I got a 2002 4.3 sierra. it is bone stock with an open diff. I am wanting a rear end the locks up so i dont end up stuck on a boat ramp. what are my cheapest/easiest options. thanks!

 

Cheapest would be to find a used G80, and with that 4.3, you should be more than ok with it.

 

now when looking for that diff im seeing different sizes for 10 bolts. how do i know what size is correct and number of axle splines without taking it apart?

 

8.6" is the size ring gear for 1999-up 1500 series trucks. Unless it is a Vmax or SS 2WD, as those are 14 bolt semi-floating rear ends with 9.5" ring gears.

 

easiest and cheapest thing you can do is find a wrecked or salvaged z71 at the junk yard and go with that rear end its a G80 and guesing if will fit wont be a problems cuz it will bolt up.

i think theres very few z71's that actually dont have a G80 in the *** so be carefull with that

 

x2^^^^

 

so are your saying the whole rear axle or just the diff? thanks for the info!

 

Just be sure to check in the glove box for RPO code G80

 

I'll sell you my old G80 if you want?

 

price, year of truck it came out of, miles, and condition please. thanks!