joemac Posted January 23, 2014 Share Posted January 23, 2014 Something I've wondered about since I was a boy- what does the number following the 'B' signify?For example, B61, B75, etc.If anyone can explain where the numbers come from, I would feel very enlightened.Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Reuhlz Posted January 23, 2014 Share Posted January 23, 2014 Best place to start is the wiki on this site:http://www.bigmacktrucks.com/index.php?/tutorials/category/2-antique-classic-mack-info/Tons of information!To basically answer your question: Lots of variables like rating of the truck and engine options. Odd number is typically diesel, even number typically gas. (fire trucks don't hold that theory well) In general the smaller number, the lighter weight rating.I hope this gives you a start....Drew Quote Link to comment Share on other sites More sharing options...
joemac Posted January 24, 2014 Author Share Posted January 24, 2014 Thanks. That pretty much covers it. Quote Link to comment Share on other sites More sharing options...
Phase 1 Posted January 26, 2014 Share Posted January 26, 2014 The tens series numbers were the gross weight rating according to the John Montville Mack book. B-30 series was in the area of 30,000 pounds, B-40 - 40,000, etc. They do not always follow that, but it was the general intent originally. The next digit was the general model of the truck. Quote Link to comment Share on other sites More sharing options...
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