Need help w/ front diff, 99 Tahoe

Discussion in 'GM Powertrain' started by Milo'sTahoe, Jul 12, 2009.

  1. Milo'sTahoe

    Milo'sTahoe New Member

    Does anyone know where I can get a diagram and instructions on how to tear down and rebuild the front diff on my 99 Tahoe? I know a factory manuel would have this, I was more looking to find someone who already had this info. Thanks for your help. Myles
  2. cao88c

    cao88c Rockstar

    Don't take this the wrong way, but if you're asking this question, take it to a shop. Rebuilding a differential is not an easy job, and the average "shade tree mechanic" usually does not possess the skills/tools needed to do the job correctly.

    For what a shop may charge $3-400, you'll spend that in tools alone.

    Why is it that you need to rebuild the front diff? I did work on axles most of my adult life, so I can probably help you out.
  3. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    ......Rebuilding a [COLOR=blue ! important][COLOR=blue ! important]differential[/COLOR][/COLOR][​IMG]
    is not an easy job, and the average "shade tree mechanic" usually does not possess the skills/tools needed to do the job correctly.

    X2 on that statement!

    Usually what happens is someone will disassemble the differential and not mark anything. Give up and then bring it into a shop to have it rebuilt. The end result is it costs more money than if you had just brought the job in and let the shop take it apart.
    The catch when trying to rebuild a diff is the book tells you to use lots of special factory tools that you don't have. Guys that build diffs know how to get around using these tools but these procedures are not written in any books.
  4. Milo'sTahoe

    Milo'sTahoe New Member

    Don't worry I am not taking it the wrong way, I get that rebuilding a diff is not easy. Having rebuilt and regeared a couple Dana 44s and a 10 Bolt in the past by no means makes me an expert either. I have most of the tools needed, just not the diagrams and the specific tear down instructions.

    Why am i rebuilding?? My left (short) output shaft on my front diff is noticeably loose (up and down movement) and leaking fluid. I also have either a bearing or gear noise coming from the front IFS diff which I am sure is associated with this. I don't think it is gear noise cause it does not change when you go from the driving side of the gear to the coasting side of the gear, to me it sounds more like a bearing noise, but I won't know until I open it up. I already checked my rear diff and it is in good shape, bearings, gears and axle shafts and all.

    I have not rebuilt an IFS unit before and would like to learn. I actually have another Tahoe which I may have to do similar work to in 3-5 years as it is a higher mileage truck too and starting to show some wear.

    Both of my Tahoes have had good maintenance from me, but they are both used and the one I need to tear into had 135K on it before I bought it. I hope this helps answer your questions. Thanks, Myles
  5. Milo'sTahoe

    Milo'sTahoe New Member

    Jimmie I hope you get this message, I do not have enough posts to send a PM to you with my info, so here it Thanks, Myles
  6. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    OK, it's on the way. I hope you stick around now and participate.
  7. liftertick

    liftertick New Member

    Hi all, I know this thread is kind of old but I was searching google for some information on rebuilding a front diff and happened to find tihs thread. My 2000 Silverado 1500 has the exact same problem that Milo just started making noise so I crawled underneath it to investigate. Fluid is leaking from around both output shafts and there is noticeable "wiggle" in the left output shaft.
    I see that the common opinion is that this type of repair/rebuild should be left to the professionals, but I'd really like to try this myself. I think I have the tools necessary to do this (torque wrenches, dial indicators, etc) but, like Milo, I could use some help in the form of diagrams, torque specs, preload specs, etc. Any help would really be appreciated. Thanks!
  8. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    I can give you all the specs if you'd like. Send me a PM and I'll get it to you.
  9. liftertick

    liftertick New Member

    Thanks Jim. PM sent.
  10. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    It's on the way.

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