Hey guys, Finishing up on a '70 K5 and want to add new gears to help move the 35" Nitto Mud Grapplers on Weld Racing 18" bad to the bone wheels! My calculations say 4.88's should do the trick; any advice one way or the other? 4.56 vs. 4.88 with a fresh 350? Also, if I order gears, what do I have to do to make the rear end "Posi-Trak". Dumb, I know, but not a gear head...sad. Any help appreciated, Brent at South Padre Island, TEXAS Hook 'em 'Horns!!!