Recent Topics
Sweden Trials Electric Higway for Trucks
by Y_K
46 minutes 35 seconds ago
17 yo deutsch filter?
by robo339
Yesterday at 11:07 PM
Ford Focus wrecked
by tig1
Yesterday at 10:13 PM
Valvoline Maxlife vs Supertech Synthetic vs QSED
by mazdamonky
Yesterday at 09:56 PM
Lexus seats in a Camry
by Nick1994
Yesterday at 09:52 PM
shop rechecking work after front end parts replace
by motor_oil_madman
Yesterday at 09:50 PM
M1-EP vs vanilla M1
by Atomic
Yesterday at 09:29 PM
Supertech Synthetic and Citgo
by RRLJR
Yesterday at 09:28 PM
Gun Belt Wanted
by FirstNissan
Yesterday at 08:24 PM
car wash soap for pressure washer
by Donald
Yesterday at 08:16 PM
Deep tranny pan worth it?
by rsylvstr
Yesterday at 07:20 PM
Which oil for my old BMW and why?
by fdcg27
Yesterday at 06:20 PM
Newest Members
Josh_Westwood, Brogan, Superlatives, Ruturaj, derfderfgoose
58280 Registered Users
Who's Online
26 registered (CR94, bbhero, Chewie, DeafBrad, 76sixer, Boczech), 1091 Guests and 16 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58280 Members
66 Forums
250854 Topics
4111660 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#1034311 - 11/24/07 11:41 PM Diff oil and transfer case fluid for 1999 Suburban
TylerL Offline


Registered: 11/19/07
Posts: 308
Loc: Mishawaka, IN
This is my first post and I'm so glad I can be apart of BITOG.
My friend just bought a 1999 Chevy Suburban 4x4 1500.
He's not much of a preventive maintenance person when it comes to his 6 vehicles, 4 of which are Suburbans (79,85,89,99). He doesn't even wash any of his trucks. I hope I can get him to wash his 1999 because all that dirt just causes rust around the wheel wells.

On to my questions. I think both differentials need their lube changed but not sure what to use. What gear lube should I use? I'm thinking Mobile 1 75-90.

I don't know what fluid the transfer case takes or how much to use. But I do know it's electronically operated.

Any Advice on how to change either of these would be good but don't really worry about it.

Top
#1034499 - 11/25/07 01:19 PM Re: Diff oil and transfer case fluid for 1999 Suburban [Re: TylerL]
artificialist Offline


Registered: 09/23/07
Posts: 8089
Loc: Florida
Get the manual that is stashed away in the glove box. Look up the fluid section. If it calls for SAE90, SAE85w90, SAE80w90, or SAE75w90, Mobil1 75w90 will be perfect. If it calls for SAE85w140, SAE 80w140, or SAE 75w140, buy Mobil1 75w140.

Transfer cases wary widely in the fluid type they take. Check that owner's manual, and if it says to use Dexron I, II, or III, fill it with Dexron III or VI. If it says gear oil, use the correct viscosity. Sometimes the transfer case takes a dealer-only fluid. In those cases, don't take chances, buy the dealer-only fluid.
_________________________
2010 Lancer Ralliart Sportback

Top
#1035232 - 11/26/07 03:04 PM Re: Diff oil and transfer case fluid for 1999 Suburban [Re: artificialist]
TylerL Offline


Registered: 11/19/07
Posts: 308
Loc: Mishawaka, IN
Thanks
I'll check but I think it takes the dealer fluid.

Top
#1035396 - 11/26/07 06:55 PM Re: Diff oil and transfer case fluid for 1999 Suburban [Re: TylerL]
MolaKule Offline


Registered: 06/05/02
Posts: 17247
Loc: Iowegia - USA
I would use any modern 75W90 for the front differential and Amsoil's 75W110 for the rear differential.
_________________________
Somehow your attitude seems to have improved after, but not before, my last cup of coffee. smile

Top
#1035758 - 11/27/07 10:05 AM Re: Diff oil and transfer case fluid for 1999 Suburban [Re: MolaKule]
racer12306 Offline


Registered: 10/06/05
Posts: 2049
Loc: Baltimore, MD
Many of the electronically shifted transfer cases on the GM 4wd trucks take a fluid that is available at the dealer, and it aint cheap.
_________________________
04 Dodge Neon SXT/2.0/MTX/PUP 5w20/Fram Ultra/5000 miles for now

12 Chrysler T&C/3.6/6A/5w30PU/PureONE/OLM

Top
#1035949 - 11/27/07 02:38 PM Re: Diff oil and transfer case fluid for 1999 Suburban [Re: racer12306]
TylerL Offline


Registered: 11/19/07
Posts: 308
Loc: Mishawaka, IN
Thanks molakule, I'll tell my friend that.
I found the name of the fluid you guys are talking about. It's called Auto-trak II and people said it's about $6-$9 dollars a quart. The case takes less than two quarts. I think it was used in place of ATF in gm transfer cases with an auto 4x4 mode. Using the auto-trak fluid in these transfer cases eliminates unwanted clutch grad or whatever you call it. According to wikipedia it was an added option on the suburban starting in 1998.
I'm not quite sure how much of what I said is totally accurate.

Top