My b44.1 was crunchy as hell... until I found out that I had not assembled the diffs properly (amazing beginners' mistake) and now it's as smooth as a baby's arse

I raced it again saturday in a very demanding track (indoor non permanent track, polished wood equivalent + hard jumps) and the diffs held just fine with a 7.5BL. I could tell you how many shims I have on each side of the diff, but then again different batch of plastic parts will require different shimming I'd think.

Paul