QA1 R140-170 Rear Suspension System 88-98 C1500 Single AdjustableQA1 R140 170 Rear Suspension System 88 98 C1500 Single Adjustable Add modern performance to a pickup that was designed for utility ? all without removing the bed of the truck. QA1 engineered a unique design offering 4" to 7" drop that maximizes performance without the inherent binding issues of other 4 link systems. With superior control over suspension movement, you can easily dial in the stance for a smooth ride and great handling characteristics.