5.3sierra

mine also came with a g80 w/ 3.23.

seltaeb

My 2wd has the G80 and 3.73 gears with the tow package.

Sc00by

Same here 2wd with tow package 3.73 gears and a destroyed G80.

1FastBrick

iTrader: (17)

My 5.3 extended cab shoetbed has 3.42 with a peg leg and I do have the tow package. some one changed the hitch from the round type to the square type. guess they wanted a heavy duty one.

ajrothm

I just looked at my code to see what Diff I had.... GU5(3.23) and G80..... 3.23 sux, especially with my 32" tires on it......At least it has posi though....I would have loved to have 3.73s....

fastnblu

iTrader: (2)

These RPO's are always what I went by.

What are u callin factory lockers, the G80? Or is there a better factory diff I don't know about?

I know mine does.
I searched out my truck, for other options tho.
G80, trailer pkg, & 3.42 off dealer lot.