I am running the Cal tracks now and I will be doing the rear suspension next year with ether 3 or 4 link. its just to much work for one year I have gone all out on the front end and have built a R3 416 cubes. on paper 650 Hp and 550 plus in Tq. Plus I have a 250 shot of Nos on top of that. My thought was the bigger the tire the better this is a 4 spd with 4.88 gears, I also have 4.56s I guess I could try moving the axle back for now and re think it next year.