Good Sam Club Open Roads Forum: Search
I think the only thing that flexed on the rear axle was the old nylon 10 ply tires (8 body plies plus two over the tread= 10 ply rated). Anyone ever used nylon tires knows all about tire bounce till they warm up and round out. In '61 a 250 would of been a brand new engine, if it was on the market. ('63 IIRC) '51 would of been 235.