B2 Piston Woes (maybe)

[mechanicalman]

Alright, so i was stopped at an intersection to make an unprotected left-hand turn. At the opening in traffic, I floored the gas and the car started to move forward and suddenly it came out of gear and I lost all power. Luckily I made it to the curb without incident, but I couldn't get the car into any forward gears. Reverse worked just fine.

After getting a tow home, I researched the forum and it seemed like an obvious B2 piston issue. After getting the parts I started working on the piston. Unfortunately, the B2 piston was not only totally intact, but had been replaced with the newer style piston already along with the metal bushing in the piston bore. However, the seal piece in front of the bushing looked rather mangled, and didn't seem to be seated very well. Could this have caused the rough shifting I experienced prior to total failure? Unfortunately, I didn't order the black rubber seal in front of the bushing as part of this repair. I couldn't even find it in the Fastlane catalog.

On top of that. I noticed looking into the bore, that the foot of the brake band wasn't where I expected it to be. If you look at the picture, it seems to be sitting way down near the bottom of the bore. All the pictures I've seen had led me to believe the indentation for the push rod would be near the center of the opening. Did something happen to the brake band itself?

How should I proceed here? I'm pretty sure in any case, I'll need to replace that seal, but I don't know the part# for it.