My friend built a drag car a couple years back ran it once and ended up parting it out. To make a long story short i got the pro drive spool. But the problem is that he doesn't remember what tranny it came out of. I know it was a hydro tranny. I know there is 2 different spools for b-series trannys. I installed the spool in my cable J1 tranny and everything seems to have worked perfect spins fine shifts fine. But im thinking about cracking it open again just for peace of mind. This is where i need some help, what do i need to check out to make sure i have the right one? Thanks