I have what I believe is a DANA 4360-140 transaxle, with the stock 3.5 inch pulley in the front, and a 3 incher in the back. It's going around 14mph with the current setup, but I'd like to swap to a 5.5 in the front, and a 2.05 in the back, which works out to roughly 35mph. Thing is, I know the stock transaxle isn't meant to go 9000rpm, but it's already going about 3 times as fast as stock.
Will the stock transaxle hold up? Is there anything I need to do to make it tougher?