I just bought an 87 GN, tranny seems to work fine under normal driving conditions. I was told tranny has been built, so I really have no idea on the internals. I do know has a manual trans brake, deep pan with temp gauge, Pro Edge Converter, fluid looks good. So when you launch the car it leaves hard then acts like it jumps out of gear, let off and then apply power and tranny acts fine. I have check converter depth and it is correct. Any help greatly appreciated. Thank you