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 https://www.bigmacktrucks.com/topic/35794-changing-gears/ 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 https://www.bigmacktrucks.com/topic/35794-changing-gears/#findComment-246388 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 https://www.bigmacktrucks.com/topic/35794-changing-gears/#findComment-246401 Share on other sites More sharing options...
Gmerrill0516 Posted May 31, 2014 Share Posted May 31, 2014 55,000# rears. Quote Link to comment https://www.bigmacktrucks.com/topic/35794-changing-gears/#findComment-247418 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 https://www.bigmacktrucks.com/topic/35794-changing-gears/#findComment-247425 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 https://www.bigmacktrucks.com/topic/35794-changing-gears/#findComment-247530 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 https://www.bigmacktrucks.com/topic/35794-changing-gears/#findComment-250273 Share on other sites More sharing options...
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