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PostPosted: Tue May 26, 2009 9:18 am 
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GM gov-lock LSDs don't require the additive.

I just used the cheap 80w90 lube. I think it was Havoline or even AutoZone's house brand. This truck is old, has a ton of miles, and likely won't be around for long. I just needed cheap lube to get it back on the road with no drips in the garage.

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PostPosted: Tue May 26, 2009 7:20 pm 
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Gov Locs DO require additive. Any Clutch Style Posi requires it. Gm Part number you need is 992694. I even just checked my Gear Centre Parts Manual. Its a must. You can use the Ford Racing stuff to, M-19546-A1.

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PostPosted: Tue May 26, 2009 7:52 pm 
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I highly doubt it has a LSD, unless it's a Z71. Most normal 4x4's didn't, AFAIK. I know my 98 didn't, and most trucks of that era didn't.

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PostPosted: Tue May 26, 2009 8:13 pm 
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depends on the year/towing package too Ed, 3.42 LSD is pretty common as well as 3.73

I believe the RPO code is G80 or something like that for a 3.42

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PostPosted: Tue May 26, 2009 8:14 pm 
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I know my Tahoe had 3.73's with an open diff. Thing was a one wheel wonder. IIRC, the code was GT4, but I could be wrong.

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PostPosted: Tue May 26, 2009 8:24 pm 
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PostPosted: Tue May 26, 2009 8:29 pm 
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GT4 ; AXLE REAR 3.73 RATIO
G80 ; AXLE POSITRACTION LIMITED SLIP


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PostPosted: Tue May 26, 2009 8:31 pm 
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Yes, you're right it is the G80 RPO code. And, I do have it.

Based on what I've been told from all the people at the GM truck forum, you do NOT need the additive. They said whenever they replace a gasket or fluid they just top it off with the cheap stuff off the shelf (80W90 in this case).

Honestly, I probably won't bother with the additive. The truck has 214,000. The rear diff is original. If it goes out, it goes out. I don't think it'd be from a lack of additive. The leak has subsided too. Now, I just have a really bad rear main seal leak.

Just gonna drive her the way she is for another year or so...

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PostPosted: Tue May 26, 2009 8:47 pm 
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Thats odd that they would tell you that it isn't required lol, it cost 5 bux, and is a cheap insurance policy. At that kinda mileage, hard to say what kinda shape the clutches are in. Torsen style LSDs are the only type that don't require it.

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PostPosted: Tue May 26, 2009 8:53 pm 
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Hmm... for 5 bucks, my mind could be changed. lol If it doesn't need it (based on what they're saying) would it do any harm in having it in there?

Is it a dealer-only item?

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PostPosted: Tue May 26, 2009 8:53 pm 
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No, it's just an additive, available at any parts store. You may have to drain some of the fluid you put in, however.

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PostPosted: Tue May 26, 2009 8:55 pm 
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Its called a friction modifier.

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PostPosted: Tue May 26, 2009 9:08 pm 
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How many ounces is it?

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PostPosted: Tue May 26, 2009 9:43 pm 
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comes in the same size bottle as Supercharger oil. you can buy it at most auto parts stores, Napa, Autozone..maybe...
Gm under that number i gave you, ford under the other number i gave you.

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PostPosted: Wed May 27, 2009 9:22 am 
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The main purpose of the additive is to promote slippage of the discs during differential movement ie. turns, in order to prevent chatter and reduce heat build up.

It is required with all clutch, friction disc type limited slips.
Can't use it in our trani's with ATF. Our discs are way too small to matter.

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PostPosted: Wed May 27, 2009 9:47 am 
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I don't think the G80 is a clutch based limited slip, but an actual locker, which is why it doesn't require a friction modifier.

I have a friend with a Tahoe that has broken three of them in the last few months because they aren't that strong off road, the most recent was about two weeks ago and we ordered him a Detroit TruTrac diff. When we were looking at the G80 diff, I didn't see any clutches anywhere, only some springs, weights, and the locking teeth.

( not saying for you to get a Detroit, just saying what he did )

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PostPosted: Wed May 27, 2009 8:42 pm 
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Isn't the G80 an electronic locker? I know the one in our Duramax powered truck is.

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PostPosted: Wed May 27, 2009 8:46 pm 
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g80 has been the rpo code for years. it might have been upgraded to electronic but it hasn't always been

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PostPosted: Wed May 27, 2009 9:58 pm 
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There's nothing electronic about mine.

Matt any comments on what Ryan said? That's the same thing I was told at the GMtruckforum.com too.

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PostPosted: Thu May 28, 2009 9:25 am 
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After doing some more looking, it seems that there IS clutches with the G80 diff, they are behind the axle gears.

My apology for the misinformation earlier :ack:

There is an exploded view of a G80 in this thread http://www.dieselplace.com/forum/showth ... ?p=2522117

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