4x4 Chassis Protection Kit

$237.00 USD
Free delivery on $75+ orders.
Price includes duties and taxes.
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Deep-clean hidden salt, mud and grime from inside your chassis rails, then protect exposed metal with a durable hydrophobic corrosion barrier.

Flushes mud, salt, and grime from chassis rails
Six magnets for a secure hold, six jets for full internal coverage
Prepares and protects exposed metal from corrosion
Cures to a hydrophobic, non-stick finish
Protection lasts 6 to 12 months
Rust Shield Quantity
30-DAY MONEY BACK GUARANTEE 12-MONTH WARRANTY
Ultimate 4x4 Wash & Protection Kit
UPGRADE
Ultimate 4x4 Wash & Protection Kit

$562.00 USD

UPGRADE

Description

Protect the parts of your 4x4 that are hardest to see, and often the most exposed to corrosion. The 4x4 Chassis Protection Kit is designed to flush salt, mud and grime from inside chassis rails, then help protect clean, dry metal surfaces from moisture and rust.

The magnetic chassis flusher plugs directly into compatible chassis rails and uses six high-powered water jets to deliver a deep internal clean. Once the chassis is clean and dry, use the included surface cleaner and brush to prepare exposed areas before applying Rust Shield for long-lasting corrosion defence.

Features:

  • Flushes salt, mud and grime from inside chassis rails
  • Helps prevent internal and external chassis corrosion
  • Six high-powered jets for broad 360-degree internal coverage
  • Six neodymium magnets create a secure hold to the chassis rail
  • 90-degree tapered brass fitting for improved clearance
  • Includes cleaner and brush for preparing exposed metal surfaces
  • Protective coating cures to a clear, hydrophobic, non-stick finish
  • Ideal after beach driving, muddy tracks, salted roads and off-road trips

Specifications

    Chassis Flusher:

    - 12mm inlet shaft

    - 15mm chassis flusher nozzle

    - 6 x neodymium magnets

    - 6 high-powered jets with 360-degree spray coverage

    - 90-degree tapered brass fitting

    - 1/4-inch brass hose fitting

    - Connects directly to a standard garden hose

    Protective coating:

    - Oil-based formula

    - Cures to a hydrophobic, non-stick finish

    - Typical protection duration: 6–12 months, depending on driving conditions and off-road use

Included Items

1x Undercarriage & Chassis Wash (1 Litre / 33.8 fl oz.)
1x Rust Shield (500ml / 16.9 fl oz.)
1x All Purpose Cleaner (500ml / 16.9 fl oz.)
1x Chassis Frame Flusher
1x Universal Flusher Canister
1x Flusher Hose
1x Soft Bristle Brush

How to Use

Step 1: Flush the chassis rails
Plug the Chassis Frame Flusher into a compatible chassis rail on your vehicle, trailer or caravan.

Step 2: Add wash solution
Pour 100mL / 3.38 fl oz. of Undercarriage & Chassis Wash into the Universal Flusher Canister.

Step 3: Connect the system
Connect the canister to the Flusher Hose, then connect the hose to a standard garden hose.

Step 4: Flush thoroughly
Turn the canister dial to setting 3, shown as the largest dot on the dial. Flush the chassis rail, moving the flusher through the rail 2–4 times.

Tip: Park the vehicle on a slight decline, or begin at the highest point of the chassis rail and work downwards to help dirty water drain away.

Step 5: Prepare exposed metal
For exposed chassis and suspension areas, use All Purpose Cleaner with the brush to remove grease, grime and residue. Rinse thoroughly and allow all target surfaces to dry completely.

Step 6: Apply protection
Spray Rust Shield evenly onto clean, dry exposed metal surfaces.

Step 7: Allow to cure
Allow approximately 3 hours to tack dry before normal dry-road driving. Allow 3–4 days to fully cure before wet-road driving, beach driving or off-road use. Confirm it has cured to a non-stick finish before heading out.

Warranty

We proudly offer a limited manufacturers warranty on all hardware products, ensuring they are free from defects in materials and workmanship under normal use and maintenance for a period of 12 months. This warranty is extended only to the original purchaser and is non-transferable.

This Warranty Covers:

  • Defects in the materials and workmanship under normal use.
  • Replacement of faulty components or, if necessary, the entire product.

This Warranty Does Not Cover:

  • Damage caused by misuse, improper handling, or neglect.
  • Normal wear and tear including degradation due to exposure to harsh environmental conditions.
  • Incidental or consequential damage arising from the use of the product.
  • Modifications or alterations to the product not authorized by Salt Shift.
  • Damage resulting from improper assembly, disassembly, or failure to follow instructions.

Money-Back Guarantee

We stand behind the performance of every Salt Shift product, but if it’s not right for you, we’ve got you covered with our 30-Day Money Back Guarantee. Simply request a return within 30 days of purchase, and we’ll process a hassle-free refund.

