Hey Dave,
I believe that there was very little structural difference between the Newell Classics. My 1978 has "sprayed in" foam insulation which would have been "state of the art" in it's day. Be very aware of the integrity of the frame and floor of the bays on early models. They are very strong but corrosion can be a factor. I am updating my Newell as I go. I've found a more modern spade-type fuse block from an RV salvage store. Updated the House battery charger, new fridge and furnace etc. As far as power some folks aren't impressed with the Cummins 555 but I have not had any problems with it and have always been able to find whatever parts I need. It is much easier to work on than the DD V series engines.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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