Toyota Tacoma Rear Suspension Upgrade and Install

The 2024+ Toyota Tacoma and 2022–2023 Tundra share a solid rear axle that responds incredibly well to upgraded control arms, a track bar, and heavy-duty sway bar end links. In this guide, Spence from Core 4x4 walks through the complete rear suspension upgrade on a brand-new 2024 Tacoma — covering tool requirements, arm matching, torque specs, and the track bar install that ties everything together.

Whether you are running the truck at factory height or prepping for a 6-inch lift down the road, installing adjustable rear control arms now gives you the foundation to correct wheelbase, pinion angle, and axle centering at any ride height. This is Core 4x4’s latest platform — and the Tacoma earned some genuine respect in the shop.

Fitment: Toyota Tacoma 2024+ and Toyota Tundra 2022–2023. Core 4x4 also makes front upper control arms for this generation (coming soon).

What’s in the Kit?

Core 4x4 offers a full rear suspension package for this platform that includes control arms, sway bar end links, and a track bar (panhard rod). Spence laid everything out on the table before the install:

• Eight control arms — four uppers and four lowers. The lowers control your wheelbase (where the wheel sits in the wheel well), and the uppers set your pinion angle and driveline angles.
• Sway bar end links — available in multiple lengths to fit any lift height. These replace the thin factory end links that are prone to bending and looseness.
• Track bar (panhard rod) — centers your rear axle left-to-right under the truck. Without an adjustable track bar on a lifted truck, your axle shifts to the driver side and the truck crab-walks.

Steel vs. Aluminum: Two Options for Every Build

Core 4x4 offers two versions of their Tacoma/Tundra rear control arms:

Both versions are equally strong. The aluminum arms feature machined wrench flats that make adjusting and tightening the jam nuts easier, which is a nice touch on a platform where you may be dialing in arm lengths more than once as you build out the truck.

What Each Component Does

Before bolting anything on, Spence broke down the function of each rear suspension component:

• Lower control arms: These primarily affect your wheelbase — where the wheel sits front-to-back in the wheel well. When you lift the truck, the wheelbase changes. Adjustable lowers let you correct that.
• Upper control arms: These set your pinion angle and driveline geometry. Incorrect pinion angles cause vibration, premature U-joint wear, and drivability issues. Adjustable uppers let you dial in the angle for your specific lift height.
• Track bar (panhard rod): Centers the axle left-to-right. As lift height increases, the panhard angle steepens and pulls the axle to the driver side. An adjustable track bar corrects the offset so the rear end tracks true with the front.
• Sway bar end links: Firm up the rear end and reduce body roll. The factory end links are thin and can bend or break under heavy flex. Upgrading to Johnny Joint end links keeps the sway bar angle correct and the rear end planted.

Tools Required

One of the pleasant surprises on this platform: the entire control arm and track bar install uses just a 19mm wrench and socket. The end links use 17mm. Here is the full list:

• Ball-peen hammer or dead blow
• Flathead screwdriver or pry bar (for alignment and holding joints)
• Crows feet — 1-5/8” (control arm jam nuts) and 1-1/2” (track bar jam nut)
• Torque wrench (needs to reach 250 ft-lb for jam nuts)
• Standard ratchet
• Wrenches: 19mm, 18mm, 17mm
• Sockets: 19mm, 18mm, 17mm
• 6mm Allen head (for end links)
• Impact driver and extensions
• Breaker bar

Install Tip: Do This on the Ground

Important: If you are matching factory arm lengths (not changing lift height), this install is significantly easier on the ground with the weight of the truck on all four tires. With the suspension loaded, the axle stays in position and bolt holes line up naturally. Spence did this install on a lift for the video, which required more maneuvering — especially for the track bar.

Step-by-Step: Control Arm Replacement

Step 1 — Remove One Arm at a Time

Start with one lower control arm. Remove the 19mm bolts on both ends and pull the factory arm. Props to Toyota here — the hardware came apart cleanly with just a 19mm wrench and socket for the entire control arm and track bar portion of the install.

