flynlow8740 Posted May 21, 2014 Share Posted May 21, 2014 I have a B-42S with a SWD-570 bogie and CRDP-92 and CRD-93 rears. The truck has 8.24 gears. Ring and pinion sets pretty easy to come by for these? I would like to change it to a 6.36 or so. Sent from my iPad using Tapatalk Quote Using Tapatalk Link to comment Share on other sites More sharing options...
Gmerrill0516 Posted May 21, 2014 Share Posted May 21, 2014 I believe those are the optional heavy rears if it is like my 66 B-815sx. The lowest ratio they had in the day was 7.49:1 which mine is. It certainly won't win races but will pull stumps with ease. Mine is rated 58 MPH wiht the 11:00-24's on it if I read the Mack paperwork correctly. I can't answer the question for sure but am interested in the answer myself. I should point out that I have the Quadroplex with a 5th gear hig split ration of .69:1 overdrive. Quote Link to comment Share on other sites More sharing options...
flynlow8740 Posted May 22, 2014 Author Share Posted May 22, 2014 These are rated at 38,000. I would have thought a B-81 would have heavier rears than that. Thanks for the info. Sent from my iPad using Tapatalk Quote Using Tapatalk Link to comment Share on other sites More sharing options...
Gmerrill0516 Posted May 31, 2014 Share Posted May 31, 2014 55,000# rears. Quote Link to comment Share on other sites More sharing options...
Maddog13407 Posted May 31, 2014 Share Posted May 31, 2014 rears can be had for those. they changed the housing/bolt pattern around 1960-61. they ill interchange with the newer ones I believe, you just don't use every bolt hole in the hogs head. Quote Link to comment Share on other sites More sharing options...
flynlow8740 Posted June 1, 2014 Author Share Posted June 1, 2014 My truck is a '62 so that will be the newer style? Sent from my iPad using Tapatalk Quote Using Tapatalk Link to comment Share on other sites More sharing options...
Vladislav Posted June 23, 2014 Share Posted June 23, 2014 Older style had 10 bolts all around, 4 of them were big.Newer style has many bolts of the same size, almost like on a R-model.Although I think CDR-92/93 are always newer ones.R-models have a power divider shorter so if you put them in you should correct the prop shaft.But you can go up to 4.17 - 3.86 that way.It would be easier if you post some pics of your carriers.Ring and pinion sets require set-up in a carrier housing so it's easier to swap whole diffs. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment Share on other sites More sharing options...
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