I did a 120/310 and with a 50/44 I did a 140/200, unfortunately I cant change belt to sheave, cutler adjustable weights, gates belt and 1.74 gearing. NOW on my buddies sled, same thing 15 s rush, he wants to keep 1.61 to compare. I put in a 120/310 (stock pro r) and a 155/222 in the back. I...