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G-Series 4x4 Conversions
Parts
In this section, you will find a list of our available parts for GM 4x4 conversions. Please click the tabs above for more info and resources.
Info
The Chevrolet Express / GMC Savana platform is an excellent choice for 4x4 van conversions. The body on frame design is widely available and still produced today.
The setup is ideal for IFS suspension conversion which gives these vans comfortable drivability akin to a factory 2WD van.
They are inexpensive to work on, extremely durable, and parts are widely available. Timberline offers 2 lift variants of this conversion, a 1-2.5" suspension lift and a 6" lift option.
Unlike the Econoline, the G-Series van is offered in 2 wheelbases, 138" and 158". The long-wheelbase version can be a little more challenging to park. The G-series is not available with a high top from the factory. Cab and chassis models obviously open up box-truck type options.
Options
-We currently have conversion options for the 2003-2021 G2500, G3500, and G4500 series models. (We do not offer a 4x4 conversion for 1/2 ton models)
-Transmission options are limited to the 4L80, 6L90, and 8L90 variants. We have not attempted to convert the 4L60 to 4x4, found on some earlier 2500 models. All Timberline GM transmission options can be completed without the removal of the transmission from the vehicle.
-If completed properly, a standard lift option conversion should drive nearly identical to the van prior to conversion. 6" lift variants will drive very very well, however raising the center of gravity and installing 34" tires on anything will change the vehicle behavior to some degree. (Cool factor + clearance increases substantially more than ride quality degradation, if you want the lift, get the lift.)
Difficulty
-The GM IFS 4x4 torsion bar conversion is slightly more invasive than the Ford E-series, however, we have worked very hard to produce an easily repeatable, reliable 1-way solution that works every time.
-The GM IFS conversion requires cutting and some welding. It is meant to be completed in a shop and with both automotive and some light fabrication experience. Everything is very straightforward and basically only fits one way, so if you can follow simple instructions with clear photos, you'll be fine. A plasma cutter is not required, however, it does make some of the work go more quickly.
Resources
Please visit our "how do I convert my van to 4x4" page for a good overview of the options, process, and budgeting.
GM 4x4 Conversion Hi-Lift Knuckles
Timberline SupplyDescription: These are our GM Hi-Lift Knuckles for Chevy Express and GMC Savana full-size vans. These knuckles are several inches taller than the c...
View full detailsGM 4x4 Conversion Hi-Lift Carriages & Skid Plate System
Timberline SupplyDescription: This is our Hi-Lift drop carriage and skid plate system for GM 2500, 3500 & 4500 series vans, years 2003-current. This setup lower...
View full detailsGM HD Center link & tie rods for Hi-lift vans
Timberline SupplyDescription: This high-clearance GM van center link is a modified version of the original center link found in your van. It has been re-engineered ...
View full detailsGM 4x4 Van Hi-Lift Front Limit Strap Kit
Timberline SupplyDescription: Introducing our Front Limit Strap Kit for Hi-Lift 4x4 GM conversion vans. These limit straps are vital to protecting shocks and coilov...
View full detailsGM 4x4 Van Conversion Hi-Lift Sway Bar Link Kit
Timberline SupplyDescription: The Hi-Lift sway bar link kit integrates perfectly with our designs and geometry for the 5"-6" lifted GM vans. These over-size extende...
View full details8L90 Bolt-Up 4x4 Conversion Kit
Timberline SupplyDescription: This is the component kit required to convert a 2-wheel drive 8L90 transmission to 4x4. This conversion can be performed in-vehicle wi...
View full details8.25 IFS AAM Rebuilt Front Differential
Timberline SupplyDescription: Variations of the 8.25" front AAM carrier have been used in full size GMC vehicles since 1988. These are common in 1/2 ton Silverados...
View full details4L60 & 4L65 Manual Transfer Case Shifter Kit
Timberline SupplyDescription This is a universal bolt-up manual transfer case shifter for the 4L60/4L65 transmission found in GM trucks and vans from 1992-2013. The...
View full details6" Superbeef Anti-Wrap Ultra Heavy Duty Lift Block Kit
Timberline SupplyDescription: Lift block options for heavy rigs are just very limited when you start looking at 5" or more and we really wanted to provide a perman...
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