Suspension Upgrades for Quigley 4x4 and Advanced 4x4 Chevrolet Express Conversions A Chevrolet Express equipped with a Quigley 4x4 or Advanced 4x4 conversion already gains significantly more capability than a standard two-wheel-drive van. But many owners eventually want more. Additional ride height, improved shock control, larger tires, better ride quality, and improved suspension performance can make a major difference in how the van performs both on the highway and when traveling off pavement. WeldTec Designs develops suspension upgrades designed to enhance these existing 4x4 conversions rather than replace them. Keep Your Existing 4x4 Conversion These systems are intended for Chevrolet Express vans that have already been converted to four-wheel drive using an independent front suspension configuration. The goal is to retain the existing 4x4 drivetrain while improving the suspension around it. Depending on application, upgrades may address: Additional ride height Spring rate Shock performance Suspension travel Steering geometry Tire clearance Rear suspension height Loaded vehicle control This allows owners to build on the capability of their existing Quigley or Advanced 4x4 conversion. Add More Lift Height Many 4x4-converted Chevrolet Express vans are limited by the original conversion ride height. Additional suspension lift can provide more clearance for larger tires and help improve overall ground clearance for vehicles used on rough roads, campsites, desert trails, and adventure travel. A properly engineered lift system must account for: CV axle angles Control arm geometry Steering angles Alignment Shock travel Suspension travel Tire clearance WeldTec Designs approaches additional lift as a complete suspension system rather than simply adding spacers. Improve Ride Quality A 4x4 conversion does not automatically mean the suspension is optimized for the final vehicle weight or how the van is actually used. Camper builds, Class B RVs, commercial conversions, and adventure vans can carry significantly more weight than an empty Chevrolet Express. Upgraded springs and shocks can help improve: Harshness Excessive bouncing Rebound control Body movement Highway stability Rough-road comfort Loaded vehicle handling The result is a more controlled suspension system designed around the completed vehicle. Performance Shock Upgrades Shock absorbers are one of the most important components when improving the ride quality of a converted van. Proper shock length and valving can help control suspension movement without making the vehicle unnecessarily harsh. Performance shocks can improve control over: Expansion joints Highway dips Washboard roads Rough pavement Repeated bumps Off-road terrain Heavily loaded conditions Larger Tires and Increased Clearance Additional suspension height can also create room for larger tires, which can further improve ground clearance and off-road capability. Final tire size depends on several factors including: Model year Existing conversion Lift height Wheel offset Suspension configuration Fender clearance Vehicle weight Tire fitment should always be confirmed around the specific vehicle. Built for Vans, Camper Conversions and RVs Chevrolet Express 4x4 vehicles are used in a wide range of applications. WeldTec Designs suspension upgrades can be suited for: Camper vans Class B RVs Adventure vans Commercial vehicles Overland builds Specialty vehicles Heavier converted vans Because every build carries weight differently, suspension selection should be based on the completed vehicle rather than the chassis alone. Front and Rear Suspension Upgrades Increasing front ride height without addressing the rear can create an unbalanced vehicle. Depending on the application, WeldTec Designs can provide front and rear suspension components designed to work together to maintain proper stance and suspension performance. Rear suspension upgrades may improve: Load support Ride height Suspension travel Stability Vehicle balance Compatibility and Fitment Quigley and Advanced 4x4 conversions can vary depending on model year and configuration. Before ordering, confirm: Chevrolet Express model year 2500 or 3500 chassis Quigley or Advanced 4x4 conversion Current suspension height Existing front suspension components Rear suspension configuration Current tire size Desired tire size Vehicle weight Intended vehicle use Upgrade Your Existing Chevrolet Express 4x4 If your Chevrolet Express already has a Quigley 4x4 or Advanced 4x4 conversion but you want more lift, better ride quality, larger tires, or improved suspension control, WeldTec Designs offers upgrades designed to take the existing conversion to the next level. Browse the available Chevrolet Express 4x4 IFS suspension components above or contact WeldTec Designs with your vehicle year, chassis, 4x4 conversion manufacturer, current ride height, tire size, desired lift height, and vehicle use so we can help determine the correct setup.