Ford 9" Axle Housing

Ford 9" Axle Housing

Fabricated 9" housing, 72" long with 3.5" × 3/8" DOM tubes and reinforced center

This USA-built housing uses a 3/8" face plate that's drilled and machined flat after welding for precise third-member fit. The shell is 1/4" steel with 12 bends and added 3/16" armor in high-impact areas, plus 1/4" internal gusseting for rigidity. It accepts Ford 9" third members and allows 9" or 10" ring gear setups for high strength builds.

Axle tubes are raw 3.5" OD × 0.375" wall DOM (2.75" ID) keyed into the face plate and fully gusseted—cut to your width during setup. A weld-in 3/4" NPT fill/drain bung is included; installation requires cutting/welding, and the breather vent requires drilling and tapping (5/16"-18). Center section armor, studs, inner seal surface, and seal set screws are included to simplify final assembly.

NOTE: This is a build-to-order product. Please allow a 4-6 week lead time for production.

Key Features

• Part Number: PN1668
• Overall housing length: 72"
• 3/8" face plate, machined after welding
• 1/4" shell with 12 bends + 3/16" armor
• 1/4" internal gusseting ties center together
• Accepts 9" or 10" ring gear third members
• 3.5" OD × 3/8" wall DOM tubes (2.75" ID)

Specifications

• Face plate: 3/8" steel, machined post-weld
• Main shell: 1/4" steel with additional 3/16" armor
• Studs: 3/8"-24 TPI
• Fill plug (standard): 3/4" NPT with weld-in bung
• Breather vent: drill/tap 5/16"-18; brass barb included

Kit Includes

• Ford 9" bare tube housing
• Center section armor installed
• Center section studs
• Fill plug and weld-in bung (cutting/welding required) - choose standard 3/4" NPT or oversized 1.5"- 6 UNC inspection plug
• Inner seal surface and seal set screws
• Brass thread-in breather barb fitting (drilling/tapping required)
• Optional truss reinforcement - available in top, back, or top + back configurations

Note

Housing ships long at 72" and requires cutting/fixturing to your width; mock up axle ends, brackets, and pinion angle before welding. Install the 3/4" NPT bung by cutting and welding, and drill/tap the breather to 5/16"-18 as needed; verify third-member fit on the machined face before final assembly. Use proper fixturing to keep tubes straight, then complete all welds and recheck runout and stud torque prior to service.