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Looking thru the trucks for sale papers I see Superliner  trucks advertised as RW 712, 713,  721 ,722, 733, 753, 755, 766, 767, 786, 795, & 797. I guess the 7 is the weight class. Does anyone have a short and easy explanation on the other numbers. Thanks.

Edited by eddeere
corection
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Mack used to list their chassis by specific model #'s. For example:

RWS786LST was a SuperLiner, tandem axle, ENDT676 (285hp) Maxidyne engine & tractor configuration.  The 'RW' at the beginning was when Mack started building the SuperLiner @ the Hayward California assembly line to replace the RL/RS 700 western models. So if you went back to the 70's before SuperLiner production started, the same truck would've been RS786LST or RL786LST if it had aluminum frame rails.  Once the RS/RL 700 models were discontinued, they used the RW for the SuperLiner. The last 2 numerical digits in the model # designated the engine. Some examples:

RWS753LST  and RWS754LST were SuperLiner chassis with a 3406 engine

RWS788LST were SuperLiner chassis with Mack 350 engines

RWS767LST were SuperLiner chassis with Cummins engines

And for an Allentown built 'R' model, something like an R795ST would be an R700 tandem axle chassis, tractor configuration with the ENDT-865 Maxidyne V-8 engine.

Later year productions, Mack changed over to simply RW712 (single axle chassis), RW713 (tandem axle chassis). The specific vehicle specs were included in the VIN. The SuperLiner also had a lighter version (smaller frame rails, limited axle sizes, etc.) & was the RW613 model usually found in tractor applications. The RW713, having heavier frame rails & more options for heavier drive train components, were heavy-haul tractors, dump trucks, etc. 

Hope you're not totally confused by now but if you need any other info, don't hesitate!

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