C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

[Question] Rear Diff Fluid

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Old Jul 9, 2002 | 10:07 PM
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Mike in Boston's Avatar
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Default [Question] Rear Diff Fluid

I checked 2 different places about the rear diff fluid. It says 1 12oz bottle of GM gear lube and 1 12oz bottle of GM friction additive.

So 24oz total? Seems a little low.

Any thoughts?

-Mike
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Old Jul 9, 2002 | 10:08 PM
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I want to say it is 2 Big bottles of gear oil, 1 small bottle of additive. The only problem is I can't remember if the big bottles are quarts or not.
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Old Jul 9, 2002 | 10:10 PM
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Default Re: (scorp508)

Ok my http://www.alldata.com account says 1.5 liters which is 3.2 pints. There are 2 pints to a quart.
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Old Jul 9, 2002 | 10:11 PM
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Default Re: [Question] Rear Diff Fluid (Mike in Boston)

I just got about 2qts in my Dana 36 rear end this weekend. I did the siphon approach so you don't get it all out. I beleive 2 qts is enough with that approach. But 12oz of gear oil to 12oz of friction modifier sounds steep. I thought 2qts gear oil and 1 small bottle of modifier. Maybe someone else will chime in. I used Redline Synthetic and it already has the additive mixed in.
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Old Jul 9, 2002 | 10:12 PM
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Default Re: (scorp508)

1.8 quarts of gear lube, plus the small bottle of GM additive. Just did mine this weekend with Mobil 1: sweet combo.
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Old Jul 9, 2002 | 10:46 PM
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Default Re: (darkcarn85)

Ok, I'll check the local shop for Red Line with the additive already added. If they dont have it I'll go for the Mobil1 with the GM additive. Does Pep-Boys carry the additive?

Also, are there different weights for gear lube?

-Mike
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Old Jul 9, 2002 | 11:02 PM
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Default Re: (Mike in Boston)

...If they dont have it I'll go for the Mobil1 with the GM additive. Does Pep-Boys carry the additive?

Also, are there different weights for gear lube?
I just stop by the dealer and pay the list price. I've had troubles in the past with sticky limited slip, for all the work, I figure the extra cost is worth it. The Mobil1 only comes in 75W-90, I've been using in other cars for years with no troubles.

Eric
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Old Jul 9, 2002 | 11:22 PM
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Default Re: (Mike in Boston)

Just get the Redline. Its all you will need and you won't regret it. Even if you have to order it off the internet and wait for it to be shipped. I drained the rear end on the 86 two years ago and replace what ever was in there with the Redline. The car had 125K on it when I bought it. The rear end got quieter and the limited slip works much better. I autocross and do high speed track events so the car sees a lot of hard use.
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Old Jul 10, 2002 | 12:14 AM
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Default Re: (96LT1)

I also have thr Redline w/ GM additive too!!!
Matt
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Old Jul 10, 2002 | 06:30 AM
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Default Re: (96LT1)

Just get the Redline. Its all you will need and you won't regret it. Even if you have to order it off the internet and wait for it to be shipped
Hey Mike,

There is a place out here in manassas, off of Ballsford Rd. called OGracing? They seem to specalize in Porshe racing equipment, but anyhow they carry Redline products. I got the waterwetter from them for $6.49 a bottle. If I had known about them when I did my rear end change, I would have got the redline fluid from them. By the way, Justin (at Zip) recmonded the GM factory oil and additive, unless I went Redline. It was his opinion that it was not a good idea to buy a syn. base oil and a mineral based additive.
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Old Jul 10, 2002 | 10:14 AM
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Default Re

I just did this on Monday.

I purchased 3 bottles of GM Lube + 1 bottle of GM posi additive. It was about $30 from the dealer.

I think I used about 2 1/2 bottles of the lube in the rear.

Vic
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Old Jul 10, 2002 | 10:20 AM
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Default Re: (Red 86 4+3)

There is a place out here in manassas, off of Ballsford Rd. called OGracing?
They are a pretty good bunch of guys. Their prices can be a little above normal but if you want something right now they normally have it. I got the rear end lube and p/s fluid from them the last time I needed it.
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Old Jul 10, 2002 | 02:01 PM
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Default Re: (96LT1)

Thanks for the advice guys, I'll be picking up what I need today.

-Mike
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Old Jul 11, 2002 | 06:52 AM
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Default Re: (Mike in Boston)

Hey Mike in Boston,

I think the GM bottles are 23 oz each. Now that is pulling from memory. And you dont have to go to a chevy dealer. Any GM dealer will have it. Good luck
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