I hate to beat a dead horse, but I gotta ask what guys are doing. I know it usually recommended ( at least around here) to use 4.88s or 5.29s with 35s and a six cylinder. But I can't trailer my rig so I need some kind of highway performance too. I will be installing an SM420 in front of my "3spd" case and doing gears soon to get my rig back on the road. I am running a rebuilt 2F, basically stock with 35's and SOA. Will my 2F push this thing to 70 mph with 4.56s? I just hate the idea of spinning 3,200 rpm or more just to hit the speed limit. By the way, I will have a saginaw to compliment my disk brakes before you have to worry about me racing in to you on the highway.