9" Ford diff housings are very popular in drag racing because of their weightas well as the strength they provide. The only disadvantageto these standard housings is the tendency to flex and bow under hard acceleration. This force tends to flex the rear housing out of shape. To combat this flex, Aeroflow Performance have designed this9" Ford diff housing brace to suit the factory housing or our won coemption diff housing. This two-piece brace welds directly to the rear housing, triangulating the main housing with the axletubes to eliminate any flex. These are made from 1/8" thick mild steel and will require welding to your diff housing.