This is our basic differential cover, we see it as the only one worth making. The 14 Bolt axle is found in Chevy 3/4 Ton Suburbans & 3/4 & 1 ton trucks, what they end up in is up to you. The Diff cover is a 1 piece Plate steel cover bent 8 ways, way hard to hurt in .375 (3/8"). The ring is also .375. One of the reasons it is so hard to hurt is that we manufacture it out of A50 Plate Steel, thats 50,000 PSI Tensile strength. After welding the mounting surface is machined absolutely flat for a perfect fit! This is for an fully welded 14 Bolt FF Diff Cover, welded inside and out.