Have you done a pulley swap also as I've been doing up a old murry with a 20 hp briggs and it's quick but your axle weld looks pretty good I am going to attempt that next cheers for the great video keep sticking them out on the interweb cheers brother
We found a small pulley on a different lawnmower and fitted it to the gearbox on this one. Top speed was around 30mph. This mower is now dead but I removed all of the good bits to go on another one.