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.
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- Part Type (5)
- Transmission_4L80 (5)
- Transmission_4R70/75 (4)
- Transmission_5R110 (4)
- Transmission_6L90 (5)
- Transmission_6R140 (4)
- Transmission_8L90 (2)
- Transmission_E40D/4R100 (4)
- Vehicle Make_GMC/Chevrolet (5)
- Vehicle Model_E-150 (4)
- Vehicle Model_E-250 (4)
- Vehicle Model_E-350 (4)
- Vehicle Model_E-450 (5)
- Vehicle Model_G3500 (5)
- Vehicle Model_G-2500 (5)
- Vehicle Model_G-4500 (5)
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Superbeef Roof Rack Bracket System GM+Ford
Timberline SupplyDescription: The Timberline Superbeef roof rack bracket system is the perfect solution for mounting your custom-built roof rack on your full-size ...
View full details6L90 Manual Transfer Case Shifter Kit
Timberline SupplyDescription This is a bolt-up manual transfer case shifter for the 6L80 transmission found in many GM pickups and vans. Our shifter is designed to...
View full detailsTimberline Helper Kit
Timberline SupplyDescription: Are you building a 4x4 van? Let us help you with the consumables. Drawing on our experience of hundreds of 4x4 conversions, these are ...
View full detailsEasy-Wire Transfer Case Range LED Indicator Kit
Timberline SupplyDescription: Take the head-scratching out of wiring up the indicator for your transfer case. This is our Easy-Wire kit that cuts way down on time t...
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...
View full details