Picked up a used R151 last week. After taking the case apart, verifying that all gears work and some mild cleaning, I reassemble. I swear I verified that I could shift into all 5 gears plus reverse once it was all back together and on the bench.
Now that I have in the truck, it will not shift into reverse. All other gears are fine.

Any thoughts before I pull it back out?

-Chris


'88 EFI Xtracab, 32 x 11.50 Buckshots, AZ bed, Turbo drivetrain.