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Detroit Speed FN988 Assembled Center Sections 070880-355DS Third Member Complete Assembly, Speed, Assembly, 8.8 in. Gears, 31 Spline, Truetrac, 3.55 Ratio, 1350 Yoke, for Ford 9 in Housing, Each

SKU: DSR070880-355DS

Third Member Complete Assembly

Detroit Speed FN988 Assembled Center Sections 070880-355DS Third Member Complete Assembly, Speed, Assembly, 8.8 in. Gears, 31 Spline, Truetrac, 3.55 Ratio, 1350 Yoke, for Ford 9 in Housing, Each

SKU: DSR070880-355DS

Third Member Complete Assembly
A$6,829.48
Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.
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Description

Is it possible to have a Ford 9-inch axle without an annoying amount of gear whine? Of course, but at what cost? How much time and money are you going to spend chasing down the issue when you can now simply bolt an 8.8-inch center section into your 9-inch housing thanks to the engineers at DSE? Detroit Speed now offers five different gear ratios and a complete assembly that will bolt directly into your 9-inch housing. Complete with forged alloy steel carrier bearing caps, high-strength nodular case, safety wired ARP hardware, 1350 forged steel pinion yoke, and a 31-spline Eaton Truetrac differential, the center sections are built to handle some serious power—and deliver it quietly and more efficiently than any 9-inch. The FN988 case is compatible with all 8.8-inch gears, differentials, and spools.

Product features:

* Patent-pending design utilizes an 8.8 gear set, which is quieter and more efficient than standard 9-inch components
* 31-spline Eaton Truetrac 8.8-inch differential
* Available in the following gear ratios: 3.08, 3.27, 3.55, 3.73, and 4.10
* Continuous lubrication of pinion bearings provided by internal oil channels
* High-strength nodular cast iron case
* Premium ring and pinion utilizing ARP ring bolts with safety wire
* Solid pinion preload spacer
* Forged alloy steel carrier bearing caps
* 1350 forged steel pinion yoke with U-bolt kit
* Threaded jack bolt holes in mounting flange ease case removal from axle housing
* Case includes mounting holes for bolt-on accessories

Part Type

Third Member Complete Assembly

Data: v4.2 - Upd: 2026-09-27 18:01:34

Specifications

Product Attributes - Brand
Detroit Speed Inc
Product Attributes - Manufacturer's Part Number
070880-355DS
Product Attributes - Part Type
Third Member Complete Assembly
Product Attributes - Product Line
Detroit Speed FN988 Assembled Center Sections
Product Attributes - UPC
090127842812
Product Attributes - Case Style
Ford 9 in.
Product Attributes - Ring and Pinion Included
Yes
Product Attributes - Ring and Pinion Ratio
3.55:1
Product Attributes - Case Material
Nodular iron
Product Attributes - Main Cap Material
Steel
Product Attributes - Yoke Included
Yes
Product Attributes - Yoke Style
1350 Series
Product Attributes - Standard Pinion Location
Yes
Product Attributes - Ring Gear Load Bolt
No
Product Attributes - Bearings Included
Yes
Product Attributes - Main Cap Retention Style
Bolt
Product Attributes - Carrier Material
Cast iron
Product Attributes - Quantity
Sold individually.

Reference Information

Brand Name/s Detroit Speed Inc
StreetFX SKU dsr070880-355DS
SFX Item ID 5160086
Supplier Item Code 5160086
Manufacturer SKU 070880-355DS
Manufacturer UPC 90127842812
Alternative References FN988

Compatibility

Application Data
  • Carrier StyleDetroit Truetrac
    Axle Spline Quantity31
    Axle ModelFord 9 in.

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