yes,its true.The width is the same on the 100-200 axles.If you find a d200 crew cab axle ,they are rated at 3800lbs(same as d300,but different spring width),as opposed to the standard 2800lb d200 axle.
I would be concerned in the brake department. Steering arms may be a problem as well,unless you find a very long pittman arm for your 93.
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Dodge Sweptline Truck General Discussion