DSE Ford 9-Inch S-Series Center Section - 3.70 Ratio - 31-Spline Eaton TrueTrac - 1350 Yoke - 90-30020
Put together a serious Ford 9-inch rear end with the Detroit Speed 90-30020 S-Series Center Section. Designed as a performance street gear package, this assembled third member combines a 3.70 gear ratio with a 31-spline Eaton TrueTrac differential and 1350 yoke. The 3.70 final-drive ratio gives performance street, restomod and Pro Touring builds a strong gearing option, while the gear-driven TrueTrac helps put power to both rear tires without relying on conventional friction clutch packs.
Detroit Speed builds the 90-30020 around a nodular iron S-Series 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 provide 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 assemblies as part of its quality-control process. This S-Series configuration does not offer an oil-pump option.
Specifications
- Part Number: 90-30020
- 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: 3.70
- 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 performance street gear package
- 3.70 gear ratio for performance-oriented Ford 9-inch rear axle combinations
- 31-spline Eaton TrueTrac provides gear-driven limited-slip operation
- Nodular iron S-Series case provides a strong foundation for the differential assembly
- 1350 yoke with U-bolt kit for compatible driveline applications
- 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 90-30020 as an S-Series Ford 9-inch differential assembly with a 3.70 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. Transmission gearing, tire diameter and intended vehicle use should also be considered when choosing a 3.70 final-drive ratio.
FAQs
What gear ratio and differential does the DSE 90-30020 use?
The Detroit Speed 90-30020 combines a 3.70 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 pinion support and yoke are used on the DSE 90-30020?
Detroit Speed equips the 90-30020 with an aluminum Daytona pinion support and a 1350 yoke. The yoke includes a U-bolt kit for the driveline connection.
Does the DSE 90-30020 have an oil-pump option?
No. Detroit Speed specifically lists the 90-30020 S-Series center section without an oil-pump option.
Get Your Detroit Speed Components from Beefcake Racing
Build your Ford 9-inch rear end with the Detroit Speed 90-30020 S-Series Center Section featuring 3.70 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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