Developed a weird problem last night at the track. In reverse it acts like it's binding, or like it's still partially in 1st trying to go forward too. All forward gears and neutral are normal. First noticed something unloading the car at the track, but thought it was just because I was parked slightly down hill didn't give it a second thought. Then at home unloading it is really pronounced. Something is jacked with with reverse in my reverse manual valve bodied A-904.

Any ideas what it could be?

THANKS