Just adding that it has 1 1/4x1" FK hiems everywhere except lower axle mounts. Those have bushings. The links are all 2x.375 dom as all. It had over 1300.00 in rod ends and tube inserts when i built it. The doubler works great with the th400 and the 4.56's. Plenty of wheel spin when needed and low enough not to have to touch the throttle in the technical stuff when in low low 1st gear.