually see what the computer is commanding.
If there is no issue there the trans needs to come out and be torn down cleaned and resealed at the very least.
Good Luck
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