I’ve got an ariens st824 with the serial number starting 924. This past weekend I was blowing snow and the impeller works great but the rakes stopped rotating. The fella before me told me he replaced the sheer pins with regular bolts and I didn’t think anything of it at the time but I’m guessing my gear box is shot. I don’t know a lot about it or how to fix it. I had a trusted local small engine shop tell me it would cost me $375 for the gear box and another couple hours in labor. Apparently parts for the gear box on my model are no longer available, so I have to buy the whole new part. Does anyone have experience with this? $535 seems like too much to spend on this old of a machine. I’m worried I’d have it fixed and something else would go wrong with it.