The Dodge M-Series chassis was heavy duty frame used under various Class A motorhomes from 1968 to 1979. All M-Series chassis used a solid front axle with leaf springs, and Dana 60 or 70 solid rear axles with leaf springs. Frames were used by Winnebago, Champion, and several other RV manufacturers. The line was offered in four ratings, M-300, M-400, M-500, and M-600 depending on the application. The M600 was offered with the Rockwell F-130-NX rear axle, with a 4.88:1 gear ratio.
By 1979, Chrysler Corporation no longer sold incomplete chassis and ended production of the M-Series.
The M-Series was available with three engines during its production: The 318 polysphere Chrysler A engine, the 413 cid, and the 440 cid Chrysler RB engine.
References
Dodge M-Series Chassis Wikipedia(Text) CC BY-SA