Ok guys so how come The only option for a rearend gear besides the 3.90 is the 3.38?(1960 C10) If it's a GM 10 bolt assuming it's a 8.20 or 8.50in dia. gear why can't I use other gears listed for that size? I was looking with my buddy who works at NAPA in there performance parts and there were all kinds of gear ratios (even the 3.90 but no 3.38) I was looking at a Richmond 3.08 gear but again before I make any decisions I know there has to be a reason why there's a problem with this or I'd hear all you guys saying you can easily put gears in the rear and not have to special order the 3.38. -Thanks Danny

Thanks,as always -Danny

1960 C-10 Stepside,Longbox
235,4spd 3.90 diff.