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Rear axle bearings odd sizes????

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Posted (edited)

Just checked my 38 diff for you any. And yep my inner bearing is a 598a. 

Also is a pic of the two different length spindles. 

38,000lb

72579BFC-4C2B-46E3-8EAE-58BB18AB8A28.thumb.jpeg.beb1e0ceb9162bdca11ae274a14b6354.jpeg

44,000lb

1C568F4D-2A22-4F1E-828D-5BCD1D4C0D05.thumb.jpeg.18b4a86e30f18d5a56da7088d16f5d94.jpeg

So my 38 spindle is about 8 inches long, the 44 is 9.25 inches long in case my pics are hard to see. 

Hope that helps you. 

Edited by Timmyb

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@Timmyb

 If you don’t mind, that would be fantastic! 

Mack  is telling me that this truck originally came with 44,000 pound rear ends.

 

The  original rear spring packs consisted of 11 leaf springs. Mack is Telling me the original number for the rear spring packs that came with it is 3QK5333P57

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@Timmyb

Any idea what the outer  bearing numbers are?between your 38,000 pound and your 44,000 pound spindles?

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I remember seeing the two different length spindles and it can be used for different hubs.the long spindles with one hub may use a 3/8 spacer behind the inside brg.

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1 hour ago, theakerstwo said:

I remember seeing the two different length spindles and it can be used for different hubs.the long spindles with one hub may use a 3/8 spacer behind the inside brg.

I have seen that spacer behind the inner bearing before, just did not know the reason for it.    terry:MackLogo:

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Posted (edited)

Outer bearing on the 44 reads timken hm-617049. 

Outer on the 38 reads timken hm-617010.

My truck started life with 34,000lb diffs, but when I bought it there was a 38 at the front and a 44 on the rear. 

 

Edited by Timmyb

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@Timmyb

What style of hub assemblies were you running on those axle housing’s?

 Stud pilot, spoke, hub pilot? 

 You also mentioned on your 38,000 pound unit your inner bearing was a 598A And you’re outer is the hm617049/hm617010 combo.  Any idea the number on the hub assembly that was on that particular axle? 

Thanks,

Rob.

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That was running what you would call spokes. 

 

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