Over several months–and with the help of FOX–we spent many hours testing, measuring, cycling, timing and tuning the suspension to optimize the existing design of these Quigley and QuadVan 4×4 conversions. Our “Ride Improvement Package” AKA “RIP” — custom tuned and valved FOX 2.0 Performance Series IFP Shocks, FOX Performance Series ATS Stabilizer and matched coil springs — once installed, doubles the bump travel, increases the overall travel, increases the spring height and spring rate, eliminates binding of the sway bar, provides rear suspension ride stability and controls body roll and sway.After hearing repeated complaints from owners about the harsh ride and handling of their Ford E-series Quigley and QuadVan 4×4 conversions, we tested a few of them and confirmed a serious need for improvement. Having more than 20 years of experience in off-road racing and suspension tuning, we immediately knew that major improvements could be made with minimal expense and modification.

Both the Quigley and QuadVan 4×4 conversions are very sound designs with proven functionality and reliability, but drive them over speed bumps, pot holes, or off-road, and you may begin to doubt your purchase decision. Here’s the problem: their front suspension suffers from limited bump travel primarily due to the front frame cross member interfering with the front axle differential housing at full bump. In both designs, cross members are modified to provide maximum clearance, but the unintended result of this modification is an underwhelming 1.5 inches (or less) of bump travel before the front suspension “bottoms out.” Any impact is directly transferred to the van and its unfortunate occupants.

These vans are designed and built for off-road performance and handling, but in reality, these vans spend most of their lives on the pavement…and it is on the pavement where their performance suffers most. Complaints primarily relate to on-road handling concerns of excessive body roll, “swim,” and back-and-forth wallow while simply entering driveways or crossing irregular surfaces.