DSE Assembled Center Section FN988 - 3.73 Ratio - 31-Spline Eaton Truetrac - 070880-373DS
Bring together the proven packaging of a Ford 9-inch housing and the quieter, more efficient operation of an 8.8-inch gearset with the Detroit Speed FN988 Assembled Center Section. Part number 070880-373DS comes completely assembled with a 3.73 gear ratio, 31-spline Eaton Truetrac differential, and 1350 forged steel pinion yoke with U-bolts. The patent-pending FN988 design bolts directly into a Ford 9-inch housing while utilizing an 8.8-inch gearset, creating a serious drivetrain solution for performance builds where strength, efficiency, and reduced gear noise all matter.
Detroit Speed builds the FN988 around a high-strength nodular cast iron case with forged alloy steel carrier bearing caps, a premium ring and pinion, ARP ring gear bolts secured with safety wire, and a solid pinion preload spacer. Internal oil channels provide continuous lubrication to the pinion bearings, while threaded jack bolt holes in the mounting flange make removing the case from the axle housing easier. The FN988 case also accepts 8.8-inch gears, differentials, and spools, giving builders additional flexibility for future drivetrain changes.
Specifications
- Part Number: 070880-373DS
- Product Type: Differential Assembly
- Case Series: FN988
- Gear Ratio: 3.73
- Differential: 31-Spline Eaton Truetrac
- Axle Shaft Spline Quantity: 31
- Carrier Style: Ford 8.8-inch
- Case Material: Nodular Iron
- Yoke Style: 1350
- REM Polished: No
- Universal 9-inch Center Section: Yes
- Application Specific: No
Features
- Patent-pending FN988 design combines an 8.8-inch gearset with Ford 9-inch housing compatibility
- 8.8-inch gearset is designed for quieter and more efficient operation than standard 9-inch components
- 3.73 gear ratio
- 31-spline Eaton Truetrac 8.8-inch differential
- High-strength nodular cast iron case
- Premium ring and pinion with ARP ring gear bolts secured by safety wire
- Internal oil channels provide continuous lubrication to the pinion bearings
- Solid pinion preload spacer
- Forged alloy steel carrier bearing caps
- 1350 forged steel pinion yoke with U-bolt kit
- Threaded jack bolt holes in the mounting flange help simplify case removal
- Case includes mounting holes for bolt-on accessories
- FN988 case is compatible with 8.8-inch gears, differentials, and spools
- Designed and engineered by Detroit Speed and made in the USA
Installation Notes
This FN988 center section is a universal Ford 9-inch center section and is not application-specific. FN988-specific axle shafts are required, and the driveshaft will need to be shortened. Confirm your complete rear axle and driveline configuration before ordering.
FAQs
What makes the Detroit Speed FN988 different from a traditional Ford 9-inch center section?
The FN988 is designed to bolt into a Ford 9-inch housing while using an 8.8-inch gearset. This configuration is engineered to provide quieter and more efficient operation than standard 9-inch components while retaining Ford 9-inch housing compatibility.
Does 070880-373DS include a limited-slip differential?
Yes. This assembly includes a 31-spline Eaton Truetrac differential along with the 3.73 ratio gearset.
Are special axles required with the FN988?
Yes. Detroit Speed specifies that FN988-specific axle shafts are required. The driveshaft will also need to be shortened for installation.
Why Buy from Beefcake Racing?
Beefcake Racing is your source for serious performance drivetrain, suspension, and chassis components. Whether you are building a street car, autocross machine, or dedicated track setup, our experienced team can help you select the right components for your combination. Have questions about the Detroit Speed FN988 or your rear axle setup? Email sales@beefcakeracing.com or call 1-855-827-7223 for assistance.
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