KYB KG5512 Gas-a-Just Rear Shock 1962-1978 Chrysler/Dodge/Plymouth Sold Each

Vehicle Fitment

• 1965-1969 Chrysler 300 (RWD) - Rear
• 1975-1976 Chrysler Cordoba - Rear
• 1967-1969 Chrysler Imperial - Rear
• 1974-1975 Chrysler Imperial - Rear
• 1965-1969 Chrysler New Yorker (Exc. Air Suspension) - Rear
• 1974-1978 Chrysler New Yorker (Exc. Air Suspension) - Rear
• 1965-1969 Chrysler Newport - Rear
• 1974-1978 Chrysler Newport - Rear
• 1965-1970 Chrysler Town & Country (Pre-1990) - Rear
• 1974-1978 Chrysler Town & Country (Pre-1990) - Rear
• 1963-1964 Dodge 330 - Rear
• 1963-1964 Dodge 440 - Rear
• 1970-1974 Dodge Challenger - Rear
• 1966-1976 Dodge Charger (RWD) - Rear
• 1965-1976 Dodge Coronet - Rear
• 1965-1970 Dodge Monaco - Rear
• 1972-1976 Dodge Monaco - Rear
• 1977-1978 Dodge Monaco (with Police Package) - Rear
• 1962-1970 Dodge Polara - Rear
• 1972-1973 Dodge Polara - Rear
• 1970-1974 Plymouth Barracuda - Rear
• 1970-1974 Plymouth Cuda - Rear
• 1962-1970 Plymouth Belvedere - Rear
• 1962-1976 Plymouth Fury - Rear
• 1977-1978 Plymouth Fury (with Police Package) - Rear
• 1975-1977 Plymouth Gran Fury - Rear
• 1967-1971 Plymouth GTX - Rear
• 1968-1975 Plymouth Road Runner (incl. Superbird) - Rear
• 1965-1974 Plymouth Satellite - Rear

Fitment Notes

• Sold individually - two shock absorbers are required for a complete rear axle replacement. Order two units for a full rear installation.
• Position: Rear - fits both left and right sides (same part number for both sides).
• Does NOT fit vehicles equipped with Air Suspension or Electronic Leveling systems (e.g., air-suspended New Yorker and Newport variants). Verify your vehicle's suspension configuration before ordering.
• Chrysler 300 and Dodge Charger fitment applies to RWD configurations only.
• The KG5512 serves two confirmed purposes: it is the correct OE monotube replacement for vehicles factory-equipped with a monotube rear shock, AND it is a documented performance upgrade for vehicles factory-equipped with a conventional twin-tube rear shock absorber.
• Designed and valved specifically for classic Mopar B-body, C-body, and E-body platforms - not a generic universal shock.
• Dust cover is included with this unit.
• Factory mounting hardware (shock bolts) is reused during installation. All new washers, bushings, and mounting hardware are included.

Features

• High-pressure monotube design - completely separates the nitrogen gas charge and hydraulic oil using a free-floating dividing piston, permanently eliminating oil aeration and performance fade that affect conventional twin-tube rear shock absorbers.
• Components and valving designed specifically for classic Mopars - the KG5512 is not a generic application; its damping calibration is purpose-built for the rear suspension geometry and mass of Chrysler, Dodge, and Plymouth B-body, C-body, and E-body platforms.
• Delivers up to 25% more damping performance over original equipment twin-tube rear shocks - translating to reduced body squat under acceleration, less rear-end wallow through corners, and more controlled ride behavior under all conditions.
• Two separate working chambers: an air-free hydraulic piston and valve area for precise, fade-free control, plus a second high-pressure nitrogen gas chamber with a floating piston that provides comfortable damping during normal driving and delivers instant added performance on demand.
• Velocity-sensitive valving automatically and continuously adjusts rear damping in real time to match road inputs and driving conditions - no driver adjustment or electronic control required.
• Ideal for classic Mopar builds running heavier aftermarket wheels and tires - the Gas-a-Just's high-pressure monotube design automatically adds additional damping under heavier loading conditions where conventional twin-tube shocks fade.
• Triple chrome-plated piston rod - ultra-smooth surface finish minimizes seal friction and wear for consistent, quiet performance over the full service life of the unit.
• Seamless cylinder and seamless eye-ring construction - completely eliminates seam-related failure modes under sustained heavy use and high cornering loads.
• Dust cover included - protects the piston rod from road grit, debris, and salt contamination during normal driving.
• Lifetime Limited Warranty to the original vehicle purchaser - covers defects in materials and workmanship for as long as the original purchaser owns the vehicle on which the shocks are installed.

