I had a look, that process is quite elaborate.. I don't want to disassemble the trans ( gears/shafts/bearings). I just want to replace the case gaskets. I'm particularly thinking of that detent plate assembly, do I need to do anything to it to remove the case?Have a look at the "5 speed 101" by Steve Hoelscher. Most of it applies to the 4 speed as well, including the 128 variant.