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Fluid for G80 rear end in 02 silverado? #4652526 01/31/18 07:52 PM
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Sealbilly Offline OP
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Can't find a definite answer. Rear end code says my truck has a G80 limited slip 342 gear differential. But have read not to use fluid with LS additive, other places say yes use LS additive. Even read a notice from chevy saying not to but have heard that a new notice has been put out since then. It calls for synthetic 75w90 but since idk what the heck to put in it I opened her up sprayed her out with parts cleaner and refilled with 80w90 conventional valvoline. Two quarts without LS additive and almost a whole nother quart with LS additive. Since I cleaned it out I will just drain and refill if I have find out what in the world is supposed to be used in it.

Anyone know for sure?

Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly] #4652597 01/31/18 08:42 PM
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clinebarger Offline
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You "can" run a LS fortified fluid, But technically it doesn't call for it.

Mobil Delvac 1 75w90 or Redline 75w90NS are the fluids I would run in a Gov-Loc.


The LS gear oils don't usually have enough LS additive in them for aftermarket high performance clutch type posi's.....I don't think "most of a quart" will matter.......

Last edited by clinebarger; 01/31/18 08:45 PM.

2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly] #4652600 01/31/18 08:44 PM
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WishIhadatruck Offline
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I think it is a locker, not a clutch type limited slip. So, it does not need the LS additive, but being in the fluid will not affect it. You should be fine. I think the GM fluid calls for synthetic however as you state. I prefer Amsoil 75W-110. If you're not towing, not having synthetic probably won't hurt. If you tow, better put the synthetic in.


1996 Buick Roadmaster Wagon
2014 Cruze Eco Manual
2003 2500 Suburban, 8.1L
Re: Fluid for G80 rear end in 02 silverado? [Re: WishIhadatruck] #4652605 01/31/18 08:48 PM
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clinebarger Offline
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Originally Posted By: WishIhadatruck
I think it is a locker, not a clutch type limited slip. So, it does not need the LS additive, but being in the fluid will not affect it. You should be fine. I think the GM fluid calls for synthetic however as you state. I prefer Amsoil 75W-110. If you're not towing, not having synthetic probably won't hurt. If you tow, better put the synthetic in.


While it is a technically a Locker.....It does have Clutches, They are just never engaged during a turn & don't need the Anti-Chatter LS additive.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly] #4652674 01/31/18 09:47 PM
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Sealbilly Offline OP
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Thanks gentlemen. I don't think it is locking the way it should as it sometimes is a one wheel wonder even in a strait line.

Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly] #4652703 01/31/18 10:19 PM
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barkingspider Offline
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I have had and still have trucks w the g80 rear diff and they do not require LS fluid. You can use any 75w90 or 80w90 in it. I have used both types and it ran normal zero problems


04 Avalanche Z71 4x4
Re: Fluid for G80 rear end in 02 silverado? [Re: clinebarger] #4652706 01/31/18 10:25 PM
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4WD Online Confused
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Originally Posted By: clinebarger
You "can" run a LS fortified fluid, But technically it doesn't call for it.

Mobil Delvac 1 75w90 or Redline 75w90NS are the fluids I would run in a Gov-Loc.


The LS gear oils don't usually have enough LS additive in them for aftermarket high performance clutch type posi's.....I don't think "most of a quart" will matter.......


Using Mobil Delvac 1 in my G80 for two years now smooth as silk and pulls on both wheels in sand/dirt/mud

Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly] #4652714 01/31/18 10:35 PM
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KneeGrinder Offline
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I've been using mobil 1 75w90 ls syn front and rear in mine for 10 years. G 80 rear.

Mine drives all four tire till one spins in front, then I just have three and it turns hard!

Last edited by KneeGrinder; 01/31/18 10:40 PM.

08 Tribeca 90k PUP 5w30
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Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly] #4652739 01/31/18 11:06 PM
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clinebarger Offline
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Originally Posted By: Sealbilly
Thanks gentlemen. I don't think it is locking the way it should as it sometimes is a one wheel wonder even in a strait line.


How do you know it still has it's Gov-Loc? It wouldn't be the first 8.5"/8.6" differential to have catastrophic failure of the Eaton Governor Locker & a open differential installed.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly] #4652965 02/01/18 09:40 AM
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I run AMSOIL's Severe Gear 75w-90 in my 02's diffs, I tow and have 177k on the vehicle. Sent a sample off that the fluid had 90,516 miles on it.



2002 Silverado 5.3 0w-20 AMSOIL
Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly] #4653157 02/01/18 12:47 PM
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joegreen Offline
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If its a gov lock locker you do not need a limited slip fluid. There are no clutches in that type of locker.


1978 Chevrolet k20
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1984 Mercedes-Benz 300 turbo diesel
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Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly] #4653897 02/02/18 12:08 PM
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DoubleWasp Offline
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G80 diffs must have changed at some point. All of mine have metal warning tags on them that additive must be used.


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Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly] #4654015 02/02/18 03:12 PM
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Silverado12 Offline
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I have a 2012 Silverado and am using straight non-synthetic 80W-90 in it and I tow heavy stuff too. Works well from what I can tell. FWIW mine doesn't have any warnings on it.

Last edited by Silverado12; 02/02/18 03:12 PM.

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Re: Fluid for G80 rear end in 02 silverado? [Re: joegreen] #4654058 02/02/18 04:24 PM
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clinebarger Offline
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Originally Posted By: joegreen
If its a gov lock locker you do not need a limited slip fluid. There are no clutches in that type of locker.


They do use clutches, But you are correct on them not needing LS additive.



2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Fluid for G80 rear end in 02 silverado? [Re: DoubleWasp] #4654121 02/02/18 05:23 PM
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Rhymingmechanic Offline
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Originally Posted By: DoubleWasp
G80 diffs must have changed at some point. All of mine have metal warning tags on them that additive must be used.


My understanding is that G80 is an option code. Depending on the axle or vehicle, that could mean the mechanism is either a limited-slip or a gov-lock.

One of my earliest posts was about the arcane GM spec number for axle fluid in my 2001 Silverado. It had the grape-scented special sauce from the factory. I ended up replacing it with Amsoil Severe Gear 75W-90, and the locker has continued to work for the last 70,000 miles.

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