rd960cReyco Granning’s R-Series suspension is the fast and easy way to upfit your Chevy/GMC with an option the factory doesn’t offer.  Upgrade to the outstanding performance and safety of a drive-axle air suspension.  This system provides the benefits that the factory leaf spring suspension cannot:

  • Kneeling- On command, exhaust the air to significantly lower the tailgate for easy loading and unloading of gear and passengers.
  • Improved Ride- Maximum comfort and unmatched protection of precious cargo.
  • Managed Chassis Height- The height, ground clearance, and driveline angles are all maintained regardless of payload.

The system provides everything you need and is designed to accommodate the packaging of all factory chassis systems without the need for welding or costly modifications.  For example, we use lateral pads to react cornering forces, eliminating the need for a traditional transverse rod mounted between the axle and frame.  This arrangement permits frame cross members, fuel tanks, and exhaust systems between the frame rails. It further eliminates the need to weld an expensive transverse rod bracket on top of the axle.  Field-proven for over 20 years, the R-Series conversion kits are custom designed for the Chevy 4500 Express/GMC 4500 Savana models.  The fit is precise and the bolt-on kit installs in half the time of the leading competitor.

The R-Series® and AirMaster® can be purchased separately or they can be purchased together to form a TransportMaster® system, click here for more information.



  • Delivers smooth air ride comfort, loaded or empty or towing
  • Enhances the ride, safety and value of the truck
  • Fast, easy, low-cost installation
  • Bolts directly to OEM chassis — no frame-welding
  • Custom designed for Chevrolet and GMC trucks
  • Does not affect truck’s load-carrying capacity
  • Self-leveling system maintains optimal ride height regardless of load
  • Twin height control valves maintain ride height side to side
  • Z-beam “big rig” design boosts roll stiffness and reduces body lean
  • Custom-tuned monotube shocks enhance ride and stability and shock life
  • Design minimizes stress on OEM frame-members
  • Utilizes key OEM components to reduce installation costs
  • Conversion does not affect OEM warranty
  • Cab control of rear air dumps to kneel/raise vehicle for easy trailer hook-up and rear-door loading
  • Ambulance air control kit offers faster air-dump/air-up
  • Meets all Chevy/GMC ship-through specs
  • Field-test proven for 20+ years
  • Reyco Granning Air Suspensions offer the most reliable, affordable, fully engineered systems for a wide range of Shuttle Bus, Ambulance, RV and Work Truck markets for Ford, GM, Ram and EV chassis.
Northeast USA & Eastern Canada

Marc Tarbay

Regional Sales Manager

Cell: 417-860-4281

US States: Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, Virginia, West Virginia.
Canadian Provinces: Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, Quebec, and Saskatchewan.

Northwest USA & Western Canada

John McMullen

OEM Account Manager

Cell: 417-461-4993

US States: Hawaii, Idaho, Oregon, Washington.
Canadian Provinces: Alberta, British Columbia

Mexico & Latin America

Rodrigo Esperanza

Regional Sales Manager

Cell: +52-442-592-3617

Mexico: All states.
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama.

Western USA & Canada

John McMullen

OEM Account Manager

Cell: 417-461-4993

US States: Arizona, California, Hawaii, Idaho, Nevada, Oregon, Utah, Washington.
Canadian Provinces: Alberta, British Columbia

USA - Central

Rod Caldwell

Regional Sales Manager

Cell: 417-440-9004

US States: Illinois, Indiana, Iowa, Kentucky, Michigan, Minneapolis, Ohio, Wisconsin.

USA - Southeast

Andy Freeman

Regional Sales Manager

Cell: 765-543-5815

US States: Alabama, Florida, Georgia, Louisiana (Eastern Portion), Mississippi, North Carolina, South Carolina, Tennessee.

USA - Rocky Mountains

Tim Dawes

Regional Sales Manager

Cell: 417-461-4762

US States: Arkansas, Colorado, Kansas, Louisiana (Western Portion), Missouri, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, Wyoming.

USA - West

Paul Jarvis

Regional Sales Manager

Cell: 417-366-0479

US States: Arizona, California, Nevada, and Utah.