Here are some things you don't want to do to a manual VB ever! Don't ever use a check-ball seat repair. If you can't wet stone a plate and use a slightly larger check-ball. Just replace the plate. Here is a picture of a plate that A customer took to shop 3 times to have it fixed. It never lasted more than 100 miles each time. After 3 times the customer gave up on him and brought it to me.
Somebody should be banned from building for this.
This is the low/reverse shuttle ball the bathtub is not deep enough to allow the ball to sit on the new seat. It just bangs the side of the repair seat. Because the shuttle ball has to close fluid in 2 directions and cannot in one direction the direct & forward clutch drums burn the frictions in short order.
I believe that this is a TCI Manual Valve Body. If any one knows for sure I would appreciate it.