Zone Offroad ZONC2650 6.5"/4.5" Cast Steel Arms for 2014-2018 Chevy/GMC 1500 4WD

Vehicle Fitment

• 2014-2018 Chevrolet Silverado 1500 (All Trims, 4WD, with Factory Cast Steel Control Arms)
• 2014-2018 GMC Sierra 1500 (All Trims, 4WD, with Factory Cast Steel Control Arms)

Fitment Notes

• Designed exclusively for trucks equipped with factory cast steel upper and lower control arms. Verify arm type before ordering - GM produced cast steel, stamped steel, and aluminum control arm configurations on 2014-2018 model year trucks. Stamped steel and aluminum arm trucks require the separate aluminum control arm kit.
• Does NOT fit 2WD models.
• Does NOT fit models equipped with MagneRide (magnetic ride control) suspension.
• Factory 17" and 18" wheels cannot be reinstalled after installation due to tie rod end interference.
• 4WD models may require front CV driveshaft modification. See installation instructions for full details.
• Frame bracket modification and minor welding required during installation.
• This part number (ZONC2650) is a component box - it is included as part of the full Zone Offroad C25N 6.5"/4.5" cast steel lift kit system and is also sold separately as a replacement or standalone component.

Features

• Ductile iron, CNC-machined replacement steering knuckles maintain OE steering geometry and ball joint angles, while allowing continued use of 17" wheels after install.
• Heavy-duty, fully boxed one-piece crossmembers constructed from 1/4" high-strength steel correct lower control arm geometry and provide a clean underhood appearance.
• Multi-point differential relocation system corrects front pinion angle and CV operating angles for proper driveline geometry at lifted ride height.
• Center differential brace ties front and rear crossmembers together, creating a rigid and secure differential mounting platform.
• Differential skid plate and support strut are included for added underbody protection during off-road use.
• Weld-in control arm pocket plate included for additional frame reinforcement and long-term structural integrity.
• Rear lift accomplished via solid cast iron blocks - stronger and more precise than fabricated alternatives.
• FMVSS No. 126 (ESC system test) compliant - works with GM's factory StabiliTrak electronic stability control system without triggering warning lights.
• Bolt-on strut spacers retain factory strut assembly - no need to disassemble the OE strut for installation.
• Made in the USA - over 98% domestic content; backed by Zone Offroad's limited lifetime warranty.

Specifications

• Front Lift Height: 6.5 inches (via bolt-on strut spacers)
• Rear Lift Height: 5 inches (via solid cast iron block kit)
• Rear Lift Method: Block and extended U-bolt kit
• Crossmember Material: 1/4" high-strength steel, fully boxed
• Steering Knuckle Material: Ductile iron, CNC-machined
• Rear Block Material: Solid cast iron
• Maximum Tire Size: 35x12.50
• Recommended Wheel - 17x9 with 5.0" backspacing
• Recommended Wheel - 18x9 with 5.0"-5.25" backspacing
• Recommended Wheel - 20x9 with 5.75" backspacing (use 1/4" spacer for factory 20" wheels)
• Estimated Install Time: 8 hours
• Difficulty Level: 4 out of 5
• FMVSS No. 126 (ESC) Compliant: Yes
• Warranty: Limited Lifetime (Zone Offroad Shield Warranty)
• Position: Front and Rear Suspension
• Drivetrain: 4WD only

Included Components

• 2x Fully boxed heavy-duty crossmembers (1/4" high-strength steel)
• 2x Ductile iron CNC-machined replacement steering knuckles
• 1x 3-piece differential relocation bracket system
• 1x Center differential brace
• 1x Differential skid plate
• 1x Differential support strut
• 1x Weld-in control arm pocket plate
• 2x Bolt-on strut spacers (front lift)
• 2x CV spacers
• 2x Brake line relocation brackets
• 1x Sway bar relocation hardware
• 2x Solid cast iron rear lift blocks (5")
• 4x Extended rear U-bolts
• 1x Complete hardware kit (all necessary nuts, bolts, and fasteners)

Product Description

The Zone Offroad ZONC2650 is the cast steel control arm component box for the full C25N 6.5"/4.5" Spacer Lift System, engineered specifically for 2014-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks equipped with factory cast steel upper and lower control arms. This component box includes the critical front-end hardware - replacement ductile iron CNC-machined steering knuckles, fully boxed 1/4" steel crossmembers, a multi-point differential relocation system, and supporting front lift hardware - that delivers 6.5 inches of front lift and 5 inches of rear lift while correcting suspension, steering, and driveline geometry. Unlike generic spacer-only solutions, this system rebuilds the front subframe geometry from the ground up, maintaining proper operating angles throughout the full range of suspension travel.

Zone's engineers designed this kit specifically around the updated electronic power steering, revised knuckle geometry, and new control arm architecture introduced on the 2014-2018 GM K1500 platform. The FMVSS No. 126-compliant design works transparently with GM's StabiliTrak stability control system, so no warning lights, no required module resets, and no compromises to factory safety systems. The cast iron rear block kit - paired with extended U-bolts - levels the stance to match the aggressive front lift and provides the support needed to handle larger tire loads without sagging. For crew cab models, an optional add-a-leaf kit (Zone Part #C6159) is recommended for additional rear load capacity and a more level appearance.

This kit is appropriate for serious off-road builds and daily-driven trucks looking for maximum ground clearance on the 2014-2018 GM 1500 platform. Proper fitment requires verifying that the truck's factory upper control arms are cast steel - not stamped steel or aluminum - before ordering, as GM produced multiple configurations during this model range. Installation requires minor welding for the frame pocket plate and driveline modifications on 4WD models; professional installation is recommended. With Zone's limited lifetime warranty and all-USA construction, the ZONC2650 component box represents a proven, durable foundation for any serious lift build on these trucks.