DSE Ford 9-Inch S-Series Center Section - 3.50 Ratio - 31-Spline Eaton TrueTrac - 1350 Yoke - 90-30015
Build a strong, street-ready Ford 9-inch rear end with the Detroit Speed 90-30015 S-Series Center Section. Designed by Detroit Speed as a solid street gear package for high-performance aftermarket builds, this assembled third member combines a versatile 3.50 gear ratio with a 31-spline Eaton TrueTrac and 1350 yoke. The combination gives performance street, restomod and Pro Touring builds a proven limited-slip differential, performance-oriented gearing and a heavy-duty driveline connection in one carefully assembled package.
Detroit Speed builds the 90-30015 around an S-Series nodular iron case and equips it with an aluminum Daytona pinion support, premium ring and pinion, TIMKEN bearings and a DSE solid pinion preload spacer. ARP pinion-support bolts and safety-wired ARP ring-gear bolts add premium fastening hardware, while the 1350 yoke includes a U-bolt kit for the driveline connection. Detroit Speed individually inspects and hand deburrs the components used in its rear gear builds as part of its quality-control process. The S-Series configuration does not offer an oil-pump option.
Specifications
- Part Number: 90-30015
- Manufacturer: Detroit Speed
- Product Type: Differential Assembly / Ford 9-Inch Center Section
- Series: S-Series
- Carrier Style: Ford 9-Inch
- Case Material: Nodular Iron
- Gear Ratio: 3.50
- Axle Shaft Spline Count: 31-Spline
- Differential: Eaton TrueTrac
- Yoke Style: 1350
- Yoke Retention: U-Bolt Kit
- Pinion Support: Aluminum Daytona
- Pinion Support Bolts: ARP
- Ring Gear Bolts: ARP, Safety Wired
- Ring and Pinion: Premium
- Pinion Preload: DSE Solid Spacer
- Bearings: TIMKEN
- Pinion Seal: Premium
- Oil Slinger: DSE
- Oil Pump Option: No
- Emission Code: 4
Features
- S-Series Ford 9-inch center section designed as a solid street gear package for high-performance aftermarket builds
- 3.50 gear ratio offers a versatile final-drive configuration for compatible performance applications
- 31-spline Eaton TrueTrac differential provides gear-driven limited-slip operation
- Nodular iron S-Series case
- 1350 yoke with U-bolt kit
- Aluminum Daytona pinion support
- ARP pinion-support bolts
- Safety-wired ARP ring-gear bolts
- Premium ring and pinion
- DSE solid pinion preload spacer
- TIMKEN bearings
- Premium pinion seal
- DSE oil slinger
- Components are individually inspected and hand deburred by Detroit Speed for quality assurance
- No oil-pump option for this S-Series configuration
Fitment
- Ford 9-Inch Rear Axle Applications
- Applications Using Compatible 31-Spline Axles
- Applications Using a Compatible 1350-Series Driveline Connection
Fitment Notes
Detroit Speed specifies part number 90-30015 as an S-Series Ford 9-inch differential assembly with a 3.50 gear ratio, 31-spline Eaton TrueTrac and 1350 yoke with U-bolt kit. Confirm axle spline count, driveshaft and U-joint compatibility, and all other rear axle requirements for your specific build before ordering. Detroit Speed lists REM isotropic surface finishing as an available addition for increased performance, durability and trouble-free operation.
FAQs
What gear ratio and differential does the DSE 90-30015 use?
The Detroit Speed 90-30015 combines a 3.50 gear ratio with a 31-spline Eaton TrueTrac differential. The TrueTrac uses a gear-driven limited-slip design rather than conventional friction clutch packs.
What yoke is included with the DSE 90-30015?
Detroit Speed equips the 90-30015 with a 1350 yoke and U-bolt kit. Verify that your driveshaft and U-joint configuration is compatible with a 1350-series connection before ordering.
Does the DSE 90-30015 support an oil-pump option?
No. Detroit Speed specifically lists the 90-30015 S-Series center section as having no oil-pump option.
Get Your Detroit Speed Components from Beefcake Racing
Build your Ford 9-inch rear end with the Detroit Speed 90-30015 S-Series Center Section featuring 3.50 gearing, a 31-spline Eaton TrueTrac and 1350 yoke from Beefcake Racing. For help confirming gearing, axle or driveline compatibility for your build, email sales@beefcakeracing.com or call 1-855-827-7223.
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