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1/30/24 - Site under construction. If you need a build sheet on a specific van, email us. Ford Mini Kits are back in stock, lowered price. We also updated the Ford Gen 4 Ford kit and will be adding Gen 3 info next day or so.
1/30/24 - Site under construction. If you need a build sheet on a specific van, email us. Ford Mini Kits are back in stock, lowered price. We also updated the Ford Gen 4 Ford kit and will be adding Gen 3 info next day or so.
Timberline 4x4 GM Van

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. 

 

  • from $299.95

    Superbeef Roof Rack Bracket System GM+Ford

    Description: The Timberline Superbeef roof rack bracket system is the perfect solution for mounting your custom-built roof rack on your full-size ...

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    from $299.95
  • from $4,302.00

    GM Van 4x4 Core Conversion Kit Standard Lift

    Description: This is the Timberline core components kit required to convert your 2500 or 3500 series GM van to 4-wheel-drive. We have worked dilige...

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    from $4,302.00
  • GM 8.25 Front Diff Mount Kit 6.6 Diesel
    from $845.00

    GM Van 4x4 IFS Front Differential Mounting System - Standard Lift

    Description: This kit includes the basic components, templates, and bracketry required to hang a 4x4 IFS GM front differential from your 2003-2023 ...

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    from $845.00
  • Modified GM Van Center Link
    $325.00

    Hi Clearance GM Center Link ($125 core)

    Description: This high-clearance GM van center link is specially designed to address clearance issues with the steering linkage in 4x4 conversions,...

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    $325.00
  • from $250.00

    4L80 Manual Transfer Case Shifter Kit

    Description This is a bolt-up manual transfer case shifter for the 4L80 transmission found in many GM pickups and vans. Our shifter is designed to...

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    from $250.00
  • from $199.00

    6L90 Manual Transfer Case Shifter Kit

    Description 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...

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    from $199.00
  • from $139.00

    GM G-series 4x4 Conversion Rear Lift Kit

    Description: Our GM G-series rear lift kit is a solid solution for lifting the rear of your GM van. This kit is compatible with 2003-current 1500/...

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    from $139.00
  • 4x4 Timberline 6L90 Kit
    from $1,795.00

    6L90 Bolt-up 4x4 Conversion Kit (no-cut)

    Description: This is a straightforward bolt-up solution for converting your 6L90 transmission to 4x4, without the need to cut the output shaft. To ...

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    from $1,795.00
  • from $249.00

    Easy-wire GM 4x4 hub lock + Indicator Kit

    Description: The Easy-wire GM 4x4 hub lock + indicator kit is a stand-alone wiring system designed to activate the front hub lock motor and LED ind...

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    from $249.00
  • GM Van Timberline 4x4 Sway Bar Link Kit
    $110.00

    GM 4x4 van Sway Bar Kit

    Description: Our GM 4x4 van sway bar kit simplifies the process of repositioning your sway bar and links when converting your van to 4x4. Switching...

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    $110.00
  • Eyelet to bar shock adapters
    from $79.00

    Shock Adapter Eyelet to Bar Style

    Description: This Eyelet-to-bar style adapter bracket can be used to retain your original van front shocks during your 4x4 conversion or our recomm...

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    from $79.00
  • $55.00

    Hub Spacer Kit 2WD to 4x4 Adapter Rings

    Description: Our CNC-cut powder-coated hub spacer is a key component of GM 4x4 van conversions where the original van knuckles are retained. These ...

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    $55.00
  • from $115.00

    GM 4x4 Van Bump Stop Kit

    Description: The GM 4x4 van bump stop kit is crucial for optimizing GM IFS system performance in your 4x4 van conversion. We offer three options: 0...

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    from $115.00
  • $75.00

    Timberline Helper Kit

    Description: Are you building a 4x4 van? Let us help you with the consumables. Drawing on our experience of hundreds of 4x4 conversions, these are ...

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    $75.00
  • Torsion Bar Carriage 4x4 GM Van
    from $885.00

    GM 4x4 Van Torsion Bar Carriage System

    Description: This torsion bar carriage and transmission/t-case cross-member is designed for use in 2500 + 3500 series Chevy Express and GMC Savana ...

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    from $885.00
  • Easy Wire Ford 4x4 Range Kit 271 Transfer Case
    from $99.00

    Easy-Wire Transfer Case Range LED Indicator Kit

    Description: 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...

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    from $99.00
  • from $14,195.00

    GM 4x4 5" Turn-key Hi-Lift Torsion Bar Conversion Kit

    Description: This is our turn-key 4x4 conversion kit for 2003-2023 G-series 2500/3500 vans. The design is an IFS (Independent Front Suspension) ...

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    from $14,195.00
  • from $1,695.00

    9.25 IFS AAM Rebuilt Front Differential

    Description: The AAM 9.25 IFS axle was used in GM K-series trucks from 1988-2010. It features a lightweight cast aluminum housing and has 33 splin...

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    from $1,695.00
  • $1,650.00

    NP261 Rebuilt Transfer Case for 4x4 Van Conversions

    Description: The NP261 was built by New Process (New Venture) and is a reliable chain-driven transfer case used primarily in Chevrolet and GMC veh...

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    $1,650.00
  • $1,095.00

    GM G-series Adjustable Upper Control Arms

    Description: These are adjustable upper control arms for the Chevy Express and GMC Savana Van 2500/3500/4500 series vans from 2003-current. Our con...

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    $1,095.00
  • from $2,095.00

    GM 4x4 Conversion Over The Counter Essentials Kit

    Description: This kit comprises the over-the-counter components necessary to complete our standard and Hi-Lift 4x4 torsion bar conversions on mos...

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    from $2,095.00
  • from $485.00

    GM Full Size 4x4 Conversion Custom Rear Driveshaft

    Description: We offer custom-built 1-piece driveshafts for 4x4 van conversions completed using our products. There is a good bit of variability in...

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    from $485.00
  • $395.00

    GM Full Size 4x4 Conversion Custom Front Driveshaft

    Description: We offer custom-built driveshafts for 4x4 van conversions completed using our products. There is a bit of variability in the lengths ...

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    $395.00
  • Timberline Hi Lift Chevy Van Knuckles
    $1,195.00

    GM 4x4 Conversion Hi-Lift Knuckles

    Description: 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...

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    $1,195.00