Gear Oil
Thread Starter
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Gear Oil
I know you've all seen this topic probably a million times, but I searched the forum and couldnt find the answer I needed. I need to change the rear differential fluid. I know that I need 75w90 gear oil, but i'm not sure which brand to use. Also, Where can I find the limited slip additive? I havent found any places that carry it.
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Get the GM gear lube and the GM LS additive. It ain't expensive and you'll know it's the right stuff. I don't have my maintenance records with me at the moment, so I can't tell you what it cost me, but I do know it wasn't enough to make me remember!!! 
See your friendly, local Chevrolet dealer for the fluids.....and DO IT YOURSELF!
Larry
code5coupe
See your friendly, local Chevrolet dealer for the fluids.....and DO IT YOURSELF!
Larry
code5coupe
Last edited by rocco16; Apr 24, 2006 at 11:32 AM.
Racer
Joined: Aug 2005
Posts: 336
Likes: 3
From: State of Confusion
If you plan on driving it hard, then use a synthetic 75W-90. The synthetic will stand up to the heat and abuse better than a coventional. But be careful! Most of your high performance sythetic gear oils(like Red Line and even Mobil1)come with friction modifier already blended in. This is a case where too much is not a good thing.
Best of luck,
Adam.
Best of luck,
Adam.
Racer
Joined: Oct 2005
Posts: 405
Likes: 0
From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
Originally Posted by MATCHLIGHT
If you plan on driving it hard, then use a synthetic 75W-90. The synthetic will stand up to the heat and abuse better than a coventional. But be careful! Most of your high performance sythetic gear oils(like Red Line and even Mobil1)come with friction modifier already blended in. This is a case where too much is not a good thing.
Best of luck,
Adam.
Best of luck,
Adam.
The additive was approx 11 $ and the synthetic was made of gold, 60$ a liter. But that may be way cheaper in the USA.
Instructor
Joined: Jan 2006
Posts: 230
Likes: 0
From: Ol Dirty Durham NC
Originally Posted by Nico
I even could buy it here in Spain, probably the only thing I could buy for my vette here.
The additive was approx 11 $ and the synthetic was made of gold, 60$ a liter. But that may be way cheaper in the USA.
The additive was approx 11 $ and the synthetic was made of gold, 60$ a liter. But that may be way cheaper in the USA.
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Instructor
Joined: Oct 2005
Posts: 139
Likes: 0
From: Creve Coeur Missouri
I looked on Mobil's web site and they say for their synthetic 75w-90 gear lube ,it already has LS(limited slip) additives in it. Says only need to add LS additive for extreme duty,and is compatible with their lube. I'm changing mine too. Bought that Mobil 1 synthetic and tube of additive at Advanced Auto Parts. Autozone sells additive as well . In blue tube made by K&W , has 7 oz. Less than $5! Also says meets GM specs . The owners manual for my'89 says use 4oz. of additive.
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
You need to buy two quarts and you will have about half a quart leftover for next time.
Last time this topic turned a little ugly.
According to my FSM the D44s and D36s have the same fluid capacity.
Last time this topic turned a little ugly.
According to my FSM the D44s and D36s have the same fluid capacity.