GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 Last Post byLast Post by
Results 1 to 10 of 12
  1. #1
    Join Date
    Feb 2011
    Ararat, North Carolina, United States

    Post Replacing rear axle oil seal on 03-07classic 2500HD

    This may be old hat for seasoned mechanics, but I searched the forums as well as the internet trying to find out how to replace the oil seals on my rear axles.... All the posts I could find were for the 1500's or LD's with open differentials and talked about removing the pinion, c-clips, etc to get the axles out.

    My 2500HD has the full float 4.10 14 bolt differential with G80.

    The oil seal for these axles are located on the back side of the wheel hub. The axle does have to be removed, but for these units, you do NOT have to open up the differential.

    Here is how I did it... may be some shortcuts, feel free to comment if you know of a better way.

    Total process took me about 4 hours but that's because much of it was trial and error without a good guide. I think I could do it again in around an hour.

    1. Jack side of vehicle seal is to be replaced on and use jack stand to support housing.

    2. Remove tire/wheel from vehicle (this is an 8 bolt pattern on these trucks)

    3. Remove brake caliper assembly and bracket. (I removed the two bolts for the bracket and left the entire assembly together. Sit it on the leaf spring and there is no need to remove the brake line)

    4. Loosen 8 bolts on end of axle from hub. (This is what holds in the axle on these models where on the light duties they have the C clip in the differential)

    5. Remove disk/drum from the studs and carefully place to side. (You could have removed this before loosening the axle bolts, but I found it was easier to use the emergency brake to hold the assembly while breaking the bolts loose... remember to disengage the emergency brake or it will be impossible to remove the disk/drum.)

    6. Place pan, towel, etc below axle end to catch oil in the hub assembly.

    7. Finish removing the 8 axle bolts from the wheel hub.

    8. Slide axle out of housing and carefully place to side.

    9. Remove spring clip from threaded area. (I used a pocket slotted screwdriver and it was able to be easily removed.)

    10. Remove key stock between threaded area and locking nut. (This is what the spring clip holds in)

    11. Remove locking nut. A gentle tap may be required to 'break it loose' but once it's able to be turned, it comes off effortlessly.

    12. Gently pry hub off spindle.

    13. Remove oil seal from back of wheel hub assembly.

    14. Oil or grease new oil seal before attempting to install to avoid tearing or distorting new seal.

    15. Gently tap new oil seal into place using a seal tool or soft faced hammer. Take care to install evenly and do not damage the seal!

    Reverse steps from 11 to 1 to re-assemble your axle assembly.

    Be sure to check your differential oil level once you are done. These axle bearings are 'wet bath' and they get their oil from the differential in lieu of using axle grease.

    If your leak was bad, be sure to clean up the emergency brake shoes and drum area before re-assembling.

    Looking back, I WISH I had taken pictures of this process since I could not find any to assist me while doing my research. Feel free to add any in your comments that may help others out.

    Cost of this repair $19.98 for oil seal, 2 cans of brake cleaner $4.95 each.

    Shop estimate to have this done $199 labor, $50 parts, $30 shop supplies/disposal fee.

    Huge savings and a pretty simple job for a DIY.

    2003 Chevrolet 2500HD 4x4 6.0L 4.10 G80 Base
    Victory Red...
    Tech Tubes
    Duramax rims
    AVS Vent Shades
    Whelen EB6 Strobe Pack with 4 corner strobes
    Whelen 295 'PA' system
    Undercover Swing Box
    Factory Cruise switch added and working
    ALL-on-HI diode method.... More to come

  2. #2


    YEP, that is how i did it as well. Only i paid $12 bucks for oil seal at NAPA !

    1996 Suburban K3500 SLT DUALLY
    1988 Camaro RS 383 stroker LT1
    1992 32' Aero-tek Race Boat, 600 CI BBC

  3. #3


    Good job. I only have a couple things to add since I've recently rebuilt my hubs on my full-float 14-bolt axle.

    First, some people have drums, and they come in 2 different flavors. Early 14-bolt axles (let's just say pre-95ish) and duallys have the drum behind the hub and are attached to the hub by the wheel studs. Later 14-bolt axles came in both disc and drum flavors, with the drums on these in front of the spindle to make replacing brakes easier. For the drum models, there's no caliper to remove and hang off to the side, but you do have to back the shoes off. No big deal.

    Second, the proper way to remove the hub nut is with an 8-pronged hub nut socket. The socket might be listed in stores as for 1-ton Chevy truck axles, GM Corporate 14-bolt axles, or Dana 60 axles, since the Dana 60 hub nuts are the same. I think I paid around $20 for mine, and if you tear into at least 2 hubs, (1 axle) it's worth it. You also need it to correctly reset the bearing preload when you reinstall the nut. I've taken the hubs on and off my 14-bolt axle several times already, and have used it on my uncle's 14-bolt dually axle too.
    Last edited by Crawdaddy; 02-21-2011 at 01:51 PM.

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 265K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

  4. #4


    nice post wish i had this the first time i changed my bearing and seal, ended up poping off the diff cover just to relize i dident need to

  5. #5


    Nice post! I am glad you made the point about preload. I am about to change the seals on mine and would have totally skipped that part. What is the prelaod for a 14 bolt corporate 4.10 with G80?

  6. #6


    I'll have to go home and check the specs, but I'm fairly sure the spindle nut preload is to torque the nut to 50 foot pounds while rotating the hub and then tighten it up until the next groove lines up so you can put the key back in.

    For more than you probably ever wanted to know about the 14-bolt rear axle, check out the 14-bolt bible here:

  7. #7


    I really like your site. Excellent content. Please continue posting such profound content.

  8. #8


    I have the same issue with 04 2500hd rear axle leaking. I tried it myself, following the same instructions, however when I went to put the seal back on I could never get the seal to seat properly. I rented the seal tool at hardware store and still could not get get it all the way one. I put it on as far as it would go and then put the locking nut back on, reassemble and still leaked. I took it to a shop and paid 300, and it still leaked, took it back again to different shop same company and still leaked. Just wondering if anyone else has had this problem with rear axle seal leaking? I would like to try it again with some help on how to get that seal seated properly.

  9. #9
    Jr. Mechanic
    Join Date
    Apr 2009
    North Dakota


    When my Dad had a shop (30 years ago) we would gently take the paint off the new seal before installing.
    2013 Escape Titanium 4WD

  10. #10


    ffcapdilla, i have had the same propblem with both of my 2500's the same seal on both and i have yet to figure out how to get it to stop leaking, have you made any progress on it yet?

Page 1 of 2 12 Last Post byLast Post by

Similar Threads

  1. Replacing rear main seal 98 Suburban 2wd
    By phoebeisis in forum GM Powertrain
    Replies: 7
    Last: 01-05-2013, 04:29 AM
  2. Rear axle seal bad
    By TJbear in forum GM Powertrain
    Replies: 5
    Last: 05-18-2010, 06:20 PM
  3. Replacing 2500HD rear disk brakes
    By cmc474 in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 0
    Last: 04-24-2010, 08:50 AM
  4. 1999 rear axle seal?
    By hdominic in forum General Chevy & GM Tech Questions
    Replies: 7
    Last: 12-23-2009, 06:19 PM
  5. Replacing Vent Glass Seal
    By OLD BLUE in forum Chevy Truck Accessories
    Replies: 7
    Last: 03-27-2009, 10:46 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts