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We are currently working on the site and uploading / updating parts offerings. Products will appear as "sold-out" until we update descriptions in full. Please contact us with any questions or issues by email. Thanks! 7/23/22
We are currently working on the site and uploading / updating parts offerings. Products will appear as "sold-out" until we update descriptions in full. Please contact us with any questions or issues by email. Thanks! 7/24/22
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. 

 

  • $95.00

    GM Sway Bar + Links Relocate Kit

    Description: The mounting surfaces for the sway bar links differ from vans to trucks on the lower control arms which are changed during the 4x4 con...

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    $95.00
  • $480.00

    GM 4x4 IFS Conversion Wiring Kit

    Description: The IFS 8.25 and 9.25 AAM front differential used in 1/2 ton and 3/4 ton GM pickups utilize an electronic actuator to engage the front...

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    $480.00
  • $1,185.00

    Differential Mounting System for IFS 4x4 GM Van Conversion

    Description: ***See fitment notes below for additional constraints. This kit most comfortably fits gas 4.8 and 6.0 vans, though it will fit other d...

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    $1,185.00
  • $88.00

    GM Van 4x4 Hub Adapter Rings

    Description: Silverado knuckles and Chevy Express knuckles are similar but they do not directly interchange. The K series knuckle is too short for ...

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    $88.00
  • $1,650.00

    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 ...

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    $1,650.00
  • $1,595.00

    9.25 IFS AAM Rebuilt Front Differential

    ***Current lead time on front differentials is 3 weeks from order to shipping. We intend to stock these in the near future. *** Description: The AA...

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    $1,595.00
  • $2,116.85

    GM Standard 4x4 Conversion Over-The-Counter Kit 4.8 / 6.0

    ***Current lead time on this component kit is 7-10 days from order-to-ship*** Description: This kit comprises the over-the-counter components nece...

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    $2,116.85
  • Sold out
    $0.00

    GM Rear Lift Leaf Springs

    This is currently a placeholder for a product being added.

    $0.00
    Sold out
  • $485.00

    GM 4x4 Conversion Rear Driveshaft

    ***Driveshafts are currently built when ordered and ship in 7-10 days. *** Description: We offer driveshafts for 4x4 van conversions completed usi...

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    $485.00
  • $395.00

    GM 4x4 Conversion Front Driveshaft

    ***Driveshafts are currently built when ordered and ship in 7-10 days. *** Description: We offer driveshafts for 4x4 van conversions completed usi...

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    $395.00
  • Sold out
    $0.00

    GM Lower Coilover Mount Kit

    This is currently a placeholder for a product being added.

    $0.00
    Sold out
  • Sold out
    $0.00

    Hi Clearance GM Centerlink

    This is currently a placeholder for a product being added.

    $0.00
    Sold out
  • Sold out
    $0.00

    GM 5" Lift Front Carriages + Skid Plate Kit

    This is currently a placeholder for a product being added.

    $0.00
    Sold out
  • Sold out
    from $135.00

    GM Van 2" Rear Lift Kit

    Description: Our GM 2" Rear lift kit is a very basic solution to lifting the rear of your van. Compatible with 2003-current 1500/2500/3500 vans, th...

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    from $135.00
    Sold out
  • $4,450.00

    Basic 4x4 Conversion Kit Chevrolet Express / GMC Savana (2003-2021)

    Description: This is our standard conversion kit containing the non "over-the-counter" components required to do an IFS 4x4 torsion bar conversion ...

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    $4,450.00
  • 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...

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    from $495.00
  • from $88.00

    Eyelet to Bar Style Shock Style Adapter

    Description: There are quite a few options for shock adapters, but limited or no options for converting an eye-style shock mount to a bar-style. Wh...

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    from $88.00
  • $380.00

    GM 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...

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    $380.00
  • from $115.00

    GM Bump Stop Relocation Kit

    Description: Our torsion bar 4x4 setup uses 1999-2010 GM lower control arms which interface with similar truck torsion bars. The striking pad profi...

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    from $115.00