# Eaton Posi Differential 17 Spline 3.90 & Down Ring Gear Pinion Ratio Rear 8.2in The Eaton Posi limited-slip differential is the perfect way to control traction in street rods, light duty pickups and all types of tarmac running race cars. Featuring pyrolytic carbon clutches, rebuildable design, net-forged gears for added strength and seamless, automatic operation. - Tunable via various spring packs \[a.k.a. pre-loads\] - Pyrolytic Carbon Clutch Disc Technology - Clutch Type Limited Slip Differential - Smooth; Automatic Engagement - Precision-Forged Gears - Prevents Wheel Slip - Rebuildable 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 300 1964 Chevrolet Chevelle Malibu 1964 Chevrolet Chevelle Malibu Super Sport 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 1958-1961 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 ## Details - **Price:** 1093.84 CAD - **Vendor:** Eaton - **Type:** Differentials ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 1093.84 CAD | In stock | ## Images - Photo - Primary - Photo - Primary - Photo - Primary - Photo - Unmounted --- > Source: [Standard Auto Part](https://www.standardautopart.com/products/eaton-posi-differential-17-spline-3-90-down-ring-gear-pinion-ratio-rear-8-2in) > Updated: 2026-06-27