The more work you do yourself the cheaper it will be. I would think finding a "good" core transmission from a late 80's to early 90's (up to '93 I think?) A518 would be the ticket then do a rebuild yourself. If its in mostly good shape all you will need is maybe to put new/better clutches in, and a transgo TF2 kit or similar in there. The OD unit is not very tough so if you race, don't do it in OD! AT least ... that's what I've been told (and why I'm planning a Gear Vendors for the van..) Good luck!