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That 7k Cad tow weight figure is, IIRC, based on a one year only 3.73 or similar low axle ratio. The problem for the late '80's GM fullsize was the 305 Chev motor more than anything else. The rest of the vehicle was easily up to 5k plus with proper weight distribution / anti-sway hitch equipment. But with a V8-350 or something with long life and decent torque curve. (I drove a '77 Impala wagon past 240k on the original motor, rebuilt the TH-350 once).
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