Snapper MCRP215015KWV. Replaced all xmsn parts on the mower this spring except the sealed transmission differential housing (parts schematic below)

http://www.partstree.com/parts/?lc=snapper&mn=MCRP215015KWV+(84645)+21%22+5+HP+Steel+Deck+Commercial+%22M%22+Series+15&dn=7414

All was well for two months (16 mows) but last week hit the clutch handle and - nothing! power was moving all the way through the drive train to the Snapper 7019213

PULLEY, Poly-Vee Belt pulley, which was free wheeling. I could turn the V-belt pulley and it did not make to the transmission differential, and because of that, no power to the wheels.

Appears the Snapper 7050830 AXLE, Short is slipping out of the differential as well.

Looking for troubleshooting guidance. Anyone? Thanks in advance.. bet it's simple, but then so am I!

Sundog