2014-2025 Cummins Extended Rear Track Bar Kit (CS-DATB-14-R-KIT)

Carli Suspension Part Number: CS-DATB-14-R-KIT

$1,346.40 CAD

Product

Extended Rear Track Bar

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Description

For use with 2014-2025 Cummins Carli lift kits. The Carli Extended Rear Track Bar addresses the single biggest shortcoming of the factory rear suspension: an insufficiently long track bar.

For Ram trucks, the factory 5-link rear suspension delivers an exceptional ride quality both on pavement and off-road, often compared to the comfort of a half-ton truck. However, this design isn't without flaws, most notably the insufficient length of the factory track bar. This specific shortcoming is the primary focus of the Carli Extended Rear Track Bar.

In the factory setup, the axle's movement is managed by four trailing arms, while a track bar controls its side-to-side (lateral) motion. A key issue arises from the opposing mounting points of the front and rear track bars, a design that forces the truck's chassis to twist over the axles as the suspension cycles. When the vehicle is in motion and the tires are fixed to the ground, this twist manifests as a side-to-side shift of the truck's body, a sensation known as yaw. Minimizing this yaw requires making the axle's path through its travel as linear as possible.

The physics of a track bar dictate two main ways to reduce this unwanted lateral movement. As the suspension compresses and extends, the track bar swings through an arc, causing its effective horizontal length to shorten. This change in length is what the driver feels as yaw. To minimize this effect, the track bar must be engineered to be as long and as flat (horizontal) as possible at the vehicle's standard ride height. A longer bar swings through a gentler, wider arc, resulting in less angle change and less effective shortening during the same amount of suspension travel.

Carli Suspension's engineering solution directly addresses these principles. It features a track bar that is an impressive 13.8 inches longer than the original factory bar. To achieve a perfectly flat angle at ride height, where the truck spends most of its time, the design incorporates a raised axle-side mount and a lowered frame-side mount. This geometry ensures that the axle's lateral shift is virtually eliminated during normal driving. The result is a rear end that feels completely stable, with no detectable yaw. Even at the extremes of suspension travel, the lateral shortening of the Carli track bar is a negligible 5/8 of an inch at most.

Another critical factor in suspension design is the roll center, the invisible pivot point around which the truck's body leans during a turn. A properly located roll center, aligned with the vehicle's center of mass, ensures stable and predictable handling. The geometry of the Carli track bar was meticulously engineered to optimize this roll center, preventing any feeling of imbalance or instability, especially when the truck is loaded.

In essence, the Carli Extended Rear Track Bar corrects the key geometric weaknesses of the factory 5-link suspension. By dramatically increasing the bar's length and optimizing its angle to be perfectly flat at ride height, it minimizes transverse axle movement and perfects the vehicle's roll center, resulting in a significantly more stable and controlled ride.

REQUIRED Add-Ons:

1" Bump Drop: CS-DRBD-AL
Extended Rear Sway Bar Links: CS-DEL-R-14
Rear Track Bar Hardware Kit: CS-DATB-14-R-PWHK

Note: Find optional add-ons in the additional information section below.

Part Number: CS-DATB-14-R-KIT

Features

Main Bar Construction

Made from 3/8" wall DOM (Drawn Over Mandrel) tubing.
Engineered to be significantly stronger than the brackets it bolts to.
The thick wall allows the bar end to be threaded directly, eliminating a weld-in bung which can be a potential point of failure.

Axle-End Heim Joint

Features a 1" x 7/8" FK Bearing Chromoly RSMX14T Heim Joint.
Utilizes a massive 1" shank for exponentially more shear strength than common 3/4" or 7/8" shanks.

Tapered Jam Nut System

A custom-developed tapered Jam Nut is used instead of a standard jam nut.
The nut and the end of the track bar have matching machined tapers (similar to a lug nut) to ensure the joint is perfectly centered.
This design provides 100% more friction surface area, leading to greater clamping force and a more reliable assembly.

Frame-End "CUB" Joint

Features a heavy-duty, gusseted housing for the joint.
Centered on a proven 7/8" PTFE-Lined FK Bearing Uniball.
The Uniball is encapsulated in custom-molded bushings.
The assembly is secured with a Stainless safety washer and a snap ring.
Custom misalignment spacers center the joint in the frame bracket, allowing for full fore and aft movement without binding or excessive bushing deflection.

From Carli Suspension

Rams equipped with the 5-link rear suspension offer an unparalleled on and off-road ride quality in both factory, and modified form. Straight off the dealer lot, the small bump compliance and composure of the factory suspension is reminiscent of driving a 1/2-ton. That said, this suspension design comes with it's share of downfalls. The one we're addressing with the Carli Extended Rear Track Bar is, as the name would imply, the length of the factory track bar.

The suspension is designed with 4 trailing arms maintaining the rear axle's vertical, fore, and aft movement while the lateral axle movement is controlled by a track bar. This track bar attaches to the frame on the passenger side and axle on the driver's side. This opposes the front track bar that's mounted to the frame on the driver's side and axle on the passenger's side. These opposing track bar mounting provisions cause the chassis to twist over the axles as the suspension cycles through it's travel. When the truck is suspended on a rack, springs removed – it's easy to see how the axle shift side to side as they travel through the shock stroke. In the real world, the tires are planted on the pavement (or dirt); their traction means the body shifts as the suspension cycles. This body movement (rotation of the vehicle around its vertical axis) is referred to as yaw. The more linear the axle's path through the travel stroke, the less "yaw" will be encountered.

There are two ways to mitigate the lateral movement of an axle with a track bar. First, lengthen the bar itself. The lateral movement that's felt, in cab, is the effective shortening of the track bar. The track bar will pivot around it's fixed mounting hardware. The frame bolt is static; the track bar is at it's longest when it's perfectly flat. It's shortest when at it's most extreme angle. The effective length and drastic angle change through travel is what's felt as in-cab yaw. Extending the length of bar itself, spacing the pivots further away from each other, will lessen the effective length AND angle change through the same stroke of travel.

With the bar as long as possible, flattening it at its center-point in travel (ride-height) will present the least deviation from it's longest to it's shortest effective length. Most miles are spent on the highway or around town; even light offroad. For this driving, the suspension will live in the middle 50% of it's travel. It's within this middle 50% that the side to side movement of the rear axle should be the least. To accomplish this, we designed the longest bar on the market – a whopping 13.8″ longer than the factory bar – then lifted the axle end and lowered the frame end to ensure the bar pivots were level at ride height. The result is a track bar that effectively disappears in the rear. There's no detectable rear yaw on a truck with the Carli Rear track bar. In analyzing the extremes of travel, you'll see the most deviation – given the amount of movement in the suspension when encountering obstacles large enough to reach these travel extremes, the lateral shift was still undetectable and, at it's most, the Carli track bar saw 5/8″ of shortening.

Last important metric – "Roll Center". This concept is not easily understood; luckily, there is a ton of