Dude, you can't say burnout.... Hotrod either... I'd stick with the 4 speed and drop the rearend gear. Wallaceracing.com has a good calculator to figure your rpm and speed for any given tire size and gear sets. Best of luck to ya
3000rpm cruise never hurt anything.
My hopped up 6 will easily do burnouts. lol Yeah nothing wrong with the sm420 except the wide gear split...when I downshift to 3rd I don't want to go from 2000 rpm to 4000 rpm like it does...For cruising and highway driving I love the sm420...slow shifting and long time through the gears...but I have a 3.73 rear end and I like it that way because I can utilize the torque really well...makes taking off really nice and fast, and is a good ratio especially since I use the truck for working as well. Was able to pull a hill in 3rd from almost a dead stop towing a 2000 pound trailer and it accelerated the whole way. Thanks.
