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The internal oil pump is actually driven off of the pinion gear. It requires a special pinion with a hex cut into the end of it, and the pump's driveshaft slots into the end of it. Cook says he purchases his pumps and pinions from G-Force South in Asheboro, N.C.
Rearend Maintenance - Rear Gear Checkup

 The internal oil pump is actually driven off of the pinion gear. It requires a special pinion with a hex cut into the end of it, and the pump's driveshaft slots into the end of it. Cook says he purchases his pumps and pinions from G-Force South in Asheboro, N.C.  View Related Article

 

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