Recent Topics
High Lead Redline 5W40 thoughts? Ty
by Pajero
06/22/18 09:40 PM
Source of the Mighty Columbia River
by Snagglefoot
06/22/18 09:32 PM
Sparking discussion - excellent article
by JLTD
06/22/18 09:23 PM
Ethylene Glycol Long Life Coolant for KUBOTA
by pburchett
06/22/18 09:11 PM
Mobil 1 5W-30, 6,200 mi, 2017 2.3 EB Explorer
by Whimsey
06/22/18 08:48 PM
Chevron 10w-40, 97 Nissan Maxima, 3000 miles
by OilGeek91
06/22/18 08:36 PM
Old green antifreeze in garage storage is gelling
by JLawrence08648
06/22/18 08:32 PM
VWs at Pick n Pull
by Eric Smith
06/22/18 08:17 PM
Rotella CK-4 destroys the flat tappet
by Gokhan
06/22/18 08:12 PM
Breaking in new short block
by Bub
06/22/18 07:00 PM
Should I buy a mill or a drill press?
by Vern_in_IL
06/22/18 06:32 PM
Weber Q300 Grill Parts Help
by gathermewool
06/22/18 05:24 PM
I Had To Tell Somebody- Banquet
by Zee09
06/22/18 05:13 PM
Xfinity mobile cell service
by jay929
06/22/18 04:37 PM
Fuse "failure"
by dlundblad
06/22/18 04:32 PM
Do you Bluetooth your phone and car?
by ZZman
06/22/18 04:20 PM
Hastings air filters
by Spitter
06/22/18 04:18 PM
2011 Town and Country remote started itself.
by mrsilv04
06/22/18 04:06 PM
Vaughan Hammer and Superbar $10 Sam's
by hatt
06/22/18 04:03 PM
Denso Oil filter - outsourced / quality changed
by 92saturnsl2
06/22/18 02:37 PM
Newest Members
azzid0906, OilGeek91, DRancher, Newuser, Varbill
65299 Registered Users
Who's Online
94 registered (69Torino, 01rangerxl, 4WD, Ag76, 9050lx, 10 invisible), 1433 Guests and 44 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65299 Members
67 Forums
285804 Topics
4769738 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 2 1 2 >
Topic Options
#4652526 - 01/31/18 07:52 PM Fluid for G80 rear end in 02 silverado?
Sealbilly Offline


Registered: 07/02/16
Posts: 165
Loc: EasTn
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?

Top
#4652597 - 01/31/18 08:42 PM Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly]
clinebarger Online   content


Registered: 12/19/13
Posts: 1915
Loc: Fort Worth, Texas
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.......


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/Auto

Top
#4652600 - 01/31/18 08:44 PM Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly]
WishIhadatruck Offline


Registered: 05/09/06
Posts: 1397
Loc: Grand Rapids, MI
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

Top
#4652605 - 01/31/18 08:48 PM Re: Fluid for G80 rear end in 02 silverado? [Re: WishIhadatruck]
clinebarger Online   content


Registered: 12/19/13
Posts: 1915
Loc: Fort Worth, Texas
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/Auto

Top
#4652674 - 01/31/18 09:47 PM Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly]
Sealbilly Offline


Registered: 07/02/16
Posts: 165
Loc: EasTn
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.

Top
#4652703 - 01/31/18 10:19 PM Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly]
barkingspider Offline


Registered: 12/22/13
Posts: 2049
Loc: socal
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
_________________________
06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)

Top
#4652706 - 01/31/18 10:25 PM Re: Fluid for G80 rear end in 02 silverado? [Re: clinebarger]
4WD Online   confused


Registered: 09/21/10
Posts: 6395
Loc: Texas
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

Top
#4652714 - 01/31/18 10:35 PM Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly]
KneeGrinder Offline


Registered: 11/28/17
Posts: 221
Loc: North of you Idaho
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!


Edited by KneeGrinder (01/31/18 10:40 PM)
_________________________
08 Tribeca 82k PUP 5w30 wix
06 Accord Hybrid 131k PUP 5w20 wix
02 Chevy k3500 97k Delvac 1 esp 5w40 wix
00 F350 133k Delvac 1300 15w40 wix

Top
#4652739 - 01/31/18 11:06 PM Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly]
clinebarger Online   content


Registered: 12/19/13
Posts: 1915
Loc: Fort Worth, Texas
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/Auto

Top
#4652965 - 02/01/18 09:40 AM Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly]
Rat407 Offline


Registered: 12/13/02
Posts: 1431
Loc: North Carolina
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

Top
#4653157 - 02/01/18 12:47 PM Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly]
joegreen Offline


Registered: 03/10/13
Posts: 760
Loc: NY
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
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le

Top
#4653897 - 02/02/18 12:08 PM Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
G80 diffs must have changed at some point. All of mine have metal warning tags on them that additive must be used.
_________________________
07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio

Top
#4654015 - 02/02/18 03:12 PM Re: Fluid for G80 rear end in 02 silverado? [Re: Sealbilly]
Silverado12 Offline


Registered: 02/26/13
Posts: 3114
Loc: Central Virginia
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.


Edited by Silverado12 (02/02/18 03:12 PM)
_________________________
12 Chevy Silverado ext. cab LS, 2WD 4.3 auto
16 Challenger R/T Shaker 5.7 manual B5 blue
07 Harley Dyna Street Bob 96 c.i. 6 sp.
00 Mustang GT auto

Top
#4654058 - 02/02/18 04:24 PM Re: Fluid for G80 rear end in 02 silverado? [Re: joegreen]
clinebarger Online   content


Registered: 12/19/13
Posts: 1915
Loc: Fort Worth, Texas
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/Auto

Top
#4654121 - 02/02/18 05:23 PM Re: Fluid for G80 rear end in 02 silverado? [Re: DoubleWasp]
Rhymingmechanic Offline


Registered: 08/13/04
Posts: 1327
Loc: VA
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.

Top
Page 1 of 2 1 2 >