Detroit Speed Third Member Assembly 31-Spline With 8.8 Truetrac Gearset Ford 9”

For those serious about their performance build, the Detroit Speed Ford 9” 31-Spline Third Member Assembly with 8.8 Truetrac Gearset delivers. With its patent-pending 31-spline Eaton Truetrac 8.8-inch differential, this assembly provides a quieter and more efficient gearset than standard 9-inch components. Plus, the internal oil channels continuously lubricate the pinion bearings, ensuring superior durability. The high-strength nodular cast iron case, coupled with a premium ring and pinion utilizing ARP ring bolts with safety wire, offers added strength and safety.

Features and Benefits:
– Patent-pending 31-spline Eaton Truetrac 8.8-inch differential
– Quieter and more efficient gearset than standard 9-inch components
– Continuous lubrication of pinion bearings provided by internal oil channels
– High-strength nodular cast iron case
– Premium ring and 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
– Available in the following gear ratios: 3.08, 3.27, 3.55, 3.73, and 4.10

The carrier-bearing caps are forged from alloy steel for even more added durability. The 1350 forged steel pinion yoke with U-bolt kit and jack bolt holes in the mounting flange make for easy case removal from the axle housing, while the case includes mounting holes for bolt-on accessories. With several gear ratios to choose from, you can tailor your assembly to meet your exact needs.

Vehicle Fitment:
– 1965-1973 Mustangs
– 1966-1977 Broncos
– 1948-1979 F-100s

Tech Tip:
– 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.