Learn More About Our Guarantee

Shipping & Delivery

Orders ship from our Gold Coast warehouse within 2 business days (or up to 10 during big promos) using a trackable courier, domestically and worldwide. You’ll get a tracking link as soon as your order’s on the move. If your parcel comes back due to a wrong address or no collection, we can resend it for a small additional shipping fee.

Learn More About Shipping & Delivery

WHAT’S INCLUDED:
Undercarriage & Chassis Wash
Undercarriage & Chassis Wash
4x4 Rust Shield
4x4 Rust Shield
All Purpose Cleaner
All Purpose Cleaner
Universal Flusher Canister
Universal Flusher Canister
4x4 Magnetic Chassis Flusher
4x4 Magnetic Chassis Flusher
Soft Brush
Soft Brush

Clean Inside the Chassis Rails

Salt and mud can collect inside chassis rails, where a normal wash cannot reach. This kit helps flush out hidden buildup before it has the chance to hold moisture against your vehicle’s metal.

Purpose-Built for Hard-to-Reach Areas

The magnetic flusher plugs into compatible chassis rails and delivers six high-powered water jets for a thorough internal rinse. Strong neodymium magnets help hold it in place while you clean.

Start With a Deep Flush

A clean chassis is the foundation of effective protection. The included wash formula helps break down salt, mud and grime so it can be rinsed away with fresh water.

Prep the Areas That Need Protection

Use the cleaner and brush to remove grease and contamination from exposed chassis, suspension and metal components before applying the protective finish.

Durable Corrosion Defence

Once applied to clean, dry metal, the protective coating cures to a hydrophobic, non-stick barrier that helps defend against moisture, salt and corrosion for 6 to 12 months, depending on driving conditions and off-road use.

Made for Regular 4x4 Maintenance

Use after beach trips, wet tracks and muddy adventures to help keep your chassis clean, protected and ready for the next drive.

NATA Accredited Lab Testing

Salt Shift Rust Shield has been independently tested by a NATA-accredited laboratory in Australia to validate its corrosion-protection performance.

Sand Does Not Stick

The cured protective finish helps prevent sand and dirt from clinging to protected surfaces, making ongoing maintenance easier.

FREQUENTLY ASKED QUESTIONS

Will the flusher fit every vehicle?

It is designed for compatible chassis rail openings. Check that your vehicle, trailer or caravan has an accessible chassis rail opening before use.

How does the magnetic flusher stay in place?

Six neodymium magnets help secure the flusher to the chassis rail during use.

Why should I flush inside my chassis rails?

Salt, mud and moisture can collect inside chassis rails where they are difficult to see and clean. Regular flushing helps remove this buildup before it contributes to corrosion.

When should I apply the protective coating?

Apply it after surfaces are clean, dry and free of grease or water residue. It is intended for exposed metal surfaces, not the inside of enclosed chassis rails.

Are your products safe to use on all surfaces?

Yes! Our formulas are non-corrosive and safe for gel coat, fiberglass, aluminum, stainless steel, plastics, rubber, and painted surfaces. They effectively remove salt deposits without causing damage.

Will Salt Shift strip wax or protective coatings?

No! Our formulas are pH-balanced and designed to clean effectively without stripping wax, ceramic coatings, or protective sealants.

Is it safe to use on my vehicle?

Yes, the Salt Shift wash is formulated to be safe for all vehicle surfaces, including paint, metal, and plastics. It’s tough on contaminants but gentle on coatings and finishes.

Will Salt Shift wash prevent corrosion?

Yes, regular use helps prevent corrosion by removing salt and contaminants that can damage metal surfaces.
Rider carving on a Jet Tech ski

30-DayMoney Back Guarantee

First-time purchases are covered by our 30-day money-back guarantee, subject to eligibility and return requirements.

We’re confident you’ll love it.

  • 12Month
    warranty
  • 55K+Riders
  • 4.8/5Rider
    reviews

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Customer Reviews

Overall rating: 4.9 / 5 from 519 reviews.

Customer photo review of 4x4 Rust Shield

Hi I've recently washed the underbody with the treatment product. Then applied the rust prevention product. Looking great at the moment. Let's see how it lasts. Thanks Mark

Mark B. 5/5 Verified

4x4 Rust Shield

Customer photo review of 4x4 Rust Shield

Start by saying, I live in the salt belt, Ohio, USA. Tried a few products over the years. Your Salt Shield goes on flawlessly and my wife's biggest complaint was the odor of the other products. Yours smells less potent and the odor doesn't last as long. Hardly no mess. If it lasts through the winter I will definitely be using your products again. Thank you guys Danny

Danny M. 5/5 Verified

4x4 Rust Shield

Great produce, restore bull bar

Joe D. 5/5 Verified

4x4 Rust Shield

Great product quick delivery and excellent result on a 200 series landcruiser

Paul L. 5/5 Verified

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Have not had the opportunity to test this product as yet

Harry P. 5/5 Verified

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Customer photo review of 4x4 Rust Shield

Great product and easy to apply. Now I’m ready for my beach adventure!

