Xtreme Mower Mayhem

i am going to do the live axle and sporket way of lifting but i need help how fast i am going go the hp12.5 with a 8 in pulley on the tx and then a 20 tooth sporket on the tx then a 60 tooth sporket on the axle with 40" tires

Your better off going 42 to a 42 tooth. Then you can modify the pulley set-up from there.