How to Install Truck Side Steps | Mounting Order That Works

Installing truck side steps looks harder than it is, but there’s a catch most first-timers hit: the sequence matters more than the muscle. Tighten the brackets before the step is aligned and you’ll redo the whole job. The good news is that nearly every kit follows the same logic — mount the brackets, set the board, align, then torque. What changes between trucks is where those brackets attach. Some use factory step studs, some use cab mount bolts, and some need holes drilled into the body. Your exact truck model and the kit’s part number decide which path you take.

What You Need Before Starting

Before touching a wrench, confirm the kit’s part number or model name matches your truck’s make, model, trim, and cab configuration. These products are not universal — a kit built for a crew cab may not fit a regular cab, and the mounting points differ between body styles.

Basic prep steps that appear across manufacturer guides:

• Verify all parts and hardware are present before beginning
• Read the full instruction sheet and identify the correct left/right or front/middle/rear mounting locations
• Park on level ground and set the parking brake
• Some guides require disconnecting the negative battery terminal before work starts
• Remove factory steps if your truck has them

If your kit calls for drilling, make sure you have the correct bit size before you mark anything.

The Mounting Sequence, Step by Step

Every manufacturer guide follows the same basic order: mount the brackets loosely, set the board, align everything, then tighten from the bottom up. Here’s the sequence that appears consistently across current instruction sets.

Step 1: Install clip-on nuts where required. Some kits, like the Ford F-150 RB20 Side Steps guide, require placing 3/8-inch clip nuts in holes located inside the vehicle body before the brackets go on. Others skip this entirely. Your instruction sheet will say which.

Step 2: Attach the mounting brackets. Fasten the brackets to the factory mounting studs, body mount bolts, cab mount bolts, or frame points — whichever your kit specifies. Do not tighten them fully yet. Nearly every guide says to attach front and rear brackets without tightening at first, so you can adjust later.

Step 3: Set the step board onto the brackets. Position the running board on top of the mounting brackets, then loosely fit the remaining hardware. One manufacturer video guide for FB21374–FB21387 Truck Side Steps shows the step laid onto the brackets after they’re secured to the factory step studs, then fastened with the remaining hardware.

Step 4: Align level and centered. The step must sit level and centered relative to the cab and, for the Current Chevy 1500/2500 ADD Lite Side Steps guide, straight relative to the doors. One guide notes the raised mount on that kit goes toward the rear of the truck. Adjust tube or step level before any final tightening.

Step 5: Tighten bracket-to-vehicle hardware first. This is the order that matters most. Once alignment is set, torque the bracket-to-vehicle fasteners, then tighten the step-to-bracket hardware last. If you skip alignment before torqueing, the step can sit crooked permanently.

Torque values are product-specific. Another simply says to tighten to the manufacturer’s specification. Use a torque wrench, not a pneumatic impact — one guide explicitly warns against impacts for final tightening.

Step 6: Re-check after driving. Vibration from daily driving will loosen hardware that felt tight in the driveway.

Where Brackets Mount Varies By Truck

The single biggest difference between kits is the mounting point. There is no universal attachment method. Current instruction sets reference an array of specific locations:

• Factory step studs (common on trucks with factory steps removed)
• Cab mount bolts (used by the Chevy ADD Lite guide)
• Body mount bolts and rocker panel mounting points
• Frame or flange attachment points on work-truck applications

Some kits require drilling, which means your truck has no factory holes in the right place. When drilling is required, the guide typically says to mark the location, confirm it, then drill with the specified bit size (often 5/16-inch or 11/32-inch). The work-truck guide referenced above also notes the assembly should be on a flat surface with access to both sides of the mounting area before you start.

Common Mistakes That Ruin The Install

The mistakes that appear across user reports and guide warnings all trace back to the same root causes — rushing the sequence or skipping the final checks.

Tightening brackets too early. If you crank the brackets down before the step is set and aligned, you’ll fight the hardware angle for the rest of the job. Loose brackets during assembly are the design, not a flaw.

Skipping the post-install re-torque. The 100-mile re-check is the difference between a quiet, solid step and one that rattles loose on the highway.

Wrong side or orientation. Kits with directional parts, like the Chevy ADD Lite’s rear-facing raised mount, will not install correctly if one side is swapped.

Drilling without confirming application. Drilling the wrong size hole or into the wrong panel affects fitment and finish, and it can’t be undone. If the instruction sheet is unclear about the exact hole location, stop and verify against the vehicle application before you make a hole.

For readers comparing options before they buy, our roundup of the best truck door step options on the market covers which products fit which trucks — worth a look before you commit to a mounting location.