Transmission question

Reverse works intermittently, as in will back up on flat ground with some coaxing? Or its good one day, not so the next? The offer of manual and video are awesome, if you can pull it, fixing it isnt much harder. Toughest part is getting torque convertor to spline up.
Works as in I'll put her in reverse and let my foot off the brake and it won't move at all. (on flat ground) I give it just a little bit of gas and it will jerk into gear. Other times it will work fine