Originally Posted by evochick

Some more observations,

So I tried installing the Speed passion carbon rear axle, Fail...
After I installed I noticed that the metal part wasn't true to the carbon shaft causing the wheel to wobble, also the diff action was not smooth like it was binding, no issues with the STJ carbon shaft and housing, diff is smooth and tight,

I also tried the new Tamiya 84380 carbon Shaft and housing set, but is 3 mm wider then the STJ diff, so it is possible to use if you want a little extra width. The Clamp hub 54240 will also work to a point. The Carbon axle doesn't extend as far into it as when installed on a Tamiya and does clamp fine but doesn't extend to the grub screw. You will also need about 6mm spacer.

I think ill just stick with the STJ diff and axle for the minute.