DSE FN988 REM Polished Center Section - 3.08 Ratio / 31-Spline Truetrac - 070880-308DS-R
Get the strength and 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 070880-308DS-R FN988 Assembled Center Section. This patent-pending Detroit Speed design allows an 8.8-inch center section to bolt directly into a traditional 9-inch housing, combining proven performance hardware with a design engineered to reduce the gear noise and efficiency losses associated with conventional 9-inch components. This version comes completely assembled with a 3.08 gear ratio, 31-spline Eaton Truetrac differential, 1350 forged-steel pinion yoke with U-bolts, and a REM-polished gearset.
The REM-polished gears set 070880-308DS-R apart from the standard 3.08-ratio FN988 assembly. REM treatment creates a smooth micro-textured surface on the gearset that enhances oil-retention properties. Commonly used in racing applications where reducing mechanical losses matters, Detroit Speed states that the process reduces heat and friction, increases component life, and promotes quiet, efficient operation. The assembly also features a high-strength nodular cast iron case, forged alloy-steel carrier bearing caps, premium ring and pinion with safety-wired ARP ring bolts, internal oil channels for continuous pinion-bearing lubrication, and a solid pinion preload spacer.
Specifications
- Manufacturer: Detroit Speed
- Part Number: 070880-308DS-R
- Product Type: Differential Assembly
- Case Series: FN988
- Case Material: Nodular Iron
- Carrier Style: Ford 8.8-inch
- Differential: Eaton Truetrac
- Axle Shaft Spline Quantity: 31
- Gear Ratio: 3.08
- Gear Treatment: REM Polished
- REM Polished: Yes
- Yoke Style: 1350
- Pinion Yoke: Forged Steel
- Yoke Hardware: U-Bolt Kit
- Universal 9-Inch Center Section: Yes
- Application Specific: No
- Emissions Code: 4
Features
- Patent-pending FN988 design uses an 8.8-inch gearset in a traditional Ford 9-inch housing
- 3.08 gear ratio
- 31-spline Eaton Truetrac 8.8-inch differential
- REM-polished gearset for reduced heat and friction
- REM treatment creates a smooth micro-textured surface that enhances oil retention
- REM treatment is designed to increase component life and promote quiet, efficient operation
- 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 center-section removal
- Case includes mounting holes for bolt-on accessories
- FN988 case is compatible with 8.8-inch gears, differentials, and spools
Fitment Notes
The Detroit Speed 070880-308DS-R 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 that the driveshaft will need to be shortened. Verify the complete axle and driveline combination before installation.
FAQs
What is the difference between 070880-308DS-R and 070880-308DS?
Both are 3.08-ratio FN988 center sections with a 31-spline Eaton Truetrac and 1350 yoke, but 070880-308DS-R features a REM-polished gearset. Detroit Speed states that REM treatment reduces heat and friction, increases component life, and promotes quieter, more efficient operation.
What does REM polishing do to the FN988 gearset?
REM treatment creates a smooth micro-textured surface that improves the gearset's oil-retention properties. The resulting reduction in heat and friction is intended to improve efficiency, component life, and operating refinement.
Can standard Ford 9-inch axle shafts be used with 070880-308DS-R?
No. 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. An FN988 setup requires the correct combination of center section, axle shafts, housing, and driveline components, and our team can help you put together the right package. Questions about Detroit Speed 070880-308DS-R or your FN988 rear axle setup? Email sales@beefcakeracing.com or call 1-855-827-7223.
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