it is hard to say really. there is probably more weight in tubing in the tranny tunnel than the rear end. also, keep in mind there is going to be a heavy turbo setup over the front wheels as well. but yeah, normally on a ff, the tranny is in front of the wheels. with this it is behind the firewall. the s14 rear end is surprisingly heavy and i don't have the axles or brakes in it yet. i'm hoping to keep the weight somewhere around 2300lbs with the range you suggest, 55% front, 45% rear. i've got 245 tires for the rear and 205's for the front on order also. once they arrive, i'll be looking for wheels with the right offset.