1963-1987 Chevy K10 & K20 Pro-Extreme 4×4 Chassis with 1 Ton Axles – New!

We are proud to offer our new 1963-1987 Chevy K10 and K20 Truck Pro-Extreme 4×4 Chassis with Currie Extreme 1 Ton Axles.

The Currie Extreme 60 1-Ton front and rear axle assemblies are designed for severe off-road use. The reinforced Extreme 60 center castings feature thick walls and heavy webbing, providing ultimate gear strength and durability. The front axle incorporates complete 1-Ton inner and outer steering assemblies, and the rear implements 40-spline axles and billet full-floating hubs to deliver ultimate reliability. If you seek out the most challenging routes and most formidable obstacles to conquer, the Extreme 60 axles are a natural choice.

Putting 50 years of design and engineering expertise to work, we begin with 10 laser cut frame pieces of U.S. derived.134w steel. The frame rails are unique from anything we have previously built. Knowing that the transfer case would inhabit the same space as our traditional center section we came up with a new way to increase strength. What we ended up with was an internal honeycomb insert that helps increase torsional rigidity. Essentially, there is a multi piece grid pattern reinforcement structure that is placed inside the frame rails before they are boxed. Each piece of the frame rail is fixture welded with the outside edges being ground smooth. The frame rails are then placed into a chassis fixture where we add front and rear crossmembers and completely new design center section to work around the driver-side output transfer case. Compared to the factory frame rail profile, our engineers widened the rails ahead of the cab and narrowed them behind the cab. This allows more room for headers and steering components, up front. While outback, this allowed us to mount the shocks outside the frame rails which maximizes roll stiffness and still have plenty of room for 37″x12″ tires. The center section and driveshaft loop is comprised of 4 pieces of 1”x2”.120w rectangle tubing & 4 large.1875″ gusset plates adding even more rigidity. Center section design allows for 3” round tube exhaust to fit with room to spare. The chassis is built around late model LS/LT engine/trans platforms using a driver-side output Atlas Transfer Case.

This is the most well thought out & executed 1963-1987 K10 and K20 4×4 Chassis available today.

We relied on the experts at RockJock to provide not only the most durable but also readily available replacement steering components. The included Borgeson steering box is a direct replacement for 1966-1977 Broncos. RockJock High Steer Forged knuckles, Forged Outer Tie Rods, and unit-bearing hubs are based on the 8×6.5″ Bolt Pattern. Crucial steering angles and tie rod lengths were carefully engineered to minimize bump steer and lateral movement. Common 8×6.5 bolt pattern hubs offer many popular wheel choices. Up to 37” tall tires fit while maintaining full turning radius, travel and articulation.

Working closely with Currie Enterprises & RockJock our engineers have designed front and rear 4-Link suspensions that are not only strong but multi-functional. Maximized length link bars provide minimal wheelbase change throughout travel and have the added benefit of limiting roll steer. Coil-over angle has been kept close to vertical to keep motion ratio close to 1:1 while keeping the mounts as wide as possible for maximum roll control. That means this new chassis will be just as capable off road as it is on road. With the Fox adjustable coil-overs your ride comfort can be tailored to your exact driving style. Whether you’re cruising down the highway, flying across the desert or crawling up the mountainside we have you covered.

Front and Rear 4-links with uneven length 2”x.250w tubing link bars utilizing 1.25” shank RockJock Johnny Joints. Front wheel travel = 12″ Rear wheel travel = 12″ Fully adjustable Fox 2.5”x12” Performance Series remote reservoir coil-overs mounted directly to the axle at all 4 corners. Fox 2.0” Race Series bump stops allow additional tuning capabilities and provide safety when bottoming. RockJock Antirock adjustable anti-sway bars front and rear.

Borgeson supplied 1966-1977 Bronco steering box. RockJock supplied High Steer Forged knuckles & outer Tie Rods provide strength and excellent turning radius. Custom Panhard bar with maximized length to control lateral movement. Fox supplied steering stabilizer provides proper off-road steering control.

All TCI Engineering products come with our Dual Warranty. 6 Year, 60,000 Mile Warranty on wear and tear items like bushings, tie rods, & ball joints. Any items built in house by TCI Engineering such as link bars, control arms, spindles, crossmembers, etc come with a Lifetime Warranty.

We pride ourselves in partnering with our customers to build their ride, the best way, the first time. Let us help you, too.

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Checkout the 1970 K10 4×4 built by JPS Customs

Platform-level fitment (Ford + GM, Phase 1). We publish the engine platform a part is built for — not year-and-trim application data — so nothing here confirms a fit on a specific vehicle. Confirm fitment with us before ordering: (714) 202-7886.