727 Hard to Roll backwards

Went to roll my big block powered dart today and it was VERY hard to move. I was able to push it forward no problem but the tires would squeal when backing up (smooth concrete floor old tires). Jacked the rear up and the tires would spin forward no problem but wont move AT ALL in reverse (just a metallic clang in the trans). Thought maybe the shift linkage was miss adjusted so I took off the part to the column, found neutral using the lever on the trans and still wont move backwards. Found the thread below and went down the rabbit hole of adjusting the bands and still no help.. I rebuilt the trans a couple years back, drove the car maybe 50 or so miles and then blew it apart to send it out for paint and body work. Other than leaking out the front (re-used the one time washers for the front pump because they "looked good") it shifted great and did everything I asked of it. Has a Cheetah Manual-Automatic Valve body, bolt in sprag, and "HEMI" clutch disks and steels, new bands as well.

Gut is telling me i'm pulling the trans again but want to ask before I go through all that crap.