I had a stock D5 restalled to 2800,installed a heavy duty lockup clutch,harnened hub,brazed fins, torrington bearings,balanced.
This was done at Empire Converters in the Falls.We brought him some converters from other Buick venders that needed to be cleaned and checked .He said there was nothing in there he could'nt do or do better.He's made coverters for Mark at R&R
The shop is hard to find(it's at Niagara Falls airport), and the prices are hard to beat.My converter cost $135 with tax since I had the D5 to give him.The guys name is Bill and the phone# is 716-731-4225
All they do is converters and they've been around for a long time.He does converters for most of the tranny shops in area.
Call him up and check out the shop
John O