Mat N. 5/5 Verified

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Good product, performs exactly as it says it does

Leigh M. 5/5 Verified

4x4 Rust Shield

This product is great. My truck is 21 years old. Made my undercarriage look like new. Not too glossy or flat like paint would be. Looks like a factory powdercoat. Doesn't make the mess with overspray like paint does either. Would highly recommend.

David A. 5/5 Verified

4x4 Rust Shield

Great product easy to apply will buy more of your products 👍

Kobus M. 5/5 Verified

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Customer photo review of 4x4 Rust Shield

Loved the salt shift process, easy to do and a lot less messy than the last product I used. Infact I even used less than I thought I needed to do my whole Ranger chassis. Even coated the rear half twice due to what I use my vehicle for. Chassis flush so easy to use, the undercarriage wash was also great, although was unsure if supposed to dilute it or apply straight because I had to use was a snow foam bottle due to being only thing I had to apply it, so did use the whole 1ltr bottle between the chassis flush and washing with pressure washer. Only thing i can see thats different, is it hasn't dried as a full gloss finish? Not sure if its just rhe way my chassis is or if I didn't do the wash correctly or if not using the all purpose cleaner was the issue as I didnt feel I needed to use it?

Calum A. 5/5 Verified

4x4 Rust Shield

Customer photo review of 4x4 Rust Shield

I live in Wisconsin USA. We get some nasty winter weather here. I was using a lanolin base product that works well but collect a lot of dirt and makes servicing the undercarriage very messy. I decided to give salt chef to try sprayed two cars loved what I saw and ordering a second batch shipping was reasonably fast for how far it was coming. Communication communication was great and the end result very pleased with best regards, Jim.

James G. 5/5 Verified

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Customer photo review of 4x4 Rust Shield Bundle

I was a little skeptical, at first if this if this stuff really works. When I got my truck down it looked brand new underneath. Lot easier to clean, nothing sticking to it. Very impressive, been telling everyone about it. A must if you own a 4x4. Thanks again for making amazing products.

Glenn D. 5/5 Verified

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Works great on my quads!!

Kassidy T. 4/5 Verified

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It was empty when I received it.

Stan P. 1/5 Verified

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Customer photo review of 4x4 Rust Shield

Extremely easy to apply and looks amazing

Taylor P. 5/5 Verified

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Easy to apply leaves a great looking finish!!

Michael R. 5/5 Verified

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Customer photo review of 4x4 Rust Shield

Rust Shield keeps everything looking brand new! You guys should have a dealer in the United States so we could get the product quicker. It took a month or more to get the Rust Shield on my first order through Amazon. My second order, I went directly through your website and it was slightly faster. Thanks for the great product!!!!!!!!!

Mark B. 5/5 Verified

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Customer photo review of 4x4 Rust Shield

Amazing product works and looks great.

Randy L. 5/5 Verified

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Frame looks like it’s freshly painted. Drove through some flood water downtown during a nor’easter at our beach town. Frame had a cloudy look again. Just sprayed it with a pressure washer, water only. Looked brand new again.

Robert C. 5/5 Verified

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Customer photo review of 4x4 Rust Shield

Very happy with this works well on my 4 wheel drive we'll definitely buy this again.

Greg F. 5/5 Verified

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Customer photo review of 4x4 Rust Shield

Rust shield really works 💪 I've been to the Cape and back with river crossings on the beaches and the dusty tracks etc and everything under the ute is still clean as I love this stuff

Nev P. 5/5 Verified

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Seems to work well, we live Oahu close to the beach so we will see how it holds up in the long run.

Gus D. 5/5 Verified

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Did my f150 and now my new quad

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I like the Salt Shift much better than other undercarriage rust treatment as Salt Shift does not turn everything black. The frame and running gear looks new and it coats without changing the natural colors of the other components. Two thumbs up!

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Customer photo review of 4x4 Rust Shield Bundle

I’m 55 this year. Was a detailer before my mechanical apprenticeship in the early 90’s. In that time I can tell you of 3 products I would recommend because they work. A particular black RTV silicone. A particular injector cleaner in a bottle. And rust shield from salt shift. I just did the recommended 12 month reapplication and the results are amazing. I almost felt like it didn’t need the top up. Sensational.

Peter T. 5/5 Verified

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Customer photo review of 4x4 Rust Shield

Just washed the Jeep, once dried I sprayed the under carriage per the instructions. I did get some on the fenders which are powder coated steel and faded they now look new as does the under side. This stuff just works the only downside is it took 3 days to dry and I attribute that to the humidity but it was definitely worth it!

Greg C. 5/5 Verified

4x4 Rust Shield

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