pdoughty Posted March 5, 2010 Share Posted March 5, 2010 I have a B42p that is equipped with a 5 speed transmission and two speed rear end.The correct police have cited me many times that Mack did not make two speeds, I agreewith that, but I have seen a web site that shows production numbers and that site saidsome B models we're factory equipped with 2 speeds but not Mack differentials. Mine appearsto be a factory installation, Brass 2 speed instructions on the dash, electric speedometer2 speed switch and all wiring in original harnesses. Anyone know about this or what websiteI might have looked at? I have sent for the build sheets for all seven of my B's but haven'treceived anything yet. Thanx PKISME Quote Link to comment https://www.bigmacktrucks.com/topic/12906-b42p-2-speed-differential/ Share on other sites More sharing options...
Packer Posted March 5, 2010 Share Posted March 5, 2010 I've got a two speed (electric) that has 'Mack' cast in the housing.I was there when it was removed from the 'B' model.So even though I'm not a Guru in the drive train department, I'd be hard pressedto believe that Mack didn't put them in some trucks.Packer Quote Keep a clutchin' Link to comment https://www.bigmacktrucks.com/topic/12906-b42p-2-speed-differential/#findComment-50659 Share on other sites More sharing options...
pdoughty Posted March 5, 2010 Author Share Posted March 5, 2010 I've got a two speed (electric) that has 'Mack' cast in the housing.I was there when it was removed from the 'B' model.So even though I'm not a Guru in the drive train department, I'd be hard pressedto believe that Mack didn't put them in some trucks.Packer Thanx Mine doesn't have the Mack embossed in the housing which is one of the reasonsThat I am confused. (that probably isn't the ONLY reason that I am confused) just trying to get it all worked out.PKISME Quote Link to comment https://www.bigmacktrucks.com/topic/12906-b42p-2-speed-differential/#findComment-50661 Share on other sites More sharing options...
Maddog13407 Posted March 5, 2010 Share Posted March 5, 2010 you could get a 2 speed rear in a B model. most of them were in B20 and B30's and had juice breaks and a Timkin rear end housing. We had a B30 that had a 2 speed rear in a standard Mack housing that had the Mack script also. Have also seen a few B42's with a 2 speed rears. Somtimes i think they just grabbed whatever parts were handy on the assembly line and put them together. Everytime i think i know it all about B models, Mack stumps me.... ~Matt Quote Link to comment https://www.bigmacktrucks.com/topic/12906-b42p-2-speed-differential/#findComment-50662 Share on other sites More sharing options...
Rob Posted March 5, 2010 Share Posted March 5, 2010 One of my Mack service manuals covers the two speed rears. It only covers Mack built differentials and nothing vendored.I would say Mack built one themselves if it's in this book.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/12906-b42p-2-speed-differential/#findComment-50665 Share on other sites More sharing options...
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