DSE Assembled Center Section FN988 Torque Arm - 3.55 Ratio - 31-Spline Truetrac - 1982-2002 Camaro / Firebird - 070881-355DS
Upgrade the rear drivetrain in your 1982-2002 Chevrolet Camaro or Pontiac Firebird with the Detroit Speed FN988 Torque Arm Assembled Center Section. Part number 070881-355DS combines a 3.55 gear ratio, 31-spline Truetrac differential, integral torque arm mount, and heavy-duty 1350-series yoke in a performance-focused assembly engineered for third- and fourth-generation F-Body applications with 9-inch axle housings. The FN988 brings together the dropout-center-section advantages of a 9-inch-style housing with the quieter, more efficient operation of a Ford 8.8-inch gearset, giving serious street, Pro Touring, and competition builds a strong and refined driveline solution.
Detroit Speed builds the FN988 Torque Arm assembly around a high-strength nodular iron case machined to precise tolerances and reinforced with forged steel bearing caps for high-horsepower reliability. The integrated torque arm mount eliminates the additional brackets commonly required when adapting a 9-inch housing to a third- or fourth-generation F-Body, improving packaging in an area where space is already tight. The complete assembly includes a 31-spline Truetrac differential, Ford Racing gearset, high-quality bearings, and a heavy-duty 1350-series yoke. This 070881-355DS version uses standard gears and is not REM polished.
Specifications
- Part Number: 070881-355DS
- Product Type: Differential Assembly
- Case Series: FN988 Torque Arm
- Gear Ratio: 3.55
- Differential: 31-Spline Truetrac
- Axle Shaft Spline Quantity: 31
- Carrier Style: Ford 8.8-inch
- Case Material: Nodular Iron
- Bearing Caps: Forged Steel
- Yoke Style: 1350-Series
- Torque Arm Mount: Integral
- REM Polished: No
- Universal 9-inch Center Section: No
- Application Specific: Yes
Features
- FN988 Torque Arm center section engineered for third- and fourth-generation GM F-Body applications
- 3.55 gear ratio
- 31-spline Truetrac differential delivers smooth, predictable power distribution and improved traction
- Ford 8.8-inch gearset provides quiet, efficient operation
- Dropout center section installs into compatible 9-inch axle housings
- Integral torque arm mount eliminates additional brackets commonly required with 9-inch housing conversions
- High-strength nodular iron case machined to precise tolerances
- Forged steel bearing caps provide additional strength for high-horsepower applications
- Ford Racing gearset
- High-quality bearings
- Heavy-duty 1350-series yoke for high-torque durability
- Eliminates C-clip axles when used with the appropriate 9-inch housing configuration
- Precision assembled to Detroit Speed standards for performance and reliability
- Designed for Pro Touring, high-performance street, and competition builds
Fitment
- 1982 Chevrolet Camaro
- 1982 Pontiac Firebird
- 1983 Chevrolet Camaro
- 1983 Pontiac Firebird
- 1984 Chevrolet Camaro
- 1984 Pontiac Firebird
- 1985 Chevrolet Camaro
- 1985 Pontiac Firebird
- 1986 Chevrolet Camaro
- 1986 Pontiac Firebird
- 1987 Chevrolet Camaro
- 1987 Pontiac Firebird
- 1988 Chevrolet Camaro
- 1988 Pontiac Firebird
- 1989 Chevrolet Camaro
- 1989 Pontiac Firebird
- 1990 Chevrolet Camaro
- 1990 Pontiac Firebird
- 1991 Chevrolet Camaro
- 1991 Pontiac Firebird
- 1992 Chevrolet Camaro
- 1992 Pontiac Firebird
- 1993 Chevrolet Camaro
- 1993 Pontiac Firebird
- 1994 Chevrolet Camaro
- 1994 Pontiac Firebird
- 1995 Chevrolet Camaro
- 1995 Pontiac Firebird
- 1996 Chevrolet Camaro
- 1996 Pontiac Firebird
- 1997 Chevrolet Camaro
- 1997 Pontiac Firebird
- 1998 Chevrolet Camaro
- 1998 Pontiac Firebird
- 1999 Chevrolet Camaro
- 1999 Pontiac Firebird
- 2000 Chevrolet Camaro
- 2000 Pontiac Firebird
- 2001 Chevrolet Camaro
- 2001 Pontiac Firebird
- 2002 Chevrolet Camaro
- 2002 Pontiac Firebird
Fitment Note: Fits 1982-2002 Chevrolet Camaro and Pontiac Firebird third- and fourth-generation F-Body applications with 9-inch axle housings. Compatible with the Detroit Speed torque arm rear axle housing. This center section is not compatible with the factory rear axle assembly.
FAQs
What is included with the 070881-355DS FN988 Torque Arm center section?
The assembly includes a fully assembled center section with a 31-spline Truetrac differential, ring and pinion, and 1350-series yoke. This specific version has a 3.55 gear ratio.
Why does the FN988 use an 8.8-inch gearset?
The FN988 combines the dropout-center-section configuration of a 9-inch-style housing with the quieter and more efficient operation of the Ford 8.8-inch gear design. The result is a performance-oriented assembly engineered to provide strength, driveline control, and refined operation.
Is 070881-355DS compatible with a factory Camaro or Firebird rear end?
No. This FN988 Torque Arm center section is designed for 9-inch axle housings in third- and fourth-generation Camaro and Firebird applications and is compatible with the Detroit Speed torque arm rear axle housing.
Why Buy from Beefcake Racing?
Beefcake Racing is your source for proven performance drivetrain, suspension, and chassis components for street, Pro Touring, autocross, and track builds. If you need help matching the Detroit Speed FN988 center section, axle housing, or other rear-end components to your Camaro or Firebird build, our experienced team is ready to help. Email sales@beefcakeracing.com or call 1-855-827-7223 for assistance.
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