leversole Posted March 8, 2011 Share Posted March 8, 2011 Looks like an entire rear end swap might be cheaper than other ways to change the ratio...Are the springs for say, and early model (1965) CRDx and a later model the same size? What I mean is would it be a good swap to just unbolt the spring "clamp" and roll the rear ends out, then roll the new ones in? Are all camelback attach springs the same (I mean the bottom, or longest spring that attaches to the rears)? Quote Link to comment https://www.bigmacktrucks.com/topic/18258-crd92-and-crd93-swapping/ Share on other sites More sharing options...
Rob Posted March 8, 2011 Share Posted March 8, 2011 Looks like an entire rear end swap might be cheaper than other ways to change the ratio...Are the springs for say, and early model (1965) CRDx and a later model the same size? What I mean is would it be a good swap to just unbolt the spring "clamp" and roll the rear ends out, then roll the new ones in? Are all camelback attach springs the same (I mean the bottom, or longest spring that attaches to the rears)?It would be easiest to find a donor truck with the same interior frame width and unbolt the trunion where it mounts through the frame. Remove any crossmembers rearward of the trunion and roll the rears out of both trucks. Rebore holes to match the new trunion, and using new fasteners, bolt it in. Then fit the driveline back into the chassis.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/18258-crd92-and-crd93-swapping/#findComment-74166 Share on other sites More sharing options...
fifth wheel Posted March 8, 2011 Share Posted March 8, 2011 Change the drop-ins, if they have bolted torque rods splice them to your tapered ends.FW Quote Link to comment https://www.bigmacktrucks.com/topic/18258-crd92-and-crd93-swapping/#findComment-74173 Share on other sites More sharing options...
leversole Posted March 9, 2011 Author Share Posted March 9, 2011 Change the drop-ins, if they have bolted torque rods splice them to your tapered ends.FWWhat if the axles are different (course, fine), just change the axles? Then axle caps?Do all of the CRD's (92 and 93) have the same basic casting? That is the drop-in, wheels, hubs would interchange?Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/18258-crd92-and-crd93-swapping/#findComment-74193 Share on other sites More sharing options...
fifth wheel Posted March 9, 2011 Share Posted March 9, 2011 All 92/93 carriers are the same,except a few variations in the power dividers and the torque rod mounting. The driving axle splines are the same for 34k, 38k,and 40k axles.FW Quote Link to comment https://www.bigmacktrucks.com/topic/18258-crd92-and-crd93-swapping/#findComment-74197 Share on other sites More sharing options...
leversole Posted March 11, 2011 Author Share Posted March 11, 2011 All 92/93 carriers are the same,except a few variations in the power dividers and the torque rod mounting. The driving axle splines are the same for 34k, 38k,and 40k axles.FWWouldn't it be easy to take off springs and all by unbolting the entire trunnion (if that is what the cross shaft between the springs and the support) and bolting in the new one?Would all Mack camelback rears have the same side to side spring spacing? or would they be different between say, 44K and 38K springs?None of the manuals I have give much detail on removing the rears from the truck...What about the wheel Hubs? If the rears I get have 20" daytons, can I replace with my 22" daytons?I think a 90's CRD 92/93 setup (with the 4.42 ratio I want) with modern brakes for $2500 would be worth the money to me...just swap everything execpt the trunnion mount (mine is cast)ThanksLeslie Quote Link to comment https://www.bigmacktrucks.com/topic/18258-crd92-and-crd93-swapping/#findComment-74300 Share on other sites More sharing options...
leversole Posted March 13, 2011 Author Share Posted March 13, 2011 Wouldn't it be easy to take off springs and all by unbolting the entire trunnion (if that is what the cross shaft between the springs and the support) and bolting in the new one?Would all Mack camelback rears have the same side to side spring spacing? or would they be different between say, 44K and 38K springs?None of the manuals I have give much detail on removing the rears from the truck...What about the wheel Hubs? If the rears I get have 20" daytons, can I replace with my 22" daytons?I think a 90's CRD 92/93 setup (with the 4.42 ratio I want) with modern brakes for $2500 would be worth the money to me...just swap everything execpt the trunnion mount (mine is cast)ThanksLeslieAny more thoughts? Quote Link to comment https://www.bigmacktrucks.com/topic/18258-crd92-and-crd93-swapping/#findComment-74393 Share on other sites More sharing options...
adr Posted May 18, 2011 Share Posted May 18, 2011 not sure if you talking just on the old old stuff or not.... the splines for the yokes are different on the older one then newer(course vs fine) as well as the axle shaft.... a ch trunion stand will not fit in a r model... too wide,,, a 38000 has a different trunion shaft, has rubber bushing and a two piece spring seat,,, a 44000 has a one piece brass bushing seat..unbolting the trunion stand from the frame, removing all necessary xmembers and rolling the entire axle spring trunion out of one truck and put into another would be the easiest, then tearing everything downn,,,,,, do your parts guys a favor and write down the vin for the truck you take it out of..that goes for any modification.... the only info parts guys have is what it left the factory with, unless you tell us.. Quote Link to comment https://www.bigmacktrucks.com/topic/18258-crd92-and-crd93-swapping/#findComment-77994 Share on other sites More sharing options...
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