So far the only parts I've bought from the Ozzy dealer, pan gasket $80 and trans filter $70.
What ATF are you planning on using?
To date Brian has recommended Nulon, and submariner Reg has reported +tve on Castrol.

I guess the last thing is that if your tranny is shifting as bad as you say now, you should get your trans-tech to check the fluid that is drained off. Discolour or burning maybe OK, but if you find a lot of metallic sludge in there, it could be that there is already significant wear such that the JWVB won't save it.

One tell tale sign of a tranny just about to go out is if there is a big delay when shifting into reverse.

Have you noticed anything like that?