G-Series 4x4 Conversions
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.
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.
-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.)
-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.
Please visit our "how do I convert my van to 4x4" page for a good overview of the options, process, and budgeting.
from $495.00| /
"No-Cut" 4x4 Conversion Adapters for 4L80 Transmission
Description: This is a simple bolt-up solution to convert your 4L80 transmission to 4x4 without cutting the output shaft of the transmission. Si...View full detailsfrom $495.00| /
from $380.00| /
GM Manual Transfer Case Shifter Kit
This is a simple bolt-up solution for a 4x4 transfer case shifter assembly that works with either the 4L80 or 6L90 transmissions found in most 2003...View full detailsfrom $380.00| /
from $1,875.00| /
6L90 Bolt-Up 4x4 Conversion Kit
Description: Often the most labor-intensive component of converting a van from 2WD to 4x4 is dealing with the transmission. 2010-2022 GM 2500/3500/...View full detailsfrom $1,875.00| /
NP261 Rebuilt Transfer Case
***Current lead time on transfer cases is 3 weeks from order to shipping. We intend to stock these in the near future. *** Description: The NP261 ...View full details$1,650.00| /
GM Vans 2500/3500 4x4 Torsion Bar Carriage + Crossmember
Description: This torsion bar carriage and transmission/t-case cross-member is designed for use in 2500 + 3500 series Chevy Express and GMC Savana ...View full details$885.00| /