mugen diff
 

Is somebody could tell me if i can put MBX5T diff and pinion in the MBX5 buggy??
I've check teh manual and both have the same diff case (diff housing)
But i want to put MBX5T diff and pinion in my MBX5 buggy to have the 4.6 ratio of the truggy, to eliminated the pinion size probleme.

Will the MBX5T diffs parts fit the RCM 1/8th Revo Cases?

Not sure but i think you can place any 1/8 diffs and pinion in the RCM hybrid case.
But please, it's not my question !!!!!

I don't own a Mugen buggy, but just from looking through the diff parts available for them, it looks like the 46 tooth ring with the 10 tooth spiral pinion is an optional gear ratio.

It looks like it will work to me.

I haven't been able to find the diameter of that pinion shaft. It appears to be an 8mm shaft with a 6mm turned down end where the cup mounts.