Jump to content



Photo
- - - - -

Rear Differential Fluid Capacity?


This topic has been archived. This means that you cannot reply to this topic.
13 replies to this topic

#1 Jet-X

Jet-X

    Enthusiast

  • Member
  • 108 posts
  • Location:Milpitas, Ca (NOR*CAL)
  • Gender:Male
  • Drives:2002 Silverado X-Cab 5.3L 2WD

Posted 23 January 2004 - 11:46 AM

I'm ordering some Amsoil gear oil but can't seem to locate a spec. on the capacity. The owners manual is useless. :rolleyes: Anyone have a ball park guess on how many quarts to buy? My truck is an '02, 2WD with the limited slip (posi) rear. Thanks...

#2 Bish

Bish

    Senior Enthusiast

  • Member
  • 1,670 posts
  • Location:Chicagoland

Posted 23 January 2004 - 12:13 PM

Mine is about 2.25 qts so 3 should be plenty. I have the G80 locker. Don't forget, the fill level is aactually below the fill hole. I use an L shaped hex key to measure. If you top it to the fill hole, the seal will eventually start leaking.
2008 Yukon Denali AWD Red Jewel
6.2L, 6L80E EFILive and a BlackBearPerformance tune. GMPP CAI, Hotchkis Front/Rear Sway Bars
2008 Buick Enclave - All GM for us now!

#3 seadoons

seadoons

    Enthusiast

  • Member
  • 860 posts
  • Location:Houston, TX

Posted 23 January 2004 - 02:51 PM

Good advice from above - don't overfill this fluid - follow the guides on this site and use the L-shaped hex key and you'll be just fine.
Posted Image

2002 Chevrolet Silverado Extended Cab Z71 LS 5.3L - Forrest Green

Factory Installed Options: Autotrac, limited slip diff., painted fender flares, trailer towing package

Aftermarket Additions: BFG 285/75/16 All-Terrains, 16x8 Chrome American Racing Python Wheels, Bilstein 5100 Shocks, Westin nerf bars, manik brush guard, KC lights on the guard, spray in bedliner, Delta chest-style tool box, 2 10" Xtant subs in a thunderform box, 20% tint for the front windows.

#4 Jet-X

Jet-X

    Enthusiast

  • Member
  • 108 posts
  • Location:Milpitas, Ca (NOR*CAL)
  • Gender:Male
  • Drives:2002 Silverado X-Cab 5.3L 2WD

Posted 23 January 2004 - 03:47 PM

Cool.. Thanks for the replies. By the way, do the newer differential's have a drain plug or do I have to remove the cover?

#5 seadoons

seadoons

    Enthusiast

  • Member
  • 860 posts
  • Location:Houston, TX

Posted 23 January 2004 - 03:55 PM

I have a 2002 and it has two plugs - one on the bottom to drain and one on the upper passanger side to fill...

Follow this link for a guide...you must scroll down on the page to see the pics.

http://www.gm-trucks...Difffluid.shtml
Posted Image

2002 Chevrolet Silverado Extended Cab Z71 LS 5.3L - Forrest Green

Factory Installed Options: Autotrac, limited slip diff., painted fender flares, trailer towing package

Aftermarket Additions: BFG 285/75/16 All-Terrains, 16x8 Chrome American Racing Python Wheels, Bilstein 5100 Shocks, Westin nerf bars, manik brush guard, KC lights on the guard, spray in bedliner, Delta chest-style tool box, 2 10" Xtant subs in a thunderform box, 20% tint for the front windows.

#6 scottac

scottac

    Enthusiast

  • Newbie
  • 86 posts

Posted 23 January 2004 - 06:38 PM

I really don't see the big deal with overfilling the fluid. you say it will leak out of the fill hole. Well what if you park with your truck facing down a steep hill. and besides, the gear oil is getting sloshed around in there pretty good.

I fill mine all the way up and just wrap the plug with teflon tape. never had any trouble with leaks.

#7 Black02Silverado

Black02Silverado

    Senior Enthusiast

  • Member
  • 3,281 posts
  • Location:Faison North Carolina
  • Gender:Male
  • Drives:2002 Silverado 91 Jetta TD

Posted 23 January 2004 - 06:42 PM

Some have drain plugs and some don't. My 02 has one but a friend of mine bought his truck 6 months later and it has the same options but no drain plug. I can't understand why but there must be a reason. If your lucky yours will have one. Althought I would recommend pulling the cover and cleaning out inside and cleaning off the magnet. Mine had a collection of fuzz on it with only 12k miles on the truck when I switched both front and rear over to the Series 2k oil.
Black 02 Silverado Z71, 5.3L Amsoil Fluids Black Bear Tuned with AutoCal
Black 2013 Camaro 2SS/RS M6
Economizer 91 Jetta Turbo Diesel

AMSOIL Synthetic Lubricants & Filtration Systems, Click Here
Wholesale pricing available!

Posted Image

#8 JayMan

JayMan

    Enthusiast

  • Member
  • 594 posts

Posted 23 January 2004 - 08:00 PM

Some have drain plugs and some don't. My 02 has one but a friend of mine bought his truck 6 months later and it has the same options but no drain plug. I can't understand why but there must be a reason. If your lucky yours will have one. Althought I would recommend pulling the cover and cleaning out inside and cleaning off the magnet. Mine had a collection of fuzz on it with only 12k miles on the truck when I switched both front and rear over to the Series 2k oil.

Good point on the initial service. That is when you'll find a collection of filings on the sheet metal cover magnets. I did mine at 600 miles and again at 1,200 miles. At 1,200, hardly a spec.

I've always filled my axle to the fill hole and never a problem. I wonder if GM is admitting to leaks with their pinion seals or axle seals??

