Ford 9 in. 31 Spline LSD TorqueWorm® Nodular Iron Third Member Assembly

No Reviews yet
MPN: PCE215.2101 UPC: 840136570103
Unavailable Extended Warranty Unavailable
$1,102.50 to $1,172.50 $1,365.00

Build to Order


Speedmaster Ford 9 in. third member assemblies are designed to help you get that horsepower to the ground. They include high quality nodular iron thru-bolt design center section, as well as our famous TorqueWorm geared limited slip differential, 1350 series yoke, daytona pinion support, and gear ratio. Whether you're assembling a daily driver, street rod, or race car, Speedamster's third member assemblies will provide the durability that your vehicle deserves.


Part Number:PCE215.2101
Part Type:Third Member Complete Assembly
Case Style:Ford 9"
Case Material:Nodular Steel
Main Cap Material:Steel
Main Cap Retention Style:Thru Bolt
Carrier Bearing Diameter (in):3.006 in.
Pinion Support Bolt Quantity:5
Standard Pinion Location:Yes
Ring Gear Load Bolt:No
Ring and Pinion Included:Yes
Ring and Pinion Ratio:All Ratios Available
Yoke Included:Yes
Yoke Style:1350 Series
Bearings Included:Yes
Carrier Type:31-Spline Speedmasterª TorqueWorm¨ LSD
Quantity:Sold individually.
CalculatorGear Ratio Calculator


CASE: Our Nodular Iron center sections will give you the perfect foundation for a high-quality, bulletproof rear differential, with a through bolt design and extra material is added to the bearing caps. These cases are offered in 3.062" & 3.250" bearing diameter to accommodate 28, 31, and 35-spline carriers and spools.

The TORQUEWORM is a torque biasing 6 pinion gear type limited-slip unit. This is a preloaded unit allowing for a faster-reacting unit. Unlike our competitors that only use 3 or 4 pinion gears. The use of 6 pinion gears means the stress on gears is spread over a greater surface area, reducing the load on all internal components. The internal components are made from EN36 Material as used in racing such as V8 SUPERCAR. The outer cases made from 8620 Chrome-Nickel-Moly steel and the case hardened for long life and improved strength.

The GEARSETS used are HI-PERFORMANCE 8620 Chrome-Nickel-Moly Steel. CNC machined from high-quality forgings to our exacting specifications and then heat-treated to obtain high impact and durability. Then lapped to allow for correct tooth contact and smoothness and for use in the performance market. The 8620 Gearset has proven itself in all forms of motorsport over the past 30 years.

YOKE: Speedmaster TDS Billet yokes are a long style unit fully CNC machined to our specifications.

NOTE: These 3rd members are to be used with a mineral-based oil of a range of EP140 Extreme pressure at a minimum, NO 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 warranty.

Brand Information


Prop 65 Warning

This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Ratings & Reviews

No reviews available

Be the first to Write a Review