Everything New On Weather Guard's 04 Series Boxes

Weather Guard’s 03 series toolboxes set a high bar for jobsite-ready truck storage. The new Weather Guard 04 series keeps the same fitment, sizing and overall build quality — but adds a few smart updates that make daily use a little easier.

In this video, Ryan from Upfit Supply compares two nearly identical low-profile full-size saddle boxes: a 03 series (third generation) and a 04 series (fourth generation). If you’re shopping for a new crossover box or trying to decide whether to grab a deal on an 03 series, this breakdown will help you choose confidently.

Quick Answer: 03 vs 04 Series — What Actually Changed?

From the outside, these boxes look almost identical. Ryan notes the sizing is the same, the fitment is the same and the weight is nearly identical. Most changes are small but meaningful improvements to how the box operates day to day.

If you're shopping, start here:

• Weather Guard crossover boxes
• Weather Guard Lo-Side truck boxes
• Weather Guard brand page
• truck tool boxes

The Big One: A Better Visual Indicator for Locked vs Unlocked

The most noticeable 04 series upgrade is the push-button lock behavior.

03 series lock behavior

On many 03 series boxes, when you lock the box and remove the key, the push button stays in the “out” position. The box is locked, but at a quick glance it’s not obvious. You typically have to look at the orientation of the keyway to confirm whether it’s locked.

04 series lock behavior

On the 04 series, when you lock the box, the push button can be pushed flush into the housing. That gives you an instant visual check: button in = locked. It’s a small change that makes a big difference when you’re moving fast on the jobsite and you want to know your tools are secure.

Bonus note from Ryan: the 04 series locks also seem to “code” a bit smoother than the 03 series. Either way, they use the same OEM-style key system and the same one-time lock programming approach.

Still the Same One-Key UltraLock Concept

Both 03 and 04 series boxes use Weather Guard’s one-time key coding approach. The lock ships uncoded and you program it the first time you use a key. This allows you to key multiple boxes alike across your truck or fleet.

If you need the step-by-step process, link this post to your companion guide on how to key Weather Guard toolbox locks.

Update No. 2: Improved Interior Latching Mechanisms

Inside the box, Weather Guard updated the latching mechanisms on the 04 series. The goal is smoother opening and closing with fewer snags. Ryan notes this is one of the main internal differences between the generations.

Most other interior components remain the same, including the accessory tray and overall box construction.

Minor Styling Updates: Badges and Placards

There are also minor exterior styling changes on the 04 series — particularly how the Weather Guard badges/placards attach. Ryan describes the 04 series badge as looking a bit more industrial, while the 03 series uses a more standard emblem style.

These changes don’t affect fit or function, but they can help you identify which generation you’re looking at.

Small Hardware Tweaks: Tie-Down Ring Attachment

Both series include exterior tie-down rings for securing light loads in the truck bed. The rings look nearly the same, but Weather Guard made a small update to how the tie-downs attach to the box, including differences in the backing plate and bolt sizing.

Functionally, you’re still getting the same idea: a handy place to secure smaller items. These aren’t meant for heavy load-bearing tie-down situations.

What Didn’t Change: Fit, Sizing and Core Build Quality

Ryan’s overall takeaway is that these two boxes are extremely similar. Both feature:

• Push-button opening
• Gas struts for smooth lid operation
• Strong lid structure with minimal flex
• Accessory tray support channels
• Weather Guard’s proven crossover box design

If you find a good deal on an 03 series box, it can still be a smart buy — especially if the new visual lock indicator isn’t a must-have for you.

Important: Which Weather Guard Boxes Are Moving to 04 Series?

As explained in the video, the 04 series updates are being applied primarily to:

• Weather Guard crossover (saddle) boxes
• Weather Guard Lo-Side truck boxes

Other Weather Guard toolbox styles may remain on the 03 series or even older series depending on the product category.

03 vs 04 Series Recap

Here’s the quick summary of what’s new on the 04 series:

• Improved push-button locks with a clear locked visual indicator (button sits flush when locked)
• Updated interior latching mechanisms for smoother operation
• Minor badge/placard styling changes
• Small tie-down attachment updates

Shop Weather Guard 03 and 04 Series Truck Tool Boxes

If you’re ready to upgrade your truck storage, these are the best places to start:

• Shop Weather Guard crossover boxes
• Shop Weather Guard Lo-Side truck boxes
• Browse truck tool boxes
• Explore Weather Guard

Frequently Asked Questions

How can I tell if my Weather Guard toolbox is 03 series or 04 series?

Many boxes look nearly identical, but the 04 series lock typically allows the push button to sit flush when locked. There may also be slight differences in badges/placards and small hardware details.

Do Weather Guard 03 and 04 series boxes use the same key system?

Yes. Both use a one-time coding approach where you program the lock to your chosen key during first use, which makes it easy to key multiple boxes alike.

Are Weather Guard 04 series boxes better than 03 series?

The core build and fitment are very similar. The 04 series adds small usability improvements, especially the clearer locked indicator and updated latching mechanisms.

Which Weather Guard boxes are available in the 04 series?

As covered in the video, the 04 series updates are being applied primarily to Weather Guard crossover (saddle) boxes and Weather Guard Lo-Side truck boxes.

Upfit Supply — for the good of the trades.