how can i tell if my 2007 new body sierra 4x2 w/t has a lsd without pulling the cover?and whats better, lsd or a locker? winters in n.az are very muddy so i need to know whats better for mud and snow.

 

if the rpo code G80 is in the glove box you have a locker.

Go to a dirt road and punch the gas. If there are 2 tire marks you have a locker, if only one, its an open diff.

 

You WANT an LSD but you DON"T want a stock G80 unit. As stated, check the glove box for G80 and that tells you if it has a stock LSD or not.
If it doesn't I recommend an Eaton Tru-trac
If it DOES I recommend changing it for an Eaton Tru-Trac

 

i am curious why dont you like the G80 locker viciousknid?

 

they explode, taking out your entire rear differential with it.

 

The G80's are prone to breakage and aren't very good LSD's to boot. For clarity a "locker" is good for offroad where one wheel may be in the air. In those cases a LSD is useless but a locker doesn't like to corner well
An LSD will work very well where there is limited traction, like mud, snow.

 

I like hand grenades but i'm not going to put one in my truck.

 

the stock g80's on a stock truck aren't bad at all they accomplish what they are made to do. BUT once you start adding more power to the truck and/or bigger tires to the truck the stock g80's have been known to explode ruining the diff. a full "LOCKER" aren't really ideal for a DD truck they are better in strictly offroad applications but the eaton tru trac is an awesome LSD that will work wonders on and offroad.

 

hummm i see, i have never seen one grenade and i work at a dealer but we dont work on alot of lifted trucks or suvs for that matter, but i will keep that in mind when advising people that want a lock rear diff. i would like to put and electric locker in my front diff. but i dont know alot about them and i dont want to break **** that bad either... but thanks on the info about the G80s...Randy

 

all that info is very helpful guys, thank you much! i will go to the eaton website and try to find the pt # for my diff.and is the 10 bolt in my truck a 8.5?