Rolls forward in neutral, locks up rolling backwards??

mbaird said

Did it roll freely before engine / trany install?
Did you change anything else ? Wheels ? Etc ...

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No, it didn’t. I had no problems with the tranny when it was running, pulled the engine and rolled it around a few times. Pushed it into my driveway for the last time before dropping the motor, and had problems shifting into park. Driveway has a slight incline.

Then when the time came to push it into the garage to drop the motor, couldn’t shift into neutral. Eventually I thought I had freed a stuck park pawl and was able to BARELY spin one wheel with all of my might. I pushed it into the garage with my truck, and it was doable, but seemed harder than it should’ve been using my truck.

The only work I did to the tranny was replace the front pump and torque converter. Nothing has been done to the differential, only work I did to the rear was bleed the brakes.