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  1. #1

    Default 2500hd rear wheel bearing seal keeps going bad

    Ok I have a 2002 2500hd 4x4 with the 6.0, It has a 6in lift with 35in tires. I changed the passenger side rear wheel bearing seal three times in the past 6 months. I replaced both inner and outer bearings each time they where bad. After a couple weeks of driving it starts to leak rear end fluid, it is a full floating axel. Once it starts to leak i keep the rear end full of fluid to prevent the bearings from going. I installed everything correctly each time and made sure that it is fully seated onto the spindel. I have checked the area where the seal mates with the spindel and there is no sign of roughness or burs. I eye balled the axel and it seems to be straight. I have run out of ideas, does any one have any ideas or have ever heard of a problem like this?
    thanks

  2. #2
    Jr. Mechanic
    Join Date
    Apr 2009
    Location
    North Dakota
    Posts
    130

    Default

    Have you made sure your differential vent tube isn't plugged?

  3. #3

    Default

    I'm gonna guess you off-road this truck, if the vent tube isnt plugged is it possible you bent an axle shaft or axle tube?

  4. #4

    Default

    yeah that was another thing that i checked was the vent tube, i could blow thru it so i figured it was good. I have never really done any serious off roading with the truck, i just take it thru a little mud once and a while

  5. #5
    Legend

    Join Date
    Sep 2010
    Location
    everett, massachusetts
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    1,318

    Default

    Quote Originally Posted by o3gerber View Post
    Ok I have a 2002 2500hd 4x4 with the 6.0, It has a 6in lift with 35in tires. I changed the passenger side rear wheel bearing seal three times in the past 6 months. I replaced both inner and outer bearings each time they where bad. After a couple weeks of driving it starts to leak rear end fluid, it is a full floating axel. Once it starts to leak i keep the rear end full of fluid to prevent the bearings from going. I installed everything correctly each time and made sure that it is fully seated onto the spindel. I have checked the area where the seal mates with the spindel and there is no sign of roughness or burs. I eye balled the axel and it seems to be straight. I have run out of ideas, does any one have any ideas or have ever heard of a problem like this?
    thanks
    I did a while back. bent axle.

  6. #6

    Default

    could you tell it was bent? im sick of dealing with it so im gonna get a new axel and hub from the pick a parts and see what happens

  7. #7
    Legend

    Join Date
    Sep 2010
    Location
    everett, massachusetts
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    1,318

    Default

    when the axle was pulled out the bearing area on the axle looked uneven where the wear marks where , then the axle was checked to see if it was bent and right at the bearing area this is were it was damaged. the axle was leaking on the brakes. after that I never had any leaks. I only had a slight vibration prior to this axle being bent. I was hit slightly in an accident. I guess it hit just right , to throw the axle off. the rim was not damaged or tire. so these axles are soft.

  8. #8

    Default

    How are you setting the bearing pre-load?
    When you hear hoofbeats, look for horses not zebras.

  9. #9
    Legend

    Join Date
    Sep 2010
    Location
    everett, massachusetts
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    1,318

    Default

    bearing preload is the carrier pinion bearing . that should not change unless the diff was rebuilt. I leave that to those who do these diff rebuilds often.

    axle seal/bearing is simple r/r.

  10. #10

    Default

    Pinion bearing preload is pinion bearing preload. Wheel bearing preload is different. Same idea, different bearings. The wheel bearings on a full floater are two tapered roller bearings, like pinion bearings and older style front wheel bearings. They need to be preloaded according to the specific procedure. If his bearings are not tight enough, that could cause the hub to wobble and wear the seal.

    BTW, pinion and carrier are two different things.
    When you hear hoofbeats, look for horses not zebras.

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