Rob Posted March 7, 2010 Share Posted March 7, 2010 Through the years I've read where the 34,000 pound tandem Mack rears were of the five spoke design, and the 38,000 pound rears had six spokes. Well, upon cleaning my B67 rears I noticed the stamping into the rear rear housing of SWDL56 denoting the series of suspension under the truck. This, suspension according to my service manual that resides right next to my bible, equates to a 34,000 pound rated suspension. I then march across the shop to look at another B61 series and it to is stamped SWD56, (minus the "L"). These too, according to the good book is also a 34,000# rears. Both of these have six spoke hubs so I'm thinking the earlier analogy of the number of spokes is misdirected to identification. Both of these trucks have the same brake setup installed with aluminum brake shoes and shoe mounting adapters. Even the same Mack part numbers are cast into the aluminum brake shoes. Both suspensions look identical to me so I can't figger our why the "L" designation is not stamped into the second trucks' axle housing. I know stranger things have been solved but I know both suspensions are original to their respective chassis. Does anyone know how wide an R model axle housing is and if it will readily go under a B series truck? I've never actually measured this dimension from axle tube end to axle tube end and do not have an R model apart. One of my B model has a busted housing and it has been poorly welded back up, (I didn't do it) and leaks.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
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