Bulldawg1981 Posted 5 hours ago Share Posted 5 hours ago I just recently purchased a 94 CH613 and it has the Eaton DS402 diffs with 4.33 gearing on Mack air ride. I’d like to swap out to higher gear (lower numerically) to have better rpm’s at highway speeds and I would like to replace the Eaton rears with Mack top loaders (personal preference) if it’s not too much of a hassle. Will the Mack rears bolt right where the eatons currently are or are the mounting brackets totally different to where I’d have to have a complete cut off installed? I can’t seem to find this info anywhere and was hoping someone in here could point me in the right direction! Thank you. Quote Link to comment https://www.bigmacktrucks.com/topic/75208-differential-swap/ Share on other sites More sharing options...
Joey Mack Posted 13 minutes ago Share Posted 13 minutes ago I would think you would need to buy an air ride back half and so the swap. If i remember right the 'Z' springs are different and the hangers and torque arms as well. Do you have an air ride truck to look at and take measurements ? I did a 96 CH-613 many years ago, but it was a Camelback truck. Quote Link to comment https://www.bigmacktrucks.com/topic/75208-differential-swap/#findComment-570146 Share on other sites More sharing options...
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