Detroit Speed FN988 Center Section 3.73 Truetrac 070880-373DS

Detroit Speed Assembled Center Section - FN988 - Ford 8.8-inch Gears in a 9-inch Housing 070880-373DS

Is it possible to have a Ford 9-inch without an annoying amount of gear whine? Of course, but at what cost? How much time and money are you going to spend chasing down the issue when you can now simply bolt an 8.8-inch center section into your 9-inch housing thanks to the engineers at DSE? Detroit Speed now offers five different gear ratios and a complete assembly that will bolt directly into your 9-inch housing.

Complete with forged alloy steel carrier bearing caps, high-strength nodular case, safety wired ARP hardware, 1350 forged steel pinion yoke, and a 31-spline Eaton Truetrac differential, it's built to handle some serious power and deliver it quietly and more efficiently than any 9-inch. The FN988 Case is compatible with all 8.8-inch gears, differentials, and spools. Alternate options are available. Contact us for custom builds or combinations not listed. FN988 specific axles will be necessary and driveshaft will need to be shortened.

• Patent-pending design utilizes an 8.8 gear set, which is quieter and more efficient than standard 9-inch components
• 31-spline Eaton Truetrac 8.8-inch differential
• Available in the following gear ratios: 3.08, 3.27, 3.55, 3.73, and 4.10
• Continuous lubrication of pinion bearings provided by internal oil channels
• High-strength nodular cast iron case
• Premium ring & pinion utilizing ARP ring bolts with safety wire
• Solid Pinion Preload Spacer
• Forged alloy steel carrier bearing caps
• 1350 forged steel pinion yoke with U-bolt kit
• Threaded jack bolt holes in mounting flange ease case removal from axle housing
• Case includes mounting holes for bolt-on accessories
• Designed and engineered at DSE and made in USA

Differential Carrier, 3.73 Ratio, 31 Spline, Iron, Natural, Ford 8.8 Gears, Ford 9 in