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Username Post: Rear Differential Fluid Recommended And Change Intervals 07 Silverado        (Topic#253746)
hhouser 
Forum Newbie
Posts: 14

Reg: 11-28-10
12-03-10 06:05 AM - Post#2012899    

I just bought a 07 Silverado Classic 1500 with the 4.8L. It did not come with an owners manual, so I am wondering what fluid is best for the rear differential? I called Chevy and the guy (who seemed clueless) said AutoTrak II. But the Haynes Repair says SAE 75w90 synthetic gear oil. What is the best to use and how often do I need to change it???

I do not tow, but have a camper in the bed and drive on long trips out of state atleast once a month.
2007 Chevrolet Silverado 1500 Classic 2WD Crew Cab Short Box LS 4.8L


 
LMC Trucks
2plus2 
Member
Posts: 491
2plus2
Loc: Langley,BC
Reg: 02-03-05
12-03-10 09:30 AM - Post#2012962    
    In response to hhouser

any synthetic 75w90 will be fine
I used royal purple in my old 10bolt and now run reg oil in the 14bolt

as for changing it I wouldnt worry about it unless you 4x4 in deep water all the time
there is a magnet that picks up any metal flakes in the oil
69 Canadian Pontiac 2+2
factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35 bfg m/t's 9k winch cutout flares
92 S10,bead locked 38 tsl's,d44,9inch,spools,sm 465/np208/np241,exo cage


 
Bad Bowtie 
Valued Contributor
Posts: 4586
Bad Bowtie
Age: 42
Loc: TX
Reg: 07-04-03
12-03-10 09:48 AM - Post#2012966    
    In response to 2plus2

I think GM says "75W140" Synthetic.

I'd go approx. every 75K and change it- unless you go through high water.


Look here for free:

http://www.extendedgmwarranty.com/owners-manual/

-or-

You can find manuals on www.Ebay.com from time to time cheep.
GMC. We are Professional Grade.

http://www.cardomain.com/id/2004VHO


 
elcamino 
Valued Contributor
Posts: 4998
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
12-03-10 09:53 AM - Post#2012968    
    In response to Bad Bowtie

No, GM is 75W-90. Not even in the 3500 series do they recommend 75W-140.

Fords use that a lot in the SD

IMO, you should change it around 5,000 miles when new and then you can probably go for many miles and never do it again if you use a high quality gear lube. Differentials get extremely hot in the first several hundred miles of use and will generate a lot of wear metals. Probably more in the 1st 5,000 then in the next 100,000.

If you off road a lot in dusty, wet or muddy conditions, you should change it often just to be safe as just a small amount of water or dirt can kill it fast. Hot differentials contacting wet cold water can cause a vacuum effect and suck water in past seals.

Autotrack II is for automatic transfer cases, not for a differential.

PS-Don't assume the GM dealer personnel know anything.

always read your owners manual

download a free manual, click here----> 2007 Owners Manual
free 99-10 manuals here, go down to bottom of page Manuals here
Mike
2009 Cadillac CTS4 AWD Performance Sedan
2012 GMC Sierra AWD Denali 6.2L


 
Bad Bowtie 
Valued Contributor
Posts: 4586
Bad Bowtie
Age: 42
Loc: TX
Reg: 07-04-03
12-03-10 11:18 AM - Post#2013000    
    In response to elcamino

Thanks for correcting me "elcamino".

(That is why I guessed and recommended he look on a manual from that 1st website).
GMC. We are Professional Grade.

http://www.cardomain.com/id/2004VHO


 
Lynn63 
"5th Year" Gold Supporting Member
Posts: 579
Lynn63
Age: 74
Loc: Vicksburg, MI
Reg: 02-07-09
01-01-11 08:02 PM - Post#2025549    
    In response to Bad Bowtie

badbowtie, you were right until GM updated their requirements. My 2007 Classic HD2500 originally called for 75W140 and now GM's recommendation is 75W90. I changed my diff lube early on and now I will change to 75W90 and hopefully gain a little mileage, especially here in the cold country of MI.
Lynn63
63 Impala SS
07 Silverado DMax Classic
99 Venture van


Progress so far...


