1-215-003-04 Ford 9-in. LSD TorqueWorm HD Complete Third Member Assembly - 31 Spline [3.70:1 Ratio]

Name: 1-215-003-04 Ford 9-in. LSD TorqueWorm HD Complete Third Member Assembly - 31 Spline [3.70:1 Ratio]
Brand: SPEEDMASTER
SKU: 746-1-215-003-04
Price: 1690.00 USD
Availability: InStock

^$1,690⁰⁰

Ships on 09/14/2026

Lowest Price Guarantee

31-Spline Third Member Assemblies

Ford 9-in. LSD TorqueWorm HD Third Member Assembly

Aluminum Case, Main Cap

31-Spline

3.70:1 Ratio

Includes:

1350 Series Yoke
8620 Steel Gears
3.250 in. Carrier Bearing
Ring and Pinion
Bearings
(10) Pinion Bolts

1-215-003-04 Features:
- LSD (Limited Slip Differential)
- HD ( Heavy Duty)
- Ford 9 in. Aluminum Case Rated to 1,000+ HP

Ready-to-Install Third Member Assemblies

Speedmaster Ford 9-in. Complete Third Member Assemblies feature a Torque Worm 6-pinion limited-slip or full-spool differential in 28 and 31-spline axle shaft configurations. Third Member Assemblies are available in your choice of the most popular gear ratios and contain a new A356-T6 aluminum case that is assembled with all-new bearings, seals, heavy-duty ring and pinion, one-piece billet (through bolt) main caps,12-point bolts, u-joints/u-bolts, and precision-machined 1350 billet steel yoke. The 1350-series yoke is ideal for all forms of motorsports ranging from V8 SUPERCAR through Group 1 Drag Racing.

HD-style cases are rated at 850 HP but limited due to the size of the spline axle shaft.
Ultra HD-style cases are rated at 1200 HP but limited due to the size of the spline axle shaft.

LSD (Limited Slip Differential)
HD ( Heavy Duty)

Note: Each Third Member is to be used with a mineral-based oil of a range of EP140 Extreme pressure at a minimum. DO NOT USE split grades eg. 85/140 (these are not recommended). Failure to use the correct oil can result in gear damage, noise and may void your manufacturer's warranty.

Part TypeThird Member Assembly

Product LineSpeedmaster Ford 9-in. Complete Third Member Assemblies

BrandSPEEDMASTER

Package Height11.6

Package Width14.0

Package Length19.8

Weight74.0 PG

Part CategoryPerformance Parts

Yoke IncludedYes

Case StyleFord 9 in.

Standard Pinion LocationYes

QuantitySold individually