Recently removed gearcase from rear, no oil in unit, bearings totally destroyed. Are any of these bearings pressed on? Any info, insight or suggestions as I begin repairs would be great.

 

The bearings aren't pressed on,but you may have a little trouble getting the bearing races off if the outer bearing cages come off. This is where a good air hammer and bits come in handy.Look carefully at the ring and pinon gear for any worn,chipped teeth. Also if you can see any "universal" numbers on the bearings,get these at any bearing house,auto store,etc to keep from paying high dealer or online prices.Use 80/90 GL4 or GL5 oil when you have it back together. Dirt Cheap Yamaha, Honda, Arctic Cat & Polaris OEM Parts & Accessories – Cycle Parts Warehouse
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Which parts are wreaked?