Ford 9" Complete 3rd Member with 3.70 Gear and 31 Spline Positraction Carrier. This 3rd member set includes a new reinforced forged iron case with 3.25" bearing caps.

The clutch style posi-traction unit is a proven combination and a better alternative for street driven cars vs the more expensive locker and spool options that are often overkill and not nearly as smooth on the street. It features heat treated spyder gears and spring loaded clutch pack with improved grip over OEM design. This unit is based off the proven original limited slip design with upgrades for a long lasting combination.

The ring and pinion is a 3.70 ratio and made of 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. 3.50:1, 3.70:1, 3.89:1, 4.11:1 and 4.56:1 gear ratio's are available in this combination.

Unit features a 1310 cast differential yoke.

Ford 9" Complete Positraction 3rd Member 3.70 Gear 31 Spline Posi Differential