I have come to learn that transmissions with a trans go shift kit boost pressure to 350 to 400 in reverse and can lead to pump/converter failure. I have no way of knowing if this trans had a shift kit installed or not. Not by looking at it anyway.
I have a TransGo TF-2 in the 727 of my street car. Lost reverse last fall backing down the drive way, fresh trans with less than 800 miles on it. Made a bang like a stuck brake shoe releasing?
I have yet to even look at it
Being as I do have a forward gear I'm thinking broken band, accumulator or the strut rod
Never knew about the high pressures in reverse, good to know.
Have to agree with those who have suggested the pump.
Good luck
