Change rear diff fluid today

[outlaw2]

Changed mine yesterday at 1500 miles with RP 75w90. Couldn't believe all the metal dust on the magnetic drain plug, looked like a mushroom. Read on this site it is normal for break in, did the M-6 trans too...What an Improvement in get up and go and Smoothness..............Get er Done

[Doc]

Originally Posted by outlaw2

Changed mine yesterday at 1500 miles with RP 75w90. Couldn't believe all the metal dust on the magnetic drain plug, looked like a mushroom. Read on this site it is normal for break in, did the M-6 trans too...What an Improvement in get up and go and Smoothness..............Get er Done

Don't put their Maxgear 75w90 in the trans; use their SynchroMax instead. I know it says it's for an auto trans but that's what GM requires for this transmission.

[FiLTHy PHiL SS/RS]

Originally Posted by 2010 Bumblebee

I'd may go with the the mobil 1 for the waranty, but the label is misleading. It's called LS and says it's formulated for limited slips but if your car calls for additive you still have to add it. Read it carefully.. I had mine done at the dealer for $66 total. They said they used something new that they are using in the vettes. I think it's GM fluid. It was cheaper because it came with the additive in it.

Mobil LS.... I just picked that up tonight thinking i was all set. D'oh, read on my new england post you need to add more friction additive on top of the already added by mobil.
just found this quote to back it up.
holy crap...i'll be....dipped im butter.!

[FiLTHy PHiL SS/RS]

Originally Posted by 600hp-lpe

From the Manual (page 10-7)

Rear diff:
Rear Differential Fluid 75W-90 Limited Slip to GM Specification 9986226.
GM Part No. U.S. 89021677 and Friction Modifier 1052358,
in Canada 89021678 and Friction Modifier 992694

I believe you need 2 of the friction modifier bottles to add. They are small.

Auto Trans:
DEXRON®-VI Automatic Transmission Fluid.

Page 9-30 has the location of fill and drain plugs.

Pulled from new england section

[Blueovalman]

Originally Posted by Doc

Don't put their Maxgear 75w90 in the trans; use their SynchroMax instead. I know it says it's for an auto trans but that's what GM requires for this transmission.

So true.
I talked with a GM Master technician and he told me that every
differential service you do you will need two bottles of Mobil 1 synthetic
75W90 gear oil and one bottle of GM LS friction modifier additive.
Also most Chevrolet dealership service departments will just take
out your drain plugs to flush out your differential fluid by the time
you do your differential service your differential fluid will have
shavings and small peices of metal in your differential fluid.
I highly recommend taking your differential cover off and cleaning
the inside of your differential then refilling your differential after
you installed your differential cover.
Everytime I change my differential fluid once a year my differential
cover always comes off regardless of what.

[FiLTHy PHiL SS/RS]

So does the rear diff cover have a paper gasket you can buy or is it just gasket in a tube?

[mikeSS]

changed mine at 17k heheh.

[jm251]

Have stock rear diff fluid at 29k. Didn't know about this till now. Going to change immediately but think I've hurt my rear diff?

[Brianskeet]

Originally Posted by jm251

Have stock rear diff fluid at 29k. Didn't know about this till now. Going to change immediately but think I've hurt my rear diff?

You haven't hurt anything. Many many Camaro's won't change till 100,000 miles cause that's what GM says. Changing now is going above and beyond which I whole heartedly support. Swapped mine to RP Max Gear. Got a lot of metalic sludge out so I am happy it is out of there.

[The Blue Ox]

Gonna change mine real soon! Better safe than sorry! Think I'm gonna go with the Royal Purple!! 20,000 on mine now!

[CHEV400]

Changed mine today with RP. Used half a bottle of the friction additive. No noise here.

[The Blue Ox]

Changed mine today with RP! didn't add any friction additive cause it said it was already included! Had a little sludge on both plugs but wasn't that bad! Fluid looked a little dirty,and glad I changed it! Had a little trouble getting my ratchet in between the drain plug and 3" exhaust but managed! Had to add 2 6" extensions on the ratchet to make it easier to loosen and tighten fill plug! Yep,and have to be careful not to lose rubber gaskets on plugs! They will fall off if not careful!

[knitetrain05]

Originally Posted by CHEV400

Changed mine today with RP. Used half a bottle of the friction additive. No noise here.

I would do it my self but.. I see the drain plug but what of a fill? I can't find that. Wish I could buy a full service manual for the car

ANYBODY.. HELP

[tadams72]

Originally Posted by knitetrain05

I would do it my self but.. I see the drain plug but what of a fill? I can't find that. Wish I could buy a full service manual for the car

ANYBODY.. HELP

Same side, a little higher up.

Sent from HTC Rezound so if you can't read it or my grammar, spelling, or other sucks, it is the fat fingers trying to type on this small screen. Took me 10 minutes to type this correct!