Parke10

iTrader: (5)

Just finished doin mine, first time its been done and it had 46k miles on it, fluid was pretty bad. mag looked pretty clean. i used 75w-80 LS Mobil 1, it feels like it runs smoother, but thats prob all in my head.

budhayes3

iTrader: (19)

Placebo effect But hey, if it makes you feel good, roll with it

Parke10

iTrader: (5)

Word..

black4.8

iTrader: (1)

lucas here

Parke10

iTrader: (5)

the stupid thing has a very slow leak and idk why, its leaking from the cover, i made sure when i had the cover off i got all the old gasket off and i even cleaned it up when brake clean.and i made sure the rearend its self was clean too, but still has a tiny lil leak, i even double checked the tightness of the bolts. looks like im gonna have to put a lil RTV or something on it.

Mangled03gmc

iTrader: (95)

Lucas 80-90

QLF

Use a bead of black high-temp RTV silicon all the way around the new gasket. Make sure the entire gasket surface is super smooth with no nicks or dirt. I use some Scotch-Brite to clean mine after wire-wheeling. Slowly tighten the bolts until they are hand tight, then put a 1/4 turn on them with a ratchet. Now wait about an hour or whatever the RTV says to let it set up. Then come back and tighten them to spec.

I use Royal Purple 75-140 synthetic with my Yukon's and Zexel.

Gixer

if I use Mobil 1, do I need the the additive for limited slip ?

Avalanche2002

No additive for the G80.

I don't have to deal with taking the cover off my 02 Avalanche as it has a drain plug on the bottom of the rear diff. I just changed mine at 59k miles last weekend. It took about an hour start to finish, cleaning up included, and about 8 ounces shy of 3 quarts of Mobil 1.

Gixer

thanks for the reply, I did it Saturday and I added it anyway to be sure. im glad I did have to take off the cover, the magnet was full. 150k and 1st time.