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Had tranny rebuilt for no reverse had new clutches installed and changed pressure valve in pump still no reverse.could it be a sensor in pan.pulled tranny 2 times from 91 chevy one ton 4x4 it has great forward gears no reverse.
I have a 98 GMC K2500 Suburban with a 4L80E and sometimes it takes a full minute to go into reverse. It goes into D instantly. All FWD gears work great, even pulling big trailers and downshifting to go down mountain passes.