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LTb1ow
06-02-2009, 11:16 AM
Since I am in the fluid changing mood today, figure I should change the rear end fluid. I have never changed it since I got the car, so might as well.

Question is what fluid do I use and how much?
sweetbmxrider
06-02-2009, 12:29 PM
didn't i tell you not to long ago?
sweetbmxrider
06-02-2009, 12:36 PM
Fluid Type
Standard Differential

* SAE 80W-90 GL-5 gear lubricant

Limited Slip Differential

* Lubricant additive (GM P/N 1052358) and
* SAE 80W-90 GL-5 gear lubricant

Capacity
Drain and Refill 1.7 liters (3.5 pt)
Additive 118 milliliters (4 fl oz)

here

gm gear oil p/n - 12345977
LTb1ow
06-02-2009, 12:58 PM
Ah cool!

Thanks!

Would an pepboys/autozone have that stuff?
Mike
06-02-2009, 01:06 PM
pepboys/zone will have rear end fluid and a fake version of the additive. but your best bet is to get the additive at the dealer (i bought some last week and it was 11 bucks and change) and get your gear oil at any store you want
LTb1ow
06-02-2009, 01:10 PM
Ok, sounds good, will I get strange looks at dealer?

Always seem to when I get things for my car there... lol
Mike
06-02-2009, 01:12 PM
no, just go to the parts counter and ask for "limited slip additive" they should have a box of the little bottles. then just put the full bottle in with your fluid change and you will be good to go
LTb1ow
06-02-2009, 01:13 PM
K thanks!

With the TA covers, I just fill it to the top vent correct?
LTb1ow
06-02-2009, 01:22 PM
Ok sounds good, I think...

I prob am over thinking this. lol

Maybe a tmmr project or this weekend.
Mike
06-02-2009, 01:26 PM
only takes a few minutes, it should be a 3/8th's drive to get the fill plug out, its much easier to drain if you have an aftermarket cover......dunno if you do or not?
LTb1ow
06-02-2009, 01:27 PM
Yea I do, sorry, I mentioned TA, figured that woulda conveyed it.
Mike
06-02-2009, 01:32 PM
i failed at reading your post. the ta cover makes it easy as hell, theres an allen screw at the bottom for drain, and one at the top for fill. but you still need to open the factory fill plug to get the right oil level....

fill it until the oil starts to come out of the factory fill hole.
LTb1ow
06-02-2009, 01:33 PM
Oh ok, so drain it, and then fill it with the upper most allen screw until it comes out the next lower hole?

I have never really looked at the cover so pardon my questions.
sweetbmxrider
06-02-2009, 01:53 PM
no its on the differential. the factory plug is just a 3/8's drive. take that out, fill in the top bolt on the cover, and stop when it comes out of the factory fill.
LTb1ow
06-02-2009, 02:28 PM
Ah ok, well I guess it will be interesting... prob end up making a mess.
Mike
06-02-2009, 02:51 PM
Ah ok, well I guess it will be interesting... prob end up making a mess.

look right above the axle tube on the passenger side of the housing, there will be a plug with a square hole.......that hole will accept a 3/8ths ratchet (probably need an extention). thats your fill hole. you can fill from there or from the top hole on the cover. but either way you have to open the factory hole so you know when the rear has enough fluid in it
Whiplash Performance
06-02-2009, 04:35 PM
Rear fluid is the best smelling stuff around. So use some clothing you never want to wear again or else chicks will not want to come anywhere near you. I know from experience. lol
Camaro.Joe.LT1
06-02-2009, 06:06 PM
Replaced mine with Mobil 1 75w90 full synthetic gear oil $10.00 per qt. at autozone it has a limited slip additive built in. I also replaced my cover nothing fancy just a stock cover, about 10 bucks rock auto mail order. To fill the rear it took 1 3/4 quarts.
EchoMirage
06-02-2009, 06:53 PM
i prefer amsoil severe gear 75w90. it doesnt need an LSD additive. if you want, you can not use the additive, and it will tighten up your diff some. people have road raced for years without the additive, and have had no ill effects. try redlines line of NS fluids....as in non-synthetic, and without the friction modifier.
LTb1ow
06-02-2009, 07:02 PM
Yea, I will take another trip down to the Zone and bug BiGal for some rear fluid.
sab123
06-04-2009, 05:47 PM
i prefer amsoil severe gear 75w90. it doesnt need an LSD additive. if you want, you can not use the additive, and it will tighten up your diff some. people have road raced for years without the additive, and have had no ill effects. try redlines line of NS fluids....as in non-synthetic, and without the friction modifier.

It depends on the type of limited slip. Torsen says that their doesn't need the additive but when I didn't put it in, I've had one wheel spinning a lot. Ever since I use the Redline 75w90 that already has the additive in it.
WildBillyT
06-04-2009, 05:50 PM
i prefer amsoil severe gear 75w90. it doesnt need an LSD additive. if you want, you can not use the additive, and it will tighten up your diff some. people have road raced for years without the additive, and have had no ill effects. try redlines line of NS fluids....as in non-synthetic, and without the friction modifier.

Is that a climbing gear lube?
BigAls87Z28
06-04-2009, 08:29 PM
Fake posi additive? Whats fake about it?
I used the TransX Limited Slip additive we sell at work, and it works fine. A little wine, but I think that I might need to add a bit more fluid...
Formulalt1
06-04-2009, 08:49 PM
It depends on the type of limited slip. Torsen says that their doesn't need the additive but when I didn't put it in, I've had one wheel spinning a lot. Ever since I use the Redline 75w90 that already has the additive in it.
Thats cause there are no posi clutches in a torsen and you have one wheel spin on a torsen unit?. A Torsen is basically a locker.