Strange Engineering only uses the highest quality gears available from U.S. Gear, Motive Gear and Richmond for Ford 9” applications. The 8620 pro street gears provide excellent life for circle track, street and some drag race applications. When investing in a new ring and pinion, it is important to use new bearings, seals, ring gear bolts and other essential installation components. Strange offers a wide selection of installation kits to compliment the line of gears.