Originally Posted by TORMENTOR
They come with 3 different ears ratios 3.21 3.55 or 3.92. Q/c is quad cab.
He probably had the 3.92
3 gear ratios (listed above) and 3 cab styles. all make a difference in accleration.
r/c = regular cab
q/c = quad cab
c/c = crew cab
there is also a sticker on your rear axle tube that lists your gear ratio if you don't have your window sticker or build sheet.