Oldsmobile Bravada Rear Gas Shocks Replacement Kit. It is highly recommended that Bravada gas shocks be replaced about every 50,000 miles to maintain the vehicles suspension. The shocks are what stop the vehicle from bouncing excessively, when converting to coil springs it would be a great idea to replace the shocks as well. Your brand new Gas Shocks will help your vehicle with braking, handling and fuel economy. The Heavy Duty Kit is recommended for SUV’s with 3rd Row Seating and for Light Towing Capabilities.