I think I've got grade 10.8 in mine ...
Good score, Rob - looks like a decent unit. Certainly better than anything brand new these days. The new ones look so thin and light, it's a wonder they even last a season.
I put heated grips on mine a few years back when I rebuilt the gear case and impeller section. Got a pair for an ATV/ dirt bike/snowmobile - they're just peel n stick grids. Yanked the grips off, stuck them on, and reinstalled the grips. Had a pigtail hanging out of the engine for a light, so I tapped into that for grip power, and installed a Hi/Lo/off switch in the dash. Works great! Whole gear case, and every bearing, bushing, and belt is new.
I was tossing 3 lb. boulders with it last year, so I'm thinking I need to do the mudflap mod if I expect it to throw any snow this season. It beat the impeller up pretty good.
Rebuilt the transmission last season, and found a decent solid axle, and sold that infuriating differential assembly that would constantly spin the wheel with the LEAST amount of traction. Turned that machine into an infuriating battle every time I used it! Finished it off with a new chain. Only thing I haven't touched on it is the engine, aside from a carb clean.
It's a '88 Toro 828 Powershift. That Powershift feature is the balls.