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1999-2002 Freightliner FC80
Plymouth Torqueflite A727 and A904 automatic transmissions
1980-1985 GMC C3500
1978-1983 Oldsmobile Cutlass Supreme
Installs externally or in-tank
Detroit Locker Differential - 31 Spline 30009BL 1999-2002 Freightliner FC80Detroit Locker Differential 187C145A 31 Spline 1. 32 in. Axle Shaft Diameter Most Durable Dependable Maximizes Traction Engineered To Keep Both Wheels In Drive Mode Choice Of Professionals Off Road Enthusiasts The legendary Detroit Locker began the revolution in performance differentials and still leads the industry today as an Eaton brand. The Detroit Locker is the most durable and dependable locking differential available. The Detroit Locker
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