One issue Spence ran into: the second bolt required removing the shock to get clearance. The factory assembled the bolt behind the shock body, meaning it cannot slide out with the shock in place. A minor annoyance, but something to be aware of.

Step 2 — Match Arm Lengths

Since this truck is staying at factory height, Spence matched arm lengths by laying the new Core 4x4 arm on top of the old factory arm and adjusting until the bolt holes lined up. The new arms include reducer sleeves for the factory 14mm bolt hardware, so those slide in before final assembly.

Core 4x4 also offers optional Grade 8 hardware if you want to upgrade from the factory fasteners — worth considering for any truck that will see trail use.

Step 3 — Why You Can Torque in the Air

Factory rubber bushings have a fused crush sleeve. When you bolt them down with the suspension at full droop and then set the truck on the ground, the bushing preloads because the sleeve cannot rotate. That preload kills bushings over time.

The Core 4x4 arms use polyurethane bushings with independent crush sleeves (or Johnny Joints with free-rotating ball centers). The sleeve rotates freely regardless of suspension position, so there is zero preload whether you torque in the air or on the ground. This is a genuine mechanical advantage over factory-style bushings.

Step 4 — Torque Specs

Jam nut tip: If you do not have a torque wrench that reaches 250 ft-lb, get them as tight as you possibly can. You cannot over-torque a jam nut. After the initial install, do a break-in of 300–500 miles and then re-check that all jam nuts are still seated. Once confirmed, they are set for good.

Step 5 — Jam Nut Technique

The control arms are double-threaded (adjustable from both ends). To tighten the jam nuts without damaging the powder coat:

1. Start on one side and tighten until the arm body starts to spin
2. Switch to the other side and tighten
3. Work back and forth until the arm locks down
4. Use a flathead screwdriver or pry bar in the joint to keep it from rotating
5. You can also hold the tube of the arm for extra leverage

For the upper control arms, where access to the axle-side jam nut is tight, Spence used a bench vise to pre-seat the jam nuts before installing the arms on the truck. This is a valid shortcut when you are matching factory lengths and know you will not need to re-adjust.

Sway Bar End Link Upgrade

When Spence pulled the factory end link off, the difference was obvious. The factory link is roughly 1/4-inch thin material that was already loose. The Core 4x4 replacement uses a 3/4-inch Johnny Joint that eliminates all the slop and firms up the rear end significantly.

A few notes on end link installation:

• The kit includes spacers that install on the frame-side bracket to provide proper clearance
• There is a driver-side and passenger-side end link — not for function, but for grease fitting accessibility
• Install with grease fittings pointed forward and outward so you can service them easily
• If you install them backwards, they still work — the fittings are just harder to reach

Track Bar (Panhard Rod) Install

Critical: Always install the track bar on the ground with the truck’s weight on all four tires. On the lift, the axle hangs at full droop and shifts to the driver side because gravity pulls the unsupported axle weight down and sideways. Pulling the factory track bar off on the lift makes it extremely difficult to get the axle back in position for the new bar.

With the truck on the ground and loaded, the track bar swap is straightforward — match the factory length, bolt in the new adjustable bar, and you are done. When the customer later adds his 6-inch lift, he will adjust the track bar to re-center the axle at the new height.

What You Will Notice After the Install

• Better towing stability: Eight adjustable control arms and heavy-duty end links eliminate the vague, loose feeling that factory rubber bushings allow under load
• Reduced body roll: The upgraded sway bar end links firm up the rear end and reduce tail wag, especially on uneven roads or during lane changes
• True tracking: A properly centered track bar means the rear axle follows the front end instead of crab-walking
• Future-proof adjustability: When you add a lift, you can dial in wheelbase, pinion angle, and axle centering without buying new parts
• Better off-road flex: Johnny Joints and polyurethane bushings with independent crush sleeves cycle freely without preload, giving you more articulation than factory rubber bushings

Frequently Asked Questions

Shop Toyota Tacoma & Tundra Rear Suspension

Fitment: Toyota Tacoma 2024+ | Toyota Tundra 2022–2023. Questions? sales@core4x4.com | support@core4x4.com