Assuming we start with a GN that has the regular steel bumper reinforcements and not aluminum ones, all that fiberglass probably took off close to 150 pounds or so. Add to that another 25-30 lbs. for the front sway bar, figure 15-20 lbs. saved per corner (compared to stock GN rims) due to the Weld wheels and a few other misc things, and it starts to add up. In other words, 3700 lbs seems a little heavy unless that's including driver and fuel, or a TH400 is a lot heavier than I thought...? By way of contrast, my car has all its factory body panels but no t-tops, a rollbar, chrome bumpers with T-Type reinforcements, 200-4R, big front mount, A/C and so on, but weighs about 3600 with me in it including fuel. Anyway, 3700 struck me as a fairly big number given all the weight saving measures employed. FWIW, there's a place called Dycorp on Ball Road in Anaheim just past the RR tracks that has a public scale right out front by the street; a lot of truckers use it since it's so close to I-5 so the state checks it fairly frequently for accuracy.