Detroit Speed Third Member Assembly 31-Spline With 8.8 Truetrac Gearset Ford 9”

CJ's Part Number:
70880-V

Highlights

  • High-Strength Nodular Case
  • Eaton Truetrac Differential
  • Bolt-On Installation
  • Available In Several Ratios
From
$2,499.95
Earn
points.
Only %1 left
Product Description

Detroit Speed Ford 9” 31-Spline Third Member Assembly with 8.8 Truetrac Gearset.

For those serious about their performance build, the Detroit Speed Ford 9” 31-Spline Third Member Assembly with 8.8 Truetrac Gearset delivers. With its patent-pending 31-spline Eaton Truetrac 8.8-inch differential, this assembly provides a quieter and more efficient gearset than standard 9-inch components. Plus, the internal oil channels continuously lubricate the pinion bearings, ensuring superior durability. The high-strength nodular cast iron case, coupled with a premium ring and pinion utilizing ARP ring bolts with safety wire, offers added strength and safety.

Features and Benefits:
- Patent-pending 31-spline Eaton Truetrac 8.8-inch differential
- Quieter and more efficient gearset than standard 9-inch components
- 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
- Available in the following gear ratios: 3.08, 3.27, 3.55, 3.73, and 4.10

The carrier-bearing caps are forged from alloy steel for even more added durability. The 1350 forged steel pinion yoke with U-bolt kit and jack bolt holes in the mounting flange make for easy case removal from the axle housing, while the case includes mounting holes for bolt-on accessories. With several gear ratios to choose from, you can tailor your assembly to meet your exact needs.

Vehicle Fitment:
- 1965-1973 Mustangs
- 1966-1977 Broncos
- 1948-1979 F-100s

Tech Tip:
- The FN988 case is compatible with all 8.8-inch gears, differentials, and spools. Alternate options are available. Contact us for custom builds or combinations not listed.

California Residents: Proposition 65 Warning

Related Categories: Mustang Parts, Mustang Rear Axle, Mustang Differentials, Mustang Ring & Pinion Gear Sets, Ford Bronco Parts

Installation & Fitment

Vehicle Fitment

This product will fit the following Bronco years:

This product will fit the following F-100 years:

  • 1948,
  • 1949,
  • 1950,
  • 1951,
  • 1952,
  • 1953,
  • 1954,
  • 1955,
  • 1956,
  • 1957,
  • 1958,
  • 1959,
  • 1960,
  • 1961,
  • 1962,
  • 1963,
  • 1964,
  • 1965,
  • 1966,
  • 1967,
  • 1968,
  • 1969,
  • 1970,
  • 1971,
  • 1972,
  • 1973,
  • 1974,
  • 1975,
  • 1976,
  • 1977,
  • 1978,
  • 1979,

This product will fit the following Mustang years:

Questions & Answers
Only registered users can ask/answer questions. Please sign in or create an account.
Reviews
Write Your Own Review
Only registered users can write reviews. Please Sign in or create an account