Adjusting the Drag Link on a Semi Truck: A Step-by-Step Guide

If you're dealing with a lifted semi truck, you may encounter issues with the drag link's length and steering performance. In this article, we'll walk you through the process of adjusting your drag link to ensure proper alignment and functionality.

First, inspect your drag link setup to determine if it's still stock or has been modified in some way. If you're unsure, take a closer look at the threads showing on the sleeve; typically, there should be about 1/2' to 3/4' of thread exposed. Additionally, check the steering arm alignment – ideally, it should be perpendicular to the frame rail.

To begin the adjustment process, turn the sleeve top outward (away from the tire) to increase its length or inward (toward the tire) to shorten it. Make sure your steering is unlocked and grab an 11/16 socket and a 5/8 open-end wrench. Loosen the adjuster sleeve bolts, which should bring the drag link about 1/8 of an inch shorter in front.

Once you've made the necessary adjustments, lower the truck back down to the ground. Use a tape measure or a jig with sliding pointers to verify the scribed line at the 3:00 and 9:00 positions on each tire. This will help you identify any misalignment issues.

Next, spin each tire individually and place a board with a nail near the center point (or wherever you can achieve a perfect scribe). Rotate the tire 360 degrees to ensure that the line is consistent around the entire circumference.

When adjusting the toe, aim for a straight-ahead direction as best as possible. Then, jack up both front wheels slightly (about 1 foot) using a 1x4 or similar material. Drive a 16d nail through one end and bend it over at a 45-degree angle.

In many cases, a lifted semi truck may require only minor tweaks to the drag link adjustment. However, if your axle is significantly off-center, you may need more substantial adjustments to restore proper steering performance.

Keep in mind that when you lift your semi truck, you effectively shorten the drag link by moving the axle away from the steering box, which can reduce turning ability on the right side. If this is the result of a lift kit, you shouldn't need extensive tweaking – but it does depend on how far off-center you are.

By following these steps and taking into account any specific adjustments required for your semi truck, you should be able to achieve proper drag link alignment and steering performance. Remember to double-check your work and make sure all bolts are tightened securely before putting your truck back in service.

Drag link semi truck