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58,000lb rear swap


03' Big Red
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i am buying a truck with 58,000lb rears but would like to go down in weight rating in the spring to get a nicer ride. will the 58,000 lb differentials fit into a 46,000 lb housing ? i am looking into swapping in a Haulmaxx cutoff but in the interest of saving money would prefer to keep the differentials and transfer them over.

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the carriers are different numbers 92/93  vs. 112/113.  the easy way out is to sell the 58,000  and buy what you want. IMHO you won't be gaining much in comfort.   i run 58k camel back everyday and don't think they ride any worse than  44k/46k.

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  • 2 weeks later...
On 3/21/2020 at 7:01 PM, 6368 said:

the carriers are different numbers 92/93  vs. 112/113.  the easy way out is to sell the 58,000  and buy what you want. IMHO you won't be gaining much in comfort.   i run 58k camel back everyday and don't think they ride any worse than  44k/46k.

 

On 3/21/2020 at 9:06 AM, 03' Big Red said:

i am buying a truck with 58,000lb rears but would like to go down in weight rating in the spring to get a nicer ride. will the 58,000 lb differentials fit into a 46,000 lb housing ? i am looking into swapping in a Haulmaxx cutoff but in the interest of saving money would prefer to keep the differentials and transfer them over.

CRD125/126,CRD150/151, CRD180/181, CRD92/93 & CRD112/113 will fit into any axle housing all the way from 38,000 to 58,000 lbs GAWR. So yes, you can take the differential from 58,000 lbs axle and put it in a 46,000 lb housing.

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  • 3 weeks later...
On 4/1/2020 at 4:06 PM, kt_Engineer said:

 

CRD125/126,CRD150/151, CRD180/181, CRD92/93 & CRD112/113 will fit into any axle housing all the way from 38,000 to 58,000 lbs GAWR. So yes, you can take the differential from 58,000 lbs axle and put it in a 46,000 lb housing.

Good to know that they will bolt in.  What about compatibility with different side gears and axles/splines?  Please share more info about which ones are the same.

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15 hours ago, 6368 said:

Good to know that they will bolt in.  What about compatibility with different side gears and axles/splines?  Please share more info about which ones are the same.

i have  heard different, i was told they wont transfer over by a certain Mack specialized salvage yard...i am hopeful KT_Engineer is correct. that would surely make things much easier

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On 4/18/2020 at 7:17 PM, 6368 said:

Good to know that they will bolt in.  What about compatibility with different side gears and axles/splines?  Please share more info about which ones are the same.

The spindles on S582 are different that S38R/S40/S442 (which have industry standard R-series spindles). If you have pre--2002 S38 etc axle housings then they will have different spindles too. Currently Mack uses R-series spindles for all housings upto 52,000 lbs GAWR (i.e S522R). You will need to swap out the axle shafts to match the housings (different lengths - couple of inches give/take).

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On 4/19/2020 at 10:38 AM, 03' Big Red said:

i have  heard different, i was told they wont transfer over by a certain Mack specialized salvage yard...i am hopeful KT_Engineer is correct. that would surely make things much easier

Only S652 - CRD95/96 (65,000 LBS GAWR) has unique housing and carrier assembly. The rest of the carriers don't fit on S652 housing and CRD95/96 carrier doesn't fit on other top mount axle housings.

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