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Notice! Fulfillment staff will be off site 9/30-10/6. Orders will be processed the following week of 10/9/23. Please excuse any delays.
Notice! Fulfillment staff will be off site 9/30-10/6. Orders will be processed the following week of 10/9/23. Please excuse any delays.

Torsion Bar Carriage GM 4x4 van

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This torsion bar carriage and transmission/t-case cross-member is designed for use in 2500 + 3500 series Chevy Express and GMC Savana vans to both support the transmission and transfer case, as well as provide a home for torsion keys and locks. 

This bolt-up design drops right in place of the factory van cross-member holes and requires drilling a rear support hole through the frame of the vehicle for each rear support, as well as installation of a frame crush sleeve (welding recommended).

This system is designed for use with OEM-style torsion bars, keys, and lower control arms as well as our transmission adapter assembly and a factory truck trans mount. It will work for custom builds, but it is designed to integrate with the remainder of the Timberline lower carriage system for IFS GM 4x4 van conversions. 

NOTE: This carriage will interface with other popular brands of 4x4 conversions. We offer variants for the 6L90, the 8L90 and the 4L80, as well as a version with 1.5" additional drop for vans, lifted 4" or more. 

Fitment Designed for: 

Van Side - 2010-2022 Chevrolet Express 2500/3500/4500 series vans 4.8L, 6.0L, 6.6L). (4500 series vans and cab/chassis variants require additional fabrication work to box frame in, call for details)

Tools Required:

Standard hand tools minimum, pneumatic tools, and torque wrench recommended, welding highly recommended, larger drill bits and/or Unibit recommended, 


Torsion bar carriage, weld-in crush sleeves, hardware for carriage only. (Trans mount, torsion keys, etc, not included.)

Construction Notes:

1/4", 3/16" material CNC cut A36 mild steel, powder-coat

Tips / Skill Level:

1-10 (10 being most difficult) Level 4

This product may work with other model vehicles. 

Torque spec on replacement cross-member bolts (Originals not reusable) 52ft-lbs. rear through-frame bolts 110ft-lbs, transmission mount 25ft-lbs. 

Other Pertinent Part Numbers - K100011 or K100012 torsion keys, GK, GL, XG torsion bar codes, Anchor 2638 Transmission mount, RK621356, RK621355 control arms

Shipping, Fulfillment, Taxes, Quality, and Returns
  • Shipping: Our components are carefully wrapped and packaged and ship UPS, USPS, or FedEx, depending on what is available. If you require a particular carrier, please contact us ahead of your purchase.  Customers in Colorado may arrange for in-person pickup within 1-2 business days of purchase taking noted lead times into consideration. 
  • Shipping/Fulfillment time for components: We typically ship within 1-2 business days of your order and we carefully monitor our inventory. In the event that we are unable to meet that timeframe, we will contact you and arrange either a full refund or a timeframe for fulfillment agreeable to the customer. 
  • Taxes: Colorado residents must pay sales tax of 7.5%, no sales tax is collected on out-of-state shipments currently. 
  • Quality and Returns: We are consistently complimented on the quality of our products and the ease of install. Components are hand-built here almost exclusively in Colorado by seasoned professionals who are fanatics about design and execution. If you are in any way disappointed in the components we will issue a full refund less the cost of shipping when the product is returned. If you decide to return any components that didn't apply to your build or you changed your mind about, shipping and a 15% restocking fee will be deducted from the purchase refund.