BMR RSK639H Rear Suspension Kit 15in Conversion Black Hammertone Cadillac CTS-V

Vehicle Fitment

• 2016-2019 Cadillac CTS-V 3rd Gen (6.2L LT4 Supercharged V8, 640 HP - RWD)

Fitment Notes

• Fits the 2016-2019 Cadillac CTS-V 3rd Generation (V3) - the only trim level offered on the 3rd-gen CTS-V; all 2016-2019 CTS-Vs are covered
• This rear suspension kit is the suspension geometry component of BMR's 15-inch wheel conversion system for the 3rd-gen CTS-V - it is designed to be paired with a compatible BMR brake kit (DBK350 or DBK353) to achieve the clearance needed for 15-inch drag wheel fitment; the brake kit is sold separately and is required to complete the 15-inch conversion
• The RSK639H can also be used as a standalone rear suspension performance upgrade independent of the 15-inch conversion - it significantly improves traction, launch consistency, and rear suspension geometry on any 3rd-gen CTS-V regardless of wheel and brake configuration
• 100% bolt-in installation - no cutting, welding, or permanent chassis modification required
• All adjustable rod end components allow on-car length adjustment without removal - adjustments are made with a wrench while parts remain installed on the vehicle
• A rear wheel alignment is required after installation to correctly set toe with the new TR630 toe rods
• Designed for street performance and drag racing applications

Features

• Comprehensive rear suspension kit addressing all four major rear suspension link positions on the 3rd-gen CTS-V's independent rear suspension simultaneously - upper control arms, lower trailing arms, upper trailing arms, and toe rods - improving the entire rear suspension as a matched, geometry-corrected system
• Manufactured from 1.25-inch DOM steel tubing throughout - dramatically stiffer and stronger than the factory stamped steel control arms and trailing arms, which flex and deflect under the extreme torque loads generated by the CTS-V's 640HP supercharged LT4 V8
• Zinc-plated, heat-treated, chrome-moly, self-lubricating, Teflon-lined rod ends at all link attachment points - replacing factory rubber bushings with zero-compliance, bearing-quality pivots that allow full suspension articulation without any lateral deflection or bushing compliance
• Adjustable components with left- and right-hand thread rod ends allow on-car geometry correction at any ride height - essential for re-centering and optimizing the rear suspension on a CTS-V that has been lowered or modified from stock
• Dramatically improves traction and launch consistency on the 3rd-gen CTS-V - a platform particularly susceptible to rear suspension compliance issues under the extreme launch loads of 640HP all going through the rear tires
• Eliminates rear suspension compliance and flex-induced geometry changes under hard acceleration - keeping the rear suspension in its intended geometric position throughout the power stroke rather than allowing it to shift under load
• Lightweight DOM tubular construction is significantly lighter than the factory stamped steel and rubber bushing assemblies being replaced
• Improves handling and cornering capabilities in addition to straight-line drag racing performance - the geometry corrections and deflection elimination benefit all forms of performance driving
• Black hammertone powdercoat finish on all components provides durable, long-lasting corrosion resistance
• Proudly designed and manufactured in the USA by BMR Suspension

Specifications

• Part Number: RSK639H
• Finish: Black hammertone powdercoat (all components)
• Tubing: 1.25-inch DOM steel (all tubular components)
• Rod Ends: Zinc-plated, heat-treated, chrome-moly, self-lubricating, Teflon-lined (all pivot points)
• Installation Type: 100% bolt-in (no cutting, welding, or modification)
• Alignment Required: Yes (rear toe) - after TR630 toe rod installation
• Country of Origin: USA (designed and manufactured)
• Warranty: 2 years (BMR standard)

Included Components

• TR630 - Adjustable Rear Toe Rods (pair): 1.25-inch DOM steel; TIG-welded chrome-moly tube adapters; zinc-plated heat-treated chrome-moly Teflon-lined rod ends; left- and right-hand thread for on-car adjustment; eliminates factory eccentric bolt toe adjustment and reduces toe rod flex under load
• LTA631 - Rear Lower Trailing Arms (pair): 1.25-inch DOM steel; zinc-plated Teflon-lined rod ends; adjustable; dramatically reduces lower trailing arm flex and eliminates bushing deflection
• UCA631 - Rear Upper Control Arms (pair): 1.25-inch DOM steel tubing with CNC laser-cut/formed 3/16-inch steel plate open end; zinc-plated X-series heat-treated chrome-moly Teflon-lined rod ends; adjustable; eliminates upper control arm flex and bushing deflection
• UTA631 - Rear Upper Trailing Arms (pair): 1.25-inch DOM steel; zinc-plated Teflon-lined rod ends; adjustable; dramatically reduces upper trailing arm flex and eliminates bushing deflection
• All associated mounting hardware (Grade 8)

Product Description

The BMR Suspension RSK639H is a comprehensive rear suspension kit engineered for the 2016-2019 Cadillac CTS-V 3rd Generation that addresses all four major rear suspension link positions - rear upper control arms, lower trailing arms, upper trailing arms, and toe rods - as a complete, matched system. It serves as the suspension geometry component of BMR's 15-inch drag wheel conversion system for the 3rd-gen CTS-V, designed to be paired with a compatible BMR brake kit (DBK350 or DBK353) to achieve the brake and wheel clearance needed for 15-inch drag wheel fitment. It is also equally effective as a standalone rear suspension performance upgrade on any CTS-V build that does not require a wheel conversion.

The 3rd-gen CTS-V's 640HP supercharged LT4 V8 places enormous torsional and lateral loads on the rear suspension during hard launches - loads that expose every compliance point in the factory stamped steel and rubber-bushed rear suspension as a traction loss mechanism. The factory upper control arms, trailing arms, and toe rods flex and allow their rubber bushings to deflect under these loads, causing dynamic rear suspension geometry changes mid-launch that produce wheelhop, traction loss, and inconsistent 60-foot times. The RSK639H eliminates all of this by replacing all four link types with 1.25-inch DOM steel tubular arms equipped with zinc-plated, heat-treated, chrome-moly, Teflon-lined rod ends at all pivot points. The result is a zero-compliance rear suspension where all four link positions are rigid, adjustable, and geometrically stable under any load condition. All components include adjustable rod ends with left- and right-hand thread construction, enabling on-car geometry and toe correction without removal. Made in the USA by BMR Suspension and backed by a 2-year limited warranty. A rear wheel alignment is required after installation.