Sorry mate, the Tmaxx has bigger balls than the FF, I just checked. Damn shame the Tmaxx hubs wont fit under 2.2" wheels. Its close, but its not happening unless you find some really oddball, slightly oversized 2.2s.

You mean the FFS023 One Way Diff? I dont see any diference between the cups with that and the stock ones, from pics at least... Im presuming you tried the stock ones? I cant find any mention of different cups anywhere. Whats the difference? Any pics? Fetch the dremel?

Anyway - you got money burning a hole in your pocket or what? You know what will happen with that one way! I wouldnt try one purely on the cost of it... love to know how you get on though mate, you running the 18 behind it?

sorry I cant be of any help with the cups.