Chrysler, Mopar 8 3/4 8.75 Sure-Trac II Helical Gear Posi Sure Grip 30 spline

  
DoctorDiff Sure-Trac II is a fully machined, forged steel 8.75 sure grip/posi differential which operates similar to an Eaton True-Trac. The Sure-Trac II incorporates 12 (6 per side) helical/worm gears instead of 4 for maximum strength and smooth, quiet operation. Use conventional 85 W 140, GL-5 grade gear lube.

Friction modifier additive is not necessary. Lightweight traction differential fits all 30 spline 8 3/4 axles. Use'69 and newer type (LM104949 bearings and LM104912 races).