Mine came with "no charge" leaking pinion seal which the local dealer promptly replaced. I've kept mine topped off and never had a leak since.

My owner manual and the Helm shop manual both suggest 2 quarts. That would leave the pinion bearing completely dry and depend on "splash" for lubrication. It will hold about 2.7 quarts.

The first time you fill, with the fluid at the fill plug put the plug back in. A week or so later you'll check and discover you can squeeze in about 20 fl oz more. The rest must settle into little nooks and crannies.
Jerry

2000 GMC Sierra 4WD SLT Extended Cab, Sunset Gold Metallic, Sportside, Z71, 4.10 gears, G80 Gov-Lok, Z82 towing

#9 westex39

westex39

    Enthusiast

  • Newbie
  • 47 posts
  • Location:Lubbock, TX

Posted 24 January 2004 - 09:11 AM

Rear differential oil level for a 1/2 ton, 8.5" ring gear is from
5/8" to 1 5/8" below the fill hole when the oil is cold. You can
find this information in your owners manual.
Personally I fill mine to 1" below the fill hole. Never had a
problem. I to use Amsoil 75W-90.

westex

Edited by westex39, 24 January 2004 - 09:11 AM.


#10 Bish

Bish

    Senior Enthusiast

  • Member
  • 1,670 posts
  • Location:Chicagoland

Posted 24 January 2004 - 12:19 PM

I really don't see the big deal with overfilling the fluid. you say it will leak out of the fill hole. Well what if you park with your truck facing down a steep hill. and besides, the gear oil is getting sloshed around in there pretty good.

I fill mine all the way up and just wrap the plug with teflon tape. never had any trouble with leaks.

It's not that it leaks out the filler hole. It will start leaking at the seal where the driveshaft enters the differential. Not a fun repair especially if you caused it by overfilling.
2008 Yukon Denali AWD Red Jewel
6.2L, 6L80E EFILive and a BlackBearPerformance tune. GMPP CAI, Hotchkis Front/Rear Sway Bars
2008 Buick Enclave - All GM for us now!

#11 scottac

scottac

    Enthusiast

  • Newbie
  • 86 posts

Posted 24 January 2004 - 02:15 PM

that is interesting thanks for the info bish. but wouldn't the fluid still slosh around causing it to leak out.

just a thought. I am sure that the owner's manual and the Helm aren't wrong and you aren't in danger of underlubricatating but I feel that if it is going to leak overfilling the diff won't be the cause.

JMO.

#12 RyanbabZ71

RyanbabZ71

    Senior Enthusiast

  • Senior Moderator
  • 18,722 posts
  • Name:Ryan
  • Location:Avon, Indiana
  • Gender:Male
  • Drives:2010 Chevy Silverado Crewcab Z71 6.2L

Posted 24 January 2004 - 05:13 PM

this is the actual capacities per the helms manual

Axle
Rear 8.6 Ring Gear 2.0 Liters 2.1 Quarts

Ryan

2010 Silverado Crewcab 4wd Z71 6.2L V-8 (L9H) Flex Fuel 6 Speed Transmission Sheer Silver Metallic
2012 Camaro 2SS Convertible 6.2L V-8 (L99) Ashen Gray Metallic
My Garage: http://www.gm-trucks...gallery&user=56
Camaro Mods http://www.camaro5.c...ad.php?t=257256

 

med_gallery_56_1830_72290.jpg


#13 JayMan

JayMan

    Enthusiast

  • Member
  • 594 posts

Posted 24 January 2004 - 06:01 PM

I still for the life of me can't figure out why GM wants the rear axle kept that low on the 1500's. If you carefully measure down, with the fluid at the "recommended" level the pinion bearing is high-n-dry and will have to depend on splash for lubrication.

The 1500HD, 2500LD, 2500HD, and 3500 all recommend the rear axle fluid level to be kept flush with the fill hole. The 1500HD and 2500LD axles are "heavier duty" than the 1500LD, but are still the semi-floating design. The 2500HD and 3500 axles use full-floating wheel support.

My 1500 came from the factory with a leaky pinion seal on the rear axle. I noticed this the very next day when I backed out of my garage. The GM dealer promptly fixed it.

I've always kept my rear axle "topped off" and have never had a leak. Some folks have commented that if you don't keep the fluid low, the excess will be forced out the vent tube.

I don't buy that either. Synthetic gear oils are MUCH more thermally stable than mineral-based gear lubes, so there is much less of this expansion. I'm sure I would have noticed excess fluid after towing +7,200 lbs, nothing.

FYI the vent tube is routed to just under the gas fill. If it did pee out, you'd have gear oil all over your gas cap.
Jerry

2000 GMC Sierra 4WD SLT Extended Cab, Sunset Gold Metallic, Sportside, Z71, 4.10 gears, G80 Gov-Lok, Z82 towing

#14 Nick2000Gmc

Nick2000Gmc

    Enthusiast

  • Member
  • 81 posts

Posted 25 January 2004 - 05:33 PM

The company that made that rear end put the fill line where they think it should be, Gm decided they liked it below that. Welll seeing as how GM has enough trouble keeping my engine from Knocking, I think I will follow the manufactures recommendations ( The real manufacturer ) Anyways older trucks that what ya did filled to the top and let it seep out. My 2000 with the 3.73 No locker takes a little under 3 to fill it. In case anyone is wondering it has held up very good 20k and not a problem. I'm gonna have to take the cover off sometime and see what the insides look like when it gets warm.

As for fluids, I like the GM stuff seems to work fine and I would be more worried about the oil you use than the level it's at. Anyways :withstupid
2000 GMC Sierra ext cab 5.3l 4x4 power everything