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gM IFS Conversions

Our GM IFS 4x4 conversion system features a torsion bar front end, replicating the independent suspension found on GM light-duty trucks. Wear items are replaceable with OE and over-the-counter parts. Our design utilizes a reliable manual shift transfer case with a floor lever and automatic locking hubs for easy operation. This system provides reliable 4x4 capability while maintaining the smooth on-road and washboard performance of a GM pickup or Suburban that just can't be replicated in a solid axle truck.

General conversion work-flow:

Disassemble existing coil spring front end, lower control arms and crossmember.
Modify subframe to accept differential and truck control arm bracketry and install differential.
Install torsion bar carriage, bolt-up transmission adapters, shifting mechanism.
Lift rear of van where applicable, install wiring harness, transfer case, and peripherals like torsion bars, CV axles, steering, etc.
Finish remaining details, bump stops, wheels, align and go!

This is (of course) a simplified description of the process, but our templates, detailed manuals, and excellent customer support make this process a repeatable and reliable turnkey solution to building a 4x4 van the same way every time.

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Ford Solid Axle Conversions

Timberline's E-series conversion platform is based around a solid-axle coil sprung front suspension design. We spent 10 years designing and honing a solution to this difficult-to-perfect architecture incorporating the ride quality of coil springs with the durability of the late model Superduty solid axle.

Our design features 4"-6" lift options for most conversions, incorporating a 4-link control arm design with finely tuned track-bar, sway bar, and stabilizer systems that all work in tandem for an excellent mix of on-road behavior and off-road capability.

The front spring rate is maintained from the original van as well as all traction control systems and braking integration. Steering is all adopted from the F-series pickup so replacing wear-items is easy at all shops. The brake size is increased from the original van to improve stopping power and the steering radius is tighter than comparable leaf-sprung vans.

All kits and designs come with easy-to-follow instructions including full color support, torque specs, and tips we adopted from building hundreds of vans.

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