Eaton Posi Differential 17 Spline 3.90 & Down Ring Gear Pinion Ratio Rear 8.2in

The Eaton Posi limited-slip differential prevents wheel slip before it can get started. To do that, carbon disc clutch packs, preloaded by a central spring assembly, are located behind each differential side gear. When torque input increases the clamping load on the clutch packs increases. That causes the chatter-free clutch packs to grab and transfer power to the other wheel. Muscle cars, hot rods and mild off-road vehicles should look to Eatonss limited-slip differential for their traction answers. And the fact is, Eatons Posi units are virtually bullet proof.
Installation Instructions


This Part Fits:

Year	Make	Model	Submodel
1955-1958	Buick	Century	Base
1959-1962	Buick	Electra	225
1959-1964	Buick	Electra	Base
1959-1964	Buick	Estate Wagon	Base
1959-1963	Buick	Invicta	Base
1959-1964	Buick	LeSabre	Base
1958	Buick	Limited	Base
1963-1964	Buick	Riviera	Base
1957	Buick	Roadmaster	75
1955-1958	Buick	Roadmaster	Base
1961-1964	Buick	Skylark	Base
1955-1958,1961-1964	Buick	Special	Base
1961-1964	Buick	Special	Deluxe
1964	Buick	Sportwagon	Base
1955-1958	Buick	Super	Base
1962-1964	Buick	Wildcat	Base
1955-1964	Chevrolet	Bel Air	Base
1955-1956	Chevrolet	Bel Air	Beauville
1955-1957	Chevrolet	Bel Air	Nomad
1958-1964	Chevrolet	Biscayne	Base
1960	Chevrolet	Biscayne	Fleetmaster
1958-1961	Chevrolet	Brookwood	Base
1964	Chevrolet	Chevelle	Base
1964	Chevrolet	Chevelle	SS
1962-1964	Chevrolet	Chevy II	Base
1962-1964	Chevrolet	Chevy II	Nova
1964	Chevrolet	Chevy II	Nova SS
1960-1964	Chevrolet	Corvair	Base
1960-1961,1964	Chevrolet	Corvair	Deluxe
1961	Chevrolet	Corvair	Lakewood
1960-1964	Chevrolet	Corvair	Monza
1962-1964	Chevrolet	Corvair	Monza Spyder
1955-1964	Chevrolet	Corvette	Base
1957-1958	Chevrolet	Del Ray	Base
1958-1964	Chevrolet	Impala	Base
1964	Chevrolet	Impala	SS
1959-1961	Chevrolet	Kingswood	Base
1964	Chevrolet	Malibu	Base
1955-1961	Chevrolet	Nomad	Base
1955-1957	Chevrolet	One-Fifty Series	Base
1959-1961	Chevrolet	Parkwood	Base
1955-1957	Chevrolet	Two-Ten Series	Base
1955-1957	Chevrolet	Two-Ten Series	Del Ray
1958	Chevrolet	Yeoman	Base
1964	Oldsmobile	442	Base
1955-1957	Oldsmobile	88	Base
1955-1957	Oldsmobile	88	Holiday
1955-1964	Oldsmobile	98	Base
1963-1964	Oldsmobile	98	Custom
1958-1964	Oldsmobile	98	Holiday
1961	Oldsmobile	Classic 98	Base
1961-1964	Oldsmobile	Cutlass	Base
1964	Oldsmobile	Cutlass	Holiday
1955-1956	Oldsmobile	Deluxe 88	Base
1958-1964	Oldsmobile	Dynamic 88	Base
1958-1964	Oldsmobile	Dynamic 88	Holiday
1961-1964	Oldsmobile	F85	Base
1962-1964	Oldsmobile	F85	Deluxe
1957-1964	Oldsmobile	Fiesta	Base
1957	Oldsmobile	Golden Rocket 88	Base
1962-1963	Oldsmobile	Jetfire	Base
1964	Oldsmobile	Jetstar 88	Base
1964	Oldsmobile	Jetstar 88	Holiday
1964	Oldsmobile	Jetstar I	Base
1955-1957,1961-1964	Oldsmobile	Starfire	Base
1957	Oldsmobile	Starfire	Holiday
1955-1964	Oldsmobile	Super 88	Base
1955-1964	Oldsmobile	Super 88	Holiday
1964	Oldsmobile	Vista Cruiser	Base
1964	Oldsmobile	Vista Cruiser	Custom
1957-1964	Pontiac	Bonneville	Base
1959-1962	Pontiac	Bonneville	Custom
1959-1964	Pontiac	Bonneville	Safari
1964	Pontiac	Catalina	2+2
1955-1964	Pontiac	Catalina	Base
1959-1964	Pontiac	Catalina	Safari
1962-1964	Pontiac	Catalina	Ventura
1955-1958	Pontiac	Chieftain	Base
1957	Pontiac	Chieftain	Custom Safari
1957	Pontiac	Chieftain	Custom Safari Transcontinental
1955,1958	Pontiac	Chieftain	Safari
1962-1964	Pontiac	Grand Prix	Base
1964	Pontiac	GTO	Base
1963-1964	Pontiac	LeMans	Base
1955-1964	Pontiac	Star Chief	Base
1955-1957	Pontiac	Star Chief	Custom
1958	Pontiac	Star Chief	Custom Safari
1958	Pontiac	Star Chief	Super Deluxe
1957-1958	Pontiac	Super Chief	Base
1961-1964	Pontiac	Tempest	Base
1961,1964	Pontiac	Tempest	Custom
1961-1962	Pontiac	Tempest	LeMans
1961-1964	Pontiac	Tempest	Safari
1960-1961	Pontiac	Ventura	Base