Stop Tilting Your Differential.

Start Positioning It.

The First Low Profile Differential Positioning System for Toyota & Lexus IFS

Patent Pending

If you’ve lifted your Toyota or Lexus IFS truck, your front CV axles are no longer operating at the angles Toyota engineered.

From the factory, your front axles run nearly flat, typically between -1° and +1°. That’s ideal for:

• CV joint efficiency & strength
• Boot life
• Heat reduction
• Bearing longevity
• Fuel economy

But add 2 to 5 inches of lift to clear 33 to 42” tires… and that angle can jump to 10–14° or more.

The industry’s answer?

Hockey pucks.

And that’s where the problem begins.

The Truth About “1-Inch Diff Drops”

All “1-inch diff drop kits” simply insert 1″ spacers above the forward differential brackets like so:

Regardless of how it’s advertised or what you’ve been told, due to Toyota’s 3-point mounting geometry, dropping the forward mounts 1″ only lowers the axle centerline by just ~0.39″. This happens because the differential tilts forward & pivots around the fixed rear pinion mount rather than fully translating straight downward as shown in the interactive comparison below.

Click to Insert 1″ Spacer

① ② ③

① Factory frame mount points are used – no added stress
② The axle centerline stays in original position
③ The pinion aligns properly with the frame mount
All bushings and mounts remain in their neutral, unloaded position

Therefore, only a fraction of the spacer’s drop reaches the axles.
Not 1 inch. Not even half an inch.

And it creates three major problems:

1. Massive Ground Clearance Loss

2. Increased Bracket Stress

3. Pinion Frame Mount Bind & Stress

The result?

You lose clearance.
You gain stress.
You raise the risk of failure.

And you barely improve axle angle.

The Marlin Crawler Solution

We didn’t add spacers.

We redesigned the system.

From the frame down.

Our Patent-Pending Heavy Duty IFS Differential Drop System:

• Replaces both forward brackets with the drop & repositioning built-in
• Relocates the bushings from the frame to the differential
• Eliminates the bushing + spacer stack under the frame entirely
• Isolates & dampens differential assembly, reducing stress on R&P, locker, axles, CV joints
• Strengthens all mounting points
  • Adds double-shear mount to passenger side (optional, see FAQ 1.)
  • Adds second frame mount to driver side
  • Adds heavy duty pinion mount frame reinforcement plate (optional, see FAQ 1.)

Available Configurations

✔ 0.50″ Axle Centerline Drop Kit

• Drops axle centerline a TRUE ½-inch
• Replaces both forward mounts
• Only ½” thick brackets mounted below frame
• No modification to factory pinion mount
• Compatible with stock suspension or RCLT HD
• Compatible with M12 or M14 steering rack hardware
• Compatible with our new Ultimate Low Profile Skid Plate
• Designed to be compatible with existing skid plates (compatibility may vary, see FAQ 2.)
• Less labor to install than the 1.00″ Kit

Despite this only being our ½” drop kit, it achieves 29% more axle drop than all 1″ spacer kits.

If that sounds backwards, you’re not alone. Most differential drop kits are marketed by spacer thickness rather than actual axle centerline drop.

So what would it actually take to achieve a TRUE ½” drop using spacers?

You would need to stack a full 1″ spacer kit plus an additional 0.27″ spacer — a total of 1.27″ at the mount.

That results in over 3″ hanging below your frame.

Our system? Just 0.5″ below the frame — a 6.28× reduction.

Click the image below to see it for yourself.

Show ½” HD Drop Kit

① ② ③ ④ ⑤

① Requires 1.27″ of stacked spacers to achieve a true ½