My El Camino Launched Crooked Until I Did THIS! (Anti Roll Bar Tuning)

If your car leaves the line twisted up with one front tire in the clouds, it might look cool in photos—but it’s costing you consistency and ET. That classic “Shamu waving to the crowd” launch usually means the chassis is unloading one rear tire, steering the car, and making every pass a guess. That’s where a properly set up drag racing anti-roll bar comes in.

Sway bar vs. anti-roll bar (they’re not the same)

First, let’s clear up a common confusion. A rear sway bar is designed for handling balance. It works with the front sway bar to reduce body roll in corners and still has some flexibility built in. It’s great for street cars and mild builds and is definitely better than nothing.

A drag race anti-roll bar, on the other hand, is a much stiffer torsion bar that ties both sides of the rear suspension together under power. Its job is simple:

• Resist chassis twist on launch
• Keep both rear tires planted evenly
• Help the car leave flat, straight, and repeatable

On my El Camino, the factory-style F41 rear bar worked fine when the car was slower (around 1.80 60-foot, bottom 13s). But once power went up, the chassis twist became obvious. Upgrading to a big anti-roll bar helped knock 60-foots into the mid–low 1.70s and made launches far more predictable.

Do you actually need a drag anti-roll bar?

You should seriously consider one if:

• The car lifts one front tire noticeably higher than the other
• The car “walks” or steers on launch
• 60-foot times are inconsistent even when the tune and track are decent

If you already have an anti-roll bar and the car still does weird stuff, the bar probably needs to be set up and preloaded correctly.

Basic anti-roll bar setup on a drag car

Here’s the process I used under my ’82 El Camino:

1. Get the car at ride height
   Jack the car under the differential so the suspension sits as close to normal ride height as possible (stands under the frame are fine for safety).
2. Disconnect the end links
   With both sides unbolted, the bar should move through its arc freely. If it’s bound up or twisted, lube the bushings and square up the saddles on the housing so the bar is parallel to the rearend.
3. Square and align the bar
• The main tube should be parallel to the differential.
• The arms and vertical links should be as close to straight up-and-down as you can reasonably get when viewed from the side.
4. Lock the bar in position
   Once the saddles are square and the bar moves freely, tighten the hardware on the housing so its rotation is fixed relative to the rearend.
5. Set preload
   Most rear-wheel-drive drag cars want to lift the left front more because of engine torque. To help counter that and level the launch, you add a little preload into the anti-roll bar:
• Either shorten the driver’s side link or lengthen the passenger side link.
• On a single-adjustable setup, that usually means turning the rod end a turn or two, then jacking the bar slightly to get the bolt back into the bracket.

You don’t want crazy preload, just enough that when you bolt everything back up, the bar is carrying a little bias so the car leaves as flat as possible.

Fine-tuning at the track

Once you’re on the track:

• If the left front still comes up higher, add a bit more preload.
• If the car starts to “favor” the right or feels bound, back it off slightly.

The goal isn’t to crank everything solid, it’s to balance the hit so both rear tires share the work and the car goes straight.

A well-set-up drag anti-roll bar won’t make your car corner better, but it will make it launch straighter, flatter, and far more consistently. And in drag racing, those little details are exactly what turn sketchy passes into repeatable, winning ones.