I think it's the differential. The driveshaft will spin the rear wheels but not a full rotation. There is a loud clunk like some of the gears are sheared off. I have a NA>TT conversion but I also have a a TT parts car with Leader gears installed. Are the diffs interchangeable? More than likely I will just have SZ do the work but it would suck to have to have two cars towed to them. I just don't trust myself to do this properly. I looked for a write up and all I found was this
