DSE FN988 Assembled Center Section - 3.55 Ratio / 31-Spline Truetrac - 070880-355DS
Get the proven packaging advantages of a traditional Ford 9-inch housing with the quieter, more efficient operation of an 8.8-inch gearset with the Detroit Speed 070880-355DS FN988 Assembled Center Section. Detroit Speed's patent-pending FN988 design allows an 8.8-inch center section to bolt directly into a traditional 9-inch housing, creating a performance-focused alternative to conventional 9-inch components. This version comes completely assembled with a 3.55 gear ratio, 31-spline Eaton Truetrac differential, and 1350 forged-steel pinion yoke with U-bolts.
Built to handle serious power, the 070880-355DS combines a high-strength nodular cast iron case with forged alloy-steel carrier bearing caps, a premium ring and pinion secured with safety-wired ARP ring bolts, 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 help make center-section removal easier. The case also includes mounting holes for bolt-on accessories. Designed and engineered by Detroit Speed and made in the USA, the FN988 gives performance builders compatibility with 8.8-inch gears, differentials, and spools while retaining the traditional 9-inch housing format.
Specifications
- Manufacturer: Detroit Speed
- Part Number: 070880-355DS
- Product Type: Differential Assembly
- Case Series: FN988
- Carrier Style: Ford 8.8-inch
- Case Material: Nodular Iron
- Differential: Eaton Truetrac
- Axle Shaft Spline Quantity: 31
- Gear Ratio: 3.55
- Yoke Style: 1350
- Pinion Yoke: Forged Steel
- Yoke Hardware: U-Bolt Kit
- REM Polished: No
- Universal 9-Inch Center Section: Yes
- Application Specific: No
- Emissions Code: 4
- Manufacturing: Designed and engineered by Detroit Speed and made in USA
Features
- Patent-pending FN988 design utilizes an 8.8-inch gearset in a traditional Ford 9-inch housing
- Designed for quieter and more efficient operation than standard 9-inch components
- 3.55 gear ratio
- 31-spline Eaton Truetrac 8.8-inch differential
- High-strength nodular cast iron case
- Premium ring and pinion with safety-wired ARP ring bolts
- 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 removal from the axle housing
- 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
- Made in USA
Fitment Notes
The Detroit Speed 070880-355DS is a universal FN988 center section and is not assigned to a specific year, make, or model. It is designed to bolt into a traditional Ford 9-inch housing while utilizing Ford 8.8-inch differential components. Detroit Speed specifies that FN988-specific axle shafts are required and the driveshaft will need to be shortened. Verify the complete rear axle and driveline combination before installation.
FAQs
What gear ratio and differential are included with Detroit Speed 070880-355DS?
Detroit Speed 070880-355DS comes assembled with a 3.55 gear ratio and 31-spline Eaton Truetrac 8.8-inch differential. It also includes a 1350 forged-steel pinion yoke with U-bolts.
What makes the Detroit Speed FN988 different from a traditional Ford 9-inch center section?
The FN988 is designed to bolt into a traditional Ford 9-inch housing while utilizing an 8.8-inch gearset. Detroit Speed engineered this combination for quieter and more efficient operation than standard 9-inch components.
Does Detroit Speed 070880-355DS require FN988-specific axle shafts?
Yes. Detroit Speed specifies that FN988-specific axle shafts are required. The driveshaft will also need to be shortened for the FN988 installation.
Why Buy Detroit Speed from Beefcake Racing?
Beefcake Racing is your source for Detroit Speed rear axle, suspension, chassis, and drivetrain components for serious street, pro-touring, autocross, and track builds. Building an FN988 rear end requires matching the center section with the correct axle shafts, housing, and driveline components, and our team can help you put together the right combination. Questions about Detroit Speed 070880-355DS or your FN988 rear axle setup? Email sales@beefcakeracing.com or call 1-855-827-7223.
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