Hey Fellers, Im new to the duramax forum as i just bought a project truck. Ive got a 2007 3500hd i bought wrecked. My Major Problem is that this truck came slightly modifed.The mods im having most trouble with are the front torsion bars.Firstly they are much smaller than my dads 2500hd. his bar codes are 965 and 966 vs my 267 and 268.that dosent seem correct a 2500hd having heavier bars than a 3500hd. The torsion bars were also mounted on the wrong sides. (left on the right and right on the left). There is also a set of Firestone air shocks on the front. Can anyone tell me if this is some cheap way of lowering a dmax for pulling by slamin 1500 torsion bars in and making up for the suspension with air over shocks