Truck wont shift into reverse after warming up but will go into reverse if engines cold

Asked by Sep 08, 2016 at 08:33 PM about the 2008 Chevrolet Silverado 2500HD LT1 Crew Cab 4WD

Question type: Maintenance & Repair

I just installed a rebuilt transmission into a
2008 GMC SIERRA, it shifts fine when first
started but after it warms it won't go in reverse.

1 Answer

830

I think the trans in your truck is a 4L80E. I have seen the low/reverse piston seal leak and cause your problem. It is possibly that the builder nicked the seal when they were assembling it

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