Keffer inc Posted September 24, 2015 Share Posted September 24, 2015 I have a 1999 Mack CH613 with a set of Spicer axles. The forward axle in-put yoke is wobbling, Its been to a shop for repairs (Replaced yoke, tightened the nut) These repairs improved the vibration. So now I had Tidewater Mack gave me a quote on a new (or rebuilt) differential, with labor, $4,200. They also said it was no longer in production, and would be hard to find. Parts will obviously become hard to find soon.SO, I want to replace both front and rear axles with another "make" of axles. I have 3:54 ratios now, I think I want to go with 3:73 or possibly 4:11s. My truck can do 70 MPH on flats but does about 25-30 MPH going over mountains like Afton VA and Sandstone WV. I either want Mack, Eaton, or Rockwells. I'm leaning towards Rockwells. So can any axle cut-offs work? Like from a Freightliner, Volvo, International? Can the yoke be swapped to fit the drive shaft Spicer SPL-250 U-Joints or just take my drive shaft to a shop and swap (weld a new yoke) out a yoke? Do I only need to worry about the Track Bars line up or is there more to watch out for? Quote Link to comment https://www.bigmacktrucks.com/topic/41926-looking-for-a-new-set-of-rear-ends/ Share on other sites More sharing options...
alex g Posted September 24, 2015 Share Posted September 24, 2015 Where are you located I have a vision I'm going to sell whole or part out soon I'll check to see what rears are in itSent from my SM-G386W using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/41926-looking-for-a-new-set-of-rear-ends/#findComment-305005 Share on other sites More sharing options...
kt_Engineer Posted September 24, 2015 Share Posted September 24, 2015 (edited) The easiest thing for you to do is buy a brand new differential carrier from Dana (inherited the Eaton/Spicer axle when Roadranger partnership was dissolved). You should look at buying a DS404/405 or DST40 or DST41. All three axles have 3.70 & 4.11 ratio available. The question will be if the differentials fit in the axle housing you have. I think they might but I am not absolutely sure about it. Alternately you can buy Meritor 14x or 160 series axles. 14x has 3.70 & 4.11 ratios available.160 series has 3.73 & 4.10 ratio. You should be able to get used versions cheaper but swapping out the whole axle might not be easy. Also you will need to make sure the suspension brackets can properly bolt on with new axle housings. If they are welded brackets, the build will be much harder.Mack axles with CRD150/151 carrier has 3.79 & 4.19 ratio if you are interested in the swap. The have better pinion angles and you should not see any vibration issues. Edited September 24, 2015 by kt_Engineer 1 Quote Link to comment https://www.bigmacktrucks.com/topic/41926-looking-for-a-new-set-of-rear-ends/#findComment-305034 Share on other sites More sharing options...
Keffer inc Posted September 24, 2015 Author Share Posted September 24, 2015 Where are you located I have a vision I'm going to sell whole or part out soon I'll check to see what rears are in itSent from my SM-G386W using TapatalkI live close to Norfolk, VA. I'm in Moyock, NC, just under the VA line. Quote Link to comment https://www.bigmacktrucks.com/topic/41926-looking-for-a-new-set-of-rear-ends/#findComment-305042 Share on other sites More sharing options...
alex g Posted September 24, 2015 Share Posted September 24, 2015 I have a set of 4:11 Eatons on air ride still in the truck I'll sell if your interested I'm in Ontario Canada Sent from my SM-G386W using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/41926-looking-for-a-new-set-of-rear-ends/#findComment-305068 Share on other sites More sharing options...
Keffer inc Posted September 27, 2015 Author Share Posted September 27, 2015 According to the RoadRanger Ratio Calculator, 4:11 gears running at 1500 RPM will only be 56.6 MPH while the 3:73 gears will be at 62 MPH. Think I want to either stay with 3:55 or 3:73. Quote Link to comment https://www.bigmacktrucks.com/topic/41926-looking-for-a-new-set-of-rear-ends/#findComment-305339 Share on other sites More sharing options...
Keffer inc Posted September 27, 2015 Author Share Posted September 27, 2015 Mack and Volvo rear suspensions are the same other than there front hangers right? Quote Link to comment https://www.bigmacktrucks.com/topic/41926-looking-for-a-new-set-of-rear-ends/#findComment-305340 Share on other sites More sharing options...
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