Transtec are good, but my money would be on Driver Transmissions.

If you call Drivers, tell them Jeff from Geartech recommended them and they will see you all right.

Central Axles, speak to Tim and again Jeff from Geartech recommended them.

Transtec chenged hands a couple of years ago and I dont know the new owners.

Sadly, Geartech only do manuals and send Drivers all of their auto work. Geartech is run by my brother in law for my old man and know their stuff as well.

Jeff