Specifications

• Part Number: KG5512
• Series: Gas-a-Just
• Type: Shock Absorber (Rear)
• Design: High-pressure monotube with floating piston
• Position: Rear - fits both Left and Right sides
• Extended Length: 22.64"
• Compressed Length: 13.98"
• Stroke: 8.66"
• Upper Mount Type: E2 (12.8 x 41.3)
• Lower Mount Type: E1 L/E (17.5)
• Internal Rebound Spring: No
• Internal Rebound Bumper: No
• Dust Cover: Included
• Piston Rod Finish: Triple chrome plated
• Cylinder: Seamless construction
• Eye-Ring: Seamless construction
• Quantity: Sold individually (2 required per vehicle)
• Warranty: Lifetime Limited Warranty to original purchaser

Included Components

• 1x KYB KG5512 Gas-a-Just Rear Shock Absorber
• 1x Dust Cover
• 1x Hardware Kit (washers, bushings, and mounting hardware)

Product Description

The KYB KG5512 is a Gas-a-Just high-pressure monotube rear shock absorber engineered specifically for the rear suspension of classic Chrysler, Dodge, and Plymouth vehicles spanning the 1962-1978 model years. This is a purpose-built Mopar application - the damping calibration is designed specifically for the rear suspension geometry and vehicle mass of the B-body, C-body, and E-body platforms that underpin some of the most iconic American muscle cars and full-size cars of the era, including the Dodge Charger, Dodge Challenger, Plymouth Barracuda, Plymouth Cuda, Plymouth Road Runner, Plymouth GTX, Dodge Coronet, Plymouth Satellite, and the full range of Chrysler, Dodge, and Plymouth full-size sedans and wagons. Air-suspended variants of the New Yorker and Newport are excluded, and the Chrysler 300 and Dodge Charger fitment is limited to RWD configurations. Each unit is sold individually - two are required for a complete rear replacement.

The KG5512 serves two confirmed purposes for Mopar owners: it is the correct OE-specification replacement for vehicles that came factory-equipped with a monotube rear shock, and it is a documented performance upgrade for vehicles that came from the factory with a conventional twin-tube design. The high-pressure monotube architecture permanently separates the nitrogen gas charge from the hydraulic fluid using a free-floating dividing piston, completely eliminating the oil aeration and fade that reduce the performance of conventional twin-tube units under sustained use. The result is up to 25% more rear damping force than stock twin-tube shocks - which translates to meaningfully reduced body squat under acceleration, less rear-end wallow in corners, and more predictable behavior at the rear axle under all driving conditions. For builds running larger, heavier aftermarket wheels and tires, the monotube design automatically adds additional damping under the increased unsprung weight load, which conventional twin-tubes cannot replicate.

Velocity-sensitive valving automatically adjusts damping in real time to match changing road and driving inputs without any driver adjustment required. The triple chrome-plated piston rod, seamless cylinder, and seamless eye-ring construction collectively deliver long-term reliability under the sustained loads these classic platforms generate. A dust cover is included with each unit to protect the piston rod from contaminants during operation. The KG5512 is covered by KYB's Lifetime Limited Warranty against defects in materials and workmanship for as long as the original purchaser owns the vehicle on which the shocks are installed.