What happens to your turning diameter once Quigley install your Independent Front Suspension (IFS) 4×4 system? Nothing, your turning diameter remains the same as the 2-wheel drive OEM GM vans.
The diagram below shows you how a turning diameter is calculated and corresponding table shows you the comparison between our 4×4 IFS system and GM’s OEM 2-wheel drive. The left turning diameter and the right turning diameter are not always the same; therefore you must calculate it as an average of the 2 turns.
GM Turning Diameter Specs
| Models | Wheelbase | Turning Diameter (ft.) | |
| Quigley 4×4 Curb-to-Curb | GM Curb-to-Curb | ||
| G-2500 | 135″ | 49.2 ft. | 49.2 ft. |
| G-2500 | 155″ | 54.5 ft. | 54.5 ft. |
| G-3500 | 135″ | 49.2 ft. | 49.2 ft. |
| G-3500 | 155″ | 54.5 ft. | 54.5 ft. |
