units are equipped with carbon fiber clutches and are available for 10 and 12 bolt gm ... passenger car and truck rears as well as 8.8 ford rears most of ... axle splines 57131 57311 58911 58912 9 ford posi-traction .401.00 ... 9 ford posi-traction .408.00 ... 381.00 we stock all the internal parts for the eaton positraction call us for ... parts 19554 19555 12 bolt eatontm posi- ... type auburnŽ posi-traction 31 spline clutch type ford motorsports posi-traction 30 ... spline light duty clutch type torque-lineŽ posi-traction 30 ... spline light duty clutch type torque-lineŽ posi-traction 30 ... spline with 400 lb clutch preload for 3.08 to 4.10 ratios 28 ... spline with 400 lb clutch preload for 4.10 and up ratios 19555-33 ... .711.60 33 spline with 400 lb clutch preload for 4.10 and up ratios 19556 ...