Ford 9″ diff center, 3.89 to 1 ratio, LSD posi traction with nodular cast iron housing. These third members have heat treated spider gears and a spring loaded clutch pack for extra grip. The crown wheel and pinion are made of 8620 chrome-nickel moly steel and heat treated. Centers have been lapped for correct tooth contact. They have 3.062 carrier bearings and a 1310 short yoke.
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These centers must be used with the correct oil and run as per instructions.