davidol said:which is better and why bill?
full on competition would prefer to use plate type locking diffs... as both wheels will lock regardless to their position on the road etc.... (in the air or not)
think of jumping touring cars over curbs or rally cars in the air with one wheel etc...
They also have a % of locking on overrun, which aids stability under braking, which an ATB cant do.
I run an ATB diff, which for me on circuit use, keeping both driven wheels on the ground seems ok for me.. but I have also heard tale of a mk1 sprint golf which @ a sprint track was faster by 2 secs on his bets lap with a plate diff when he changed from a quaife atb. Sounds very impressive, but it might be urban legand material too.. who knows.
Peloquin is a US version of the Quaife, which can be found cheaper in some instances for supply buying from the US direct.