DSE Assembled Center Section FN988 - 4.10 Ratio - 31-Spline Eaton Truetrac - 070880-410DS
Get Ford 9-inch housing compatibility with the quieter, more efficient operation of an 8.8-inch gearset with the Detroit Speed FN988 Assembled Center Section. Part number 070880-410DS comes completely assembled with a performance-focused 4.10 gear ratio, 31-spline Eaton Truetrac differential, and 1350 forged steel pinion yoke with U-bolts. Detroit Speed's patent-pending FN988 design allows an 8.8-inch center section to bolt directly into a Ford 9-inch housing, giving performance builders a strong, efficient drivetrain solution without relying on a conventional 9-inch gearset.
The FN988 is built around a high-strength nodular cast iron case and forged alloy steel carrier bearing caps. Detroit Speed equips the assembly with a premium ring and pinion, ARP ring gear bolts secured with safety wire, a solid pinion preload spacer, and internal oil channels that continuously lubricate the pinion bearings. Threaded jack bolt holes in the mounting flange help simplify removal from the axle housing, while integrated mounting holes accommodate bolt-on accessories. The FN988 case is also compatible with 8.8-inch gears, differentials, and spools, providing additional flexibility when configuring or updating your drivetrain.
Specifications
- Part Number: 070880-410DS
- Product Type: Differential Assembly
- Case Series: FN988
- Gear Ratio: 4.10
- 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 uses an 8.8-inch gearset in a Ford 9-inch housing
- 8.8-inch gearset provides quieter and more efficient operation than standard 9-inch components
- 4.10 gear ratio for performance-oriented drivetrain combinations
- 31-spline Eaton Truetrac 8.8-inch differential
- High-strength nodular cast iron case
- Premium ring and pinion with ARP ring gear bolts secured with 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 ease case removal
- Case includes mounting holes for bolt-on accessories
- FN988 case is compatible with 8.8-inch gears, differentials, and spools
Installation Notes
The 070880-410DS FN988 is a universal Ford 9-inch center section and is not application-specific. Detroit Speed specifies that FN988-specific axle shafts are required and that the driveshaft will need to be shortened. Verify your complete rear axle and driveline configuration before ordering.
FAQs
What makes the Detroit Speed FN988 different from a conventional Ford 9-inch center section?
The FN988 bolts into a Ford 9-inch housing but utilizes an 8.8-inch gearset. Detroit Speed designed this combination to provide quieter and more efficient operation than standard 9-inch components while retaining the packaging advantages of the 9-inch housing.
What differential and gear ratio are included with 070880-410DS?
This assembled center section includes a 31-spline Eaton Truetrac differential and a 4.10 gear ratio.
Are special axles required for the FN988 center section?
Yes. Detroit Speed specifies FN988-specific axle shafts for this center section. 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 hard-hitting street car, autocross machine, or dedicated track setup, our experienced team can help you put together the right 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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