KYB Suspension Shock Absorber P/N:KG4504

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$71.99
MPN: KG4504
UPC: 781552045045
Item Package Quantity: 1
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KYB Suspension Shock Absorber P/N:KG4504
KYB Suspension Shock Absorber P/N:KG4504
$71.99

Firm up the front end of your classic pony car with the KYB Gas-a-just Shock Absorber KG4504, a high-pressure monotube gas shock that drops in as a front-position replacement for the 1971-1973 Ford Mustang and the 1971-1973 Mercury Cougar. This KYB shock absorber has components and valving designed specifically for Mustangs and Cougars, so it's tuned to these applications rather than a generic fit.

  • Monotube gas design: The high-pressure monotube keeps the nitrogen gas and oil separated for fade-free operation and instant response, avoiding the aeration that can affect traditional twin-tube shocks.
  • Two working chambers: An air-free hydraulic piston and valve area handles responsiveness and control, while a high-pressure nitrogen area with a floating piston is designed for a comfortable ride during normal driving.
  • Higher gas pressure: Responds quickly to help improve steering response, and adds up to 25% more damping over original-equipment shocks — useful on vehicles that work, tow, or run larger, heavier tires and wheels.
  • Triple chrome-plated piston rod: An ultra-smooth chrome piston rod is designed to reduce seal wear, since leaking fluid can be a cause of shock failure.

KYB notes this Gas-a-just also helps keep electronic safety systems performing as designed, since those systems depend on the suspension working as intended.

Interchange: 81491 · 5823

This part cross-references / interchanges with the following part numbers:

81491, 5823

Frequently Asked Questions

What vehicles does the KYB KG4504 fit?

It's a front-position gas shock for the 1971-1973 Ford Mustang and 1971-1973 Mercury Cougar. Check the Buyer's Guide tab to confirm the fit for your exact vehicle.

What makes this a KYB gas shock absorber?

It's a high-pressure monotube design that separates the nitrogen gas from the oil, which helps provide fade-free operation and instant response compared to a traditional twin-tube shock.

How much damping does it add over stock?

KYB states the Gas-a-just adds up to 25% more damping performance over original-equipment shocks, with valving designed specifically for Mustangs and Cougars.

Should I replace both front shocks at once?

This listing is for one shock. Replacing both front shocks together as a matched pair is recommended so the front suspension responds evenly side to side.

How do I know if my shock needs replacing?

Signs a shock may need replacing include fluid leaking from the body, excessive bouncing, poor ride control, or uneven tire wear. Diagnose the cause before ordering.