The three coolest gravely implements were the Dog Eater, the Circular Saw and the rotary plow.  All OSHA approved!

Nice job updating an old Gravely to be a practical machine and far better than any snowblower you could have purchased for $200.   Gravely had Briggs engines on newer 4 wheel tractors.

I always use duelies and chains in snow . when I developed the brake rotor spacers in 2015 I had the same issue with input drive adapter letting go first time I used a snow blower . I ground a channel perpendicular on pinion gear shaft then  drilled off center hole through shaft coupler and pined it through the channel and holes .and tacked the pin to shaft coupler. those hardened pinion shafts are hard as can be you would need serious tooling to do anything super nice . If I do another brake rotor adapter instead of trying to get the nubs on the inside of the brake rotor in place by welding to the cast rotor I would drill it and tap it and use cap bolts with the heads inside at 4-6 places to replicate the ring/lip on the original engine face

I applaud your technique. The most critical part is getting the shaft aligned precisely. Respectfully, your method was a little cringe, but you got it nearly perfectly aligned. Kudos. When gravely started using  non-T-head engines they found they had the same problem as you did - the tractor wheels rotated too fast. The T-head engines have roughly half the RPM output as more modern engines, like your Briggs. The joke at the time was that they switched from a walk behind to a run behind. Gravely corrected this by changing the gearing on the rear with different planetary and pinion gears. I’ve seen a few conversions but yours is simple. I would have never thought to use a brake rotor and yet with a few simple mods it works great. 👍

We need more Gravely videos❤❤❤❤❤❤

I read that the old Gravely engines turned at 1800 RPM and newer bolt-on engines turn at about 3600 RPM. No wonder you're wanting gear-reduction wheels.

Nice rig 👌

Good retrofit