Monroe MA770 Air Suspension Shock - Rear

Monroe Max-Air MA770 Air Shock Absorber

The Monroe Max-Air Air Shock Absorber MA770 is built for rear suspension support on Ford Ranger and Mazda B-Series trucks used for towing and hauling. It can be inflated or deflated up to 150 PSI to help maintain ride height when extra load is added, with capacity limited by the vehicle’s suspension, tires, and transmission.

Monroe’s Max-Air line focuses on adjustable air pressure control for load-leveling applications. For trucks that see frequent cargo, trailer, or work-duty use, this rear air shock provides a practical way to fine-tune suspension support without changing the vehicle’s basic setup.

• Adjustable air pressure up to 150 PSI for load-leveling support
• Rated by the manufacturer for additional weight up to 1,200 lbs., subject to vehicle limits
• Rear air shock absorber for towing and hauling applications
• Compressed length: 15.875 in.; extended length: 26.375 in.; travel length: 10.5 in.
• Loop bushing upper mount and loop bushing & sleeve lower mount
• Dust shield with rubber material
• Compressed and extended bumper stops included in the shock design

Fitment and Application

• Fits 1998-2011 Ford Ranger, rear; air suspension shock for towing and hauling; replacement requires separate left and right fill system with AK18 or AK64 Air Line Kit.
• Fits 1998-2009 Mazda B4000, rear; air suspension shock for towing and hauling; replacement requires separate left and right fill system with AK18 or AK64 Air Line Kit.
• Fits 1998-2008 Mazda B3000, rear; air suspension shock for towing and hauling; replacement requires separate left and right fill system with AK18 or AK64 Air Line Kit.
• Fits 1983-1997 Ford Ranger, rear; for towing and hauling; without rear stabilizer bar; use AK18 Air Line Kit to replace single air shock fill system if necessary; use AK64 Air Line Kit to add separate left and right air shock fill system if desired.
• Fits 1994-1997 Mazda B3000, rear; for towing and hauling; without rear stabilizer bar; use AK18 Air Line Kit to replace single air shock fill system if necessary; use AK64 Air Line Kit to add separate left and right air shock fill system if desired.
• Fits 1994-1997 Mazda B4000, rear; for towing and hauling; without rear stabilizer bar; use AK18 Air Line Kit to replace single air shock fill system if necessary; use AK64 Air Line Kit to add separate left and right air shock fill system if desired.

What It Helps Address

• Rear-end sag when carrying tools, cargo, or trailer tongue weight
• Uneven ride height after adding load to a Ford Ranger or Mazda B3000/B4000
• Reduced suspension support during towing and hauling
• Need for adjustable rear shock pressure to match changing payloads

Installation Notes and Tips

Verify the vehicle’s rear suspension configuration before ordering, especially on 1983-1997 Ford Ranger and 1994-1997 Mazda B3000/B4000 applications that note use without a rear stabilizer bar. Air line routing and fill setup are application-specific; some vehicles require an AK18 Air Line Kit to replace a single-fill system, while others can use an AK64 Air Line Kit for separate left and right adjustment.

Part number MA770 is a direct reference for this Monroe Max-Air application, and it cross-references Monroe Shocks & Struts 172286 for the same application.

Quality Assurance

Monroe Max-Air shock absorbers are engineered for load-leveling use on trucks that need adjustable rear suspension support. MA770 is built around Monroe’s air-adjustable shock design for Ford Ranger and Mazda B-Series rear applications, with fitment defined by the vehicle’s suspension configuration and the listed mounting dimensions.