03' Big Red Posted March 21, 2020 Share Posted March 21, 2020 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. Quote Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/ Share on other sites More sharing options...
6368 Posted March 21, 2020 Share Posted March 21, 2020 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. Quote Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/#findComment-446284 Share on other sites More sharing options...
blackdog2 Posted March 21, 2020 Share Posted March 21, 2020 80 ;000 TO 58'00 5-WIDE 44'000-46'000 4-INNCH WIDE SPRING i WILL BE LOOKING TO GO FROM 80-K TO 58-K IN THE FUTURE ON ONE OF MINE ... Quote Ed Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/#findComment-446293 Share on other sites More sharing options...
03' Big Red Posted March 22, 2020 Author Share Posted March 22, 2020 I guess I’ll give it a good drive and see how it rides sounds like the best bet is to swap out the whole thing, and yes it has the 5” wide springs versus 4” for the 44 & 46 Quote Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/#findComment-446295 Share on other sites More sharing options...
kt_Engineer Posted April 1, 2020 Share Posted April 1, 2020 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. Quote Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/#findComment-447463 Share on other sites More sharing options...
6368 Posted April 18, 2020 Share Posted April 18, 2020 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. Quote Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/#findComment-449174 Share on other sites More sharing options...
03' Big Red Posted April 19, 2020 Author Share Posted April 19, 2020 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 Quote Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/#findComment-449213 Share on other sites More sharing options...
MACKS Posted April 24, 2020 Share Posted April 24, 2020 Ten wheeler or tri axle, if ten wheel I would leave the 58.. Quote Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/#findComment-449608 Share on other sites More sharing options...
kt_Engineer Posted April 25, 2020 Share Posted April 25, 2020 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). Quote Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/#findComment-449654 Share on other sites More sharing options...
kt_Engineer Posted April 25, 2020 Share Posted April 25, 2020 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. Quote Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/#findComment-449655 Share on other sites More sharing options...
03' Big Red Posted September 12, 2020 Author Share Posted September 12, 2020 UPDATE... the 58,000 lb rides almost as nice as the 44000 lb in my 03 RD but much nicer with a load and running of road ! who woulda thought !! Quote Link to comment https://www.bigmacktrucks.com/topic/61595-58000lb-rear-swap/#findComment-460681 Share on other sites More sharing options...
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