Edited by Lynn63 on 01-01-11 08:06 PM. Reason for edit: No reason given.

 
elcamino 
Valued Contributor
Posts: 4998
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
01-02-11 09:44 AM - Post#2025749    
    In response to Lynn63

fyi

Friend just changed his front and rear differential and asked me to order what he needed and he used my shop to change it out. Here is a copy he sent me from the 2007 K2500 Crew Cab owner manuals (Duramax).

Btw - He has 125,00 miles on his truck and he spends 6-8 months out of the year sailing ore boats on the Great Lakes. I had to do a double take when I looked at his odometer last week. He does often travel from Duluth to Cleveland to meet a boat.



Here is a CAI system he installed...
Mike
2009 Cadillac CTS4 AWD Performance Sedan
2012 GMC Sierra AWD Denali 6.2L


 
Lynn63 
"5th Year" Gold Supporting Member
Posts: 579
Lynn63
Age: 74
Loc: Vicksburg, MI
Reg: 02-07-09
01-02-11 08:27 PM - Post#2026093    
    In response to elcamino

Mike, Thanks for the message. For more years than I can remember Chek Chart has supplied lubrication use data for many companies such as Auto Value, Auto Zone, AMSOIL, etc.

I just went online and here is a link to many pages of revisions Quick Lubrication Guide (MOTOR info) Just click on any of the links and they show which manuals were wrong and offer the correct info.

I just checked the current AMSOIL Online Product Selection Guide and it, too, specifies 75W90 just like the owners manual does.

I think the old name was something like Gousha Chek Cart. Not sure of the spelling.

Thanks again for the heads up.

Lynn63
63 Impala SS
07 Silverado DMax Classic
99 Venture van


Progress so far...


 
elcamino 
Valued Contributor
Posts: 4998
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
01-03-11 10:30 AM - Post#2026309    
    In response to Lynn63

I recall those names. I just looked at the AMSOIL site which I used for spec's lubes for my friends truck and their info says; Copyright ©2010 MOTOR Information Systems, a division of Hearst Business Media, Inc. All rights reserved.
Mike
2009 Cadillac CTS4 AWD Performance Sedan
2012 GMC Sierra AWD Denali 6.2L


 
Lynn63 
"5th Year" Gold Supporting Member
Posts: 579
Lynn63
Age: 74
Loc: Vicksburg, MI
Reg: 02-07-09
01-03-11 11:12 AM - Post#2026339    
    In response to elcamino

Mike, I've been an Amsoil dealer for over 30 years now and that's the info I've been using for my customers. My error was assuming GM had changed their specs rather than an error in the online data guide, and I apologize for that.
Lynn63
63 Impala SS
07 Silverado DMax Classic
99 Venture van


Progress so far...


 
elcamino 
Valued Contributor
Posts: 4998
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
01-04-11 05:03 AM - Post#2026688    
    In response to Lynn63

ditto (ZO34396)

Nice 63 Impala. My first car was used 63 Impala back in 65ish, I got broadsided and the car was totaled. Funny thing is it was by another 63 Impala 2dr hdtp. LOL today but was po'd at the time, other car ran stop sign in winter and slammed into pass side at rear wheel.

Years ago I had a 64 for about 12 yrs but lost interest in keeping it.


Chevy's I have owned over the years

63 Impala (totaled)
63 Belaire (was dad's car till 70)
66 Biscayne
66 Impala SS396 (new)
70 Chevelle SS5454 (new)
72 El Camino SS350 (new)
73 Chevelle SS350 (new)
77 Monte Carlo Landau
trucks from 79 on

Mike
2009 Cadillac CTS4 AWD Performance Sedan
2012 GMC Sierra AWD Denali 6.2L


 
Stovebolt38 
Forum Newbie
Posts: 22

Age: 65
Loc: Pasco, WA.
Reg: 05-14-10
01-11-11 08:28 PM - Post#2030733    
    In response to elcamino

For what its worth, you can go to GM's Corprate website download an Owner's Manual for free. They didn't have one for the Duramax, but the drive axles are in the owner's Manual anyway.
I put Helm's website here too. I ordered both for my '09.

http://www.gm.com/

http://www.helminc.com/helm/homepage.asp?r=
Pat


 
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