Town, Trail, or Track: Which Core 4x4 Control Arm Series Is Right for Your Build?

Every build is different. Core 4x4 offers three control arm series — Town, Trail, and Track — each tuned for a specific type of driving. Here’s how to pick the one that fits your truck.

Why Aftermarket Control Arms Matter

If you drive a Dodge Ram 1500 — or any truck with a solid rear axle — your factory control arms are holding the axle in position and controlling how it moves under load. The problem is that the OEM arms use soft rubber bushings that flex, compress, and eventually wear out. That flex is the root cause of the notorious wheel hop: under hard acceleration, the rubber bushings create a preload on the arm that lets the axle wind up and release in rapid cycles, hammering the driveline and shredding traction.

Every control arm Core 4x4 sells — across all three series — eliminates wheel hop by replacing those rubber bushings with engineered polyurethane or RockJock Johnny Joint ends. The difference between the series comes down to which end type is used and how much articulation the joint allows.

Fixed vs. Adjustable: Which Do You Need?

Before choosing a series, you need to decide between fixed-length and adjustable control arms. The answer depends on whether your suspension has been modified.

Go fixed if your truck is at stock height or if your lift/lowering kit includes relocation brackets that keep the factory geometry correct. Fixed arms are simpler, lighter, and less expensive. Core 4x4 fixed arms work within a ±2-inch range from stock height without affecting driveline angles.

Go adjustable if you have lifted or lowered your truck and your rear pinion angle is off — you will know because you will feel driveline vibrations at highway speed. Adjustable arms let you dial in the upper arm length to correct the pinion angle and get the rear driveshaft running true. An adjustable panhard bar handles left-to-right centering.

The key diagnostic: your rear differential’s pinion angle should be as close to parallel with the transfer case output shaft as possible. As you change ride height, the shorter upper arms shift the pinion angle faster than the lowers, so the upper adjustable is the most critical if you can only do one.

The Three Series Explained

Town Series — Daily Driving and Commuting

The Town Series uses high-quality polyurethane bushings at both ends. Poly bushings are a significant upgrade over factory rubber — they are stiffer, more durable, and resist compression set. They eliminate wheel hop while still providing a smooth, quiet ride that works well for daily commuting, grocery runs, and regular highway driving.

Best for: Daily drivers, commuters, trucks that spend most of their time on pavement. If your truck is a work vehicle that sees the highway every day and maybe a gravel road on the weekend, Town Series arms deliver the upgrade you need without over-building for use cases you will never hit.

Trail Series — The All-Arounder

The Trail Series uses a polyurethane bushing at one end and a RockJock Johnny Joint at the other. The Johnny Joint is a tight-tolerance, rebuildable, greaseable spherical joint that allows significantly more articulation than a poly bushing while still handling high loads. That hybrid design gives you the street-friendly stiffness of poly on one side and the off-road flexibility of a spherical joint on the other.

Best for: Trucks that do everything — daily driving, towing, hauling, weekend trail rides, camping trips. If you tow a trailer, haul heavy loads in the bed, or hit fire roads and moderate trails regularly, the Trail Series is Core 4x4’s most versatile option. The Johnny Joint lets the suspension cycle more freely over uneven terrain, which improves ride quality and traction off-road without sacrificing on-road manners.

Track Series — Maximum Performance

The Track Series uses RockJock Johnny Joints at both ends. Double Johnny Joints give the suspension maximum freedom to articulate and cycle under extreme loads. The joints are tight but flexible, which means the arm controls the axle precisely while allowing it to move through its full range without binding or creating parasitic loads on the bushings.

Best for: Heavy towing, heavy hauling, added-power builds (supercharged, turbocharged), track use, and serious off-road applications. If your Ram 1500 has a Whipple, ProCharger, or turbo kit pushing significantly more power through the driveline, the Track Series is the right choice. The double Johnny Joints handle the increased torque loads and let the suspension do its job without the bushings becoming the weak link.

Side-by-Side Comparison

Installation Overview

Swapping control arms on a Ram 1500 is a bolt-on job — no cutting, welding, or drilling required. The process is the same regardless of which series you choose:

1. Support the truck. For fixed-length arms, the easiest method is to work on the ground under the truck’s own weight. Do one arm at a time so the axle stays located. If you are changing arm length (adjustable arms on a lifted truck), use a lift so the axle can hang and be repositioned.
2. Remove the factory arm. One bolt at each end. The factory rubber bushings may resist — penetrating oil and patience are your friends.
3. Install the new arm. Slide the new arm into position and install the hardware. Core 4x4 hardware torques to 160 ft-lbs. Factory hardware spec is 150 ft-lbs.
4. Repeat for all four arms (upper and lower, both sides).
5. Install the panhard bar if included. This is easiest on the ground. Torque spec: 140 ft-lbs.

Pro tip from the Core 4x4 shop: If you are working on a lift and the axle shifts when you remove multiple arms, a ratchet strap around the axle and frame can pull it back into alignment. But honestly, doing it on the ground one arm at a time avoids the hassle entirely.

Torque Specs

Important: Re-torque all fasteners after 200–300 miles. The joints and bushings seat over the first few hundred miles, and a re-torque pass ensures everything stays tight.

Quick Decision Guide

Still not sure? Answer these questions:

• Is your truck stock power and mostly driven on the street? → Town Series
• Do you tow, haul, or go off-road on weekends? → Trail Series
• Do you have a supercharger, turbo, or use the truck for heavy work / track days? → Track Series
• Is your truck at stock height or using relocation brackets? → Fixed arms
• Have you lifted or lowered the truck and feel driveline vibes? → Adjustable arms

Frequently Asked Questions