I remember reading an article a few years back re: T400 lock-up converters. I do not remember the companies name. It was a Hot Rod (I think) mag. article behind a very stout BBC. I have a friend looking to reduce his final drive RPM in a BBC twin turbo'd jag and I thought this could help him, as gears for the stock dana jag diff are limited in choices. Does anyone have any info on these converters? Thanks for any input.