This is a great thread. I have just about everything to make 3950, but I do have one question: I have both the AMT Kenworth W900 kits (one with the spring suspension & one with the torsion bar). Does anyone know what type of suspension 3950 might have had? I would have to guess that for a fleet truck it would have the lightest, cheapest suspension that they could get. The spring suspension in the AMT Kenworth W900 kit s a 38000#, I believe.