I'm trusting BRP over-engineered all of the components in the Commander platform, so IMO, all can sleep well tonight,,,,I'm not loosing any sleep over this one,,,here's an example:
The Rhino rear diffs are 99.9% trouble-free of any carnage from any Rotaxs, R-1s and Busas that have been swapped into that platform......the front diffs just need the ring gear bolts tack-welded so they don't back out in high HP applications.....
Most peeps will tout running in 4x4 in these Rotax/Rhino swaps (and pumped-up Rhino engines) as the torque is distributed both to the front and rear instead of just to the rear...just to help take some of the stress off of just the rearend components.....but Yamaha designed these diffs for their little single-lung engines (the 660 only has 23 HP to the rear wheels)....Lance