Timmyb Posted July 18, 2019 Share Posted July 18, 2019 (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 44,000lb 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 July 18, 2019 by Timmyb Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/page/2/#findComment-428204 Share on other sites More sharing options...
Bud’s Posted July 18, 2019 Author Share Posted July 18, 2019 @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 Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/page/2/#findComment-428214 Share on other sites More sharing options...
Bud’s Posted July 18, 2019 Author Share Posted July 18, 2019 @Timmyb Any idea what the outer bearing numbers are?between your 38,000 pound and your 44,000 pound spindles? Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/page/2/#findComment-428215 Share on other sites More sharing options...
theakerstwo Posted July 19, 2019 Share Posted July 19, 2019 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. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/page/2/#findComment-428257 Share on other sites More sharing options...
terry Posted July 19, 2019 Share Posted July 19, 2019 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 Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/page/2/#findComment-428261 Share on other sites More sharing options...
Timmyb Posted July 19, 2019 Share Posted July 19, 2019 (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 July 19, 2019 by Timmyb Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/page/2/#findComment-428262 Share on other sites More sharing options...
Bud’s Posted July 19, 2019 Author Share Posted July 19, 2019 @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. Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/page/2/#findComment-428305 Share on other sites More sharing options...
Timmyb Posted July 20, 2019 Share Posted July 20, 2019 That was running what you would call spokes. Quote Link to comment https://www.bigmacktrucks.com/topic/58136-rear-axle-bearings-odd-sizes/page/2/#findComment-428347 Share on other sites More sharing options...
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