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Dana 70, pinion bearing preload?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KRAZIE87K5, Feb 8, 2004.

  1. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Hey all-

    Just got the 70 into the K5 this past weekend... installed new seals, brakes, hardware, even changed out the pinion seal. However, when it was all back together the pinion was a little harder to turn than I would have expected. /forums/images/graemlins/doah.gif Once the axle was in the truck, the shafts were pulled, and we backed off the nut on the pinion to check what was up. We put it back on, and found that if it was tightened up to the point just before where it got "tight" to turn, there seemed to be excessive (around .030-.040). It seemed somewhat loose to me, but more to others working with me.

    A few questions:

    With the bearing preload set (roughly) correctly, how much end play should I expect?

    Is there a crush sleeve in a 70? Or is it all shimmed?

    Is .030-.040 too much end play with the bearing preload set?

    Thanks for any help folks...

    -Dan
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I believe all Dana axles use solid pinion bearing spacers.
     
  3. tarussell

    tarussell 1/2 ton status

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    What was the D70 out of originally ?
    Yes some later model Dana 70's do have a crush sleeve !
    Yes that is to much play .
     
  4. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    It was out of a '86 Chevy Dually...

    -Dan
     
  5. tarussell

    tarussell 1/2 ton status

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    Than it should be an HD 70 and it DOES NOT have a crush sleeve . Tom
     
  6. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    so why the excess end play?
     
  7. tarussell

    tarussell 1/2 ton status

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    Something is not right with the pre-load .....It should not have gotten that tight - was it a running axle assy. before you got it ? You said that you changed the pinion seal - Why ? was it dry and brittle or are your pinion bearings going bad and the seal got wollard out ? A leaking seal is usually a sign of a deeper problem .
    Your bearings could be bad and still remain within the tappered cage.
    If the axle was running before you installed it I would really look hard at the bearings - replace both bearings at the same time with quality ( name brand ) bearings and see what that does .
    Pre-load with new bearings should be something like 20" pounds rotating .
    HTH , Tom
     
  8. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Page 29, Dana 70 manual

    Page 30, Dana 70 manual

    Point being, looks like it should read between 20-40 lbs inch.

    I've ordered a pinion shim kit from a local Spicer dealer... I guess I'll look up a set of new pinion bearings as well. /forums/images/graemlins/doah.gif

    -Dan
     
  9. tarussell

    tarussell 1/2 ton status

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    Yep , that's it . I was just keeping you on the loose side with my reply since I could not remember how tight to go and remain within tollerance .
    When you get your new bearings you are going to be amazed at how big the inner pinion bearings is - that thing is huge with really long tappered rollers in it !
     

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