Firestone "Coil-Rite" air bag helper springs are designed to fit inside the existing coil spring suspension creating a variable rate spring. These air bags are made of durable, elastic polyurethane providing years of comfort and stability to your vehicle. "Coil-Rite" air bags enable adjustment for varying loads and road conditions by inflating or deflating the springs. Performance can be altered as easily as inflating a tire. Installed between the frame of the vehicle and the suspension providing load support through the use of air pressure.

Features and Benefits

  • Firestone # 4100 Air Bags are custom fit for the GMC Truck
  • Easy installation (1 to 2 hours)
  • Will handle loads capacities up to 500-1000 lbs*
  • Reduce suspension fatigue
  • Improve steering and balance
  • Increase vehicle stability
  • Prevent "bottom" out
  • Limited Lifetime Warranty

Installation Notes

1. Do NOT exceed the vehicles Recommended Gross Vehicle Weight Rating (GVWR)

Tech Specs

Weight: 13 lbs.
Part 4100 fits:
  • 1987 GMC Truck
  • 1986 GMC Truck
  • 1985 GMC Truck
  • 1984 GMC Truck
  • 1983 GMC Truck
  • 1982 GMC Truck
  • 1981 GMC Truck
  • 1980 GMC Truck
  • 1979 GMC Truck
  • 1978 GMC Truck
  • 1977 GMC Truck
  • 1976 GMC Truck
  • 1975 GMC Truck
  • 1974 GMC Truck
  • 1973 GMC Truck

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