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Avalanche front and rear diff change. #4673844
02/21/18 09:40 PM
02/21/18 09:40 PM
Joined: May 2010
Posts: 9,046
North Carolina
spasm3 Offline OP
spasm3  Offline OP
Joined: May 2010
Posts: 9,046
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?

Last edited by spasm3; 02/21/18 09:42 PM.

13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: Avalanche front and rear diff change. [Re: spasm3] #4673862
02/21/18 09:59 PM
02/21/18 09:59 PM
Joined: Aug 2012
Posts: 3,041
Cincinnati
donnyj08 Offline
donnyj08  Offline
Joined: Aug 2012
Posts: 3,041
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.

Last edited by donnyj08; 02/21/18 09:59 PM.

2008 Silverado Z71 LT 90k Maxlife FS 5w30
2010 Ford Escape 172k QSUD 5w20
2016 Yamaha XSR900 12k, Rotella 15w40 Yamaha Filter.
Re: Avalanche front and rear diff change. [Re: spasm3] #4673870
02/21/18 10:11 PM
02/21/18 10:11 PM
Joined: May 2010
Posts: 9,046
North Carolina
spasm3 Offline OP
spasm3  Offline OP
Joined: May 2010
Posts: 9,046
North Carolina
Donnyj08, how much did it take? how much do i need for each diff?

Thanks.


13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: Avalanche front and rear diff change. [Re: spasm3] #4673895
02/21/18 10:38 PM
02/21/18 10:38 PM
Joined: Aug 2011
Posts: 3,157
n.c.
gman2304 Offline
gman2304  Offline
Joined: Aug 2011
Posts: 3,157
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

Last edited by gman2304; 02/21/18 10:48 PM.
Re: Avalanche front and rear diff change. [Re: spasm3] #4673941
02/21/18 11:43 PM
02/21/18 11:43 PM
Joined: Dec 2017
Posts: 2,314
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,314
SE British Columbia, Canada
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.


If you want the job done right......do it yourself.
Re: Avalanche front and rear diff change. [Re: spasm3] #4674103
02/22/18 08:50 AM
02/22/18 08:50 AM
Joined: Dec 2013
Posts: 2,088
socal
barkingspider Offline
barkingspider  Offline
Joined: Dec 2013
Posts: 2,088
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)
Re: Avalanche front and rear diff change. [Re: spasm3] #4675335
02/23/18 11:22 AM
02/23/18 11:22 AM
Joined: Aug 2012
Posts: 3,041
Cincinnati
donnyj08 Offline
donnyj08  Offline
Joined: Aug 2012
Posts: 3,041
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.

Last edited by donnyj08; 02/23/18 11:23 AM.

2008 Silverado Z71 LT 90k Maxlife FS 5w30
2010 Ford Escape 172k QSUD 5w20
2016 Yamaha XSR900 12k, Rotella 15w40 Yamaha Filter.
Re: Avalanche front and rear diff change. [Re: spasm3] #4675504
02/23/18 02:06 PM
02/23/18 02:06 PM
Joined: Mar 2004
Posts: 87
minnesota
Click Offline
Click  Offline
Joined: Mar 2004
Posts: 87
minnesota
Amsoil's lookup is pretty cool and simple to use.

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


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