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#4673844 - 02/21/18 08:40 PM Avalanche front and rear diff change.
spasm3 Offline


Registered: 05/30/10
Posts: 8662
Loc: North Carolina
Going to change the diff oil , looking at amsoil severe gear 75w90 for both the front and rear. G80 rear, apparently i don't need Ls additive.

My local AA carries valvoline syn autotrak fluid for the transfer case.

Any suggestions? Anything i should use other than above?

Thanks.

EDIT: No where can i find how much each diff takes, so i don't know how much to buy. Anyone guess how much i need?


Edited by spasm3 (02/21/18 08:42 PM)
_________________________
13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4673862 - 02/21/18 08:59 PM Re: Avalanche front and rear diff change. [Re: spasm3]
donnyj08 Offline


Registered: 08/12/12
Posts: 3034
Loc: Cincinnati
Originally Posted By: spasm3
Going to change the diff oil , looking at amsoil severe gear 75w90 for both the front and rear. G80 rear, apparently i don't need Ls additive.

My local AA carries valvoline syn autotrak fluid for the transfer case.

Any suggestions? Anything i should use other than above?

Thanks.

EDIT: No where can i find how much each diff takes, so i don't know how much to buy. Anyone guess how much i need?


In my silverado ive done two changes. First at 25k with valvoline synpower 75w90 front and rear. Second at 65k with castrol syntex 75w90 front and rear.

I change my diffs every 40-50k. Transfer case once per year.


Edited by donnyj08 (02/21/18 08:59 PM)
_________________________
2008 Silverado Z71 LT 90k Maxlife FS 5w30
2010 Ford Escape 167k QSUD 5w20
2016 Yamaha XSR900 11.5k, Rotella 15w40 Yamaha Filter.

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#4673870 - 02/21/18 09:11 PM Re: Avalanche front and rear diff change. [Re: spasm3]
spasm3 Offline


Registered: 05/30/10
Posts: 8662
Loc: North Carolina
Donnyj08, how much did it take? how much do i need for each diff?

Thanks.
_________________________
13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4673895 - 02/21/18 09:38 PM Re: Avalanche front and rear diff change. [Re: spasm3]
gman2304 Offline


Registered: 08/11/11
Posts: 3057
Loc: n.c.
My 2005 Avalanche with the G80 calls for 2.1 qts. I would add 2 qts and check with the pinkie. You want it a little below the fill hole. My Avalanche is a two wheel drive, can’ t help you with the front. P.S. You need to drive yours more! Mine just rolled over 194,000 miles. wink


Edited by gman2304 (02/21/18 09:48 PM)

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#4673941 - 02/21/18 10:43 PM Re: Avalanche front and rear diff change. [Re: spasm3]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1762
Loc: Alberta
All sounds good but confirm your 4 wheel drive knob has an “ Auto “ setting. If it does, it takes Auto Trak II like you were planning.

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#4674103 - 02/22/18 07:50 AM Re: Avalanche front and rear diff change. [Re: spasm3]
barkingspider Offline


Registered: 12/22/13
Posts: 2049
Loc: socal
Any 75w90 will work. You may want to get 5 qts (a little more than 2qts for both front and rear). And I would go to the dealer for transfer case fluid,they will give you the correct fluid ad amount
_________________________
06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)

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#4675335 - 02/23/18 10:22 AM Re: Avalanche front and rear diff change. [Re: spasm3]
donnyj08 Offline


Registered: 08/12/12
Posts: 3034
Loc: Cincinnati
Originally Posted By: spasm3
Donnyj08, how much did it take? how much do i need for each diff?

Thanks.


Get 3 for the rear and 2 for the front. The rear will take 2.4 or so. The front about 1.7 in my experience.

That will leave you with extra.


Edited by donnyj08 (02/23/18 10:23 AM)
_________________________
2008 Silverado Z71 LT 90k Maxlife FS 5w30
2010 Ford Escape 167k QSUD 5w20
2016 Yamaha XSR900 11.5k, Rotella 15w40 Yamaha Filter.

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#4675504 - 02/23/18 01:06 PM Re: Avalanche front and rear diff change. [Re: spasm3]
Click Offline


Registered: 03/24/04
Posts: 87
Loc: minnesota
Amsoil's lookup is pretty cool and simple to use.

https://www.amsoil.com/lookup/auto-and-light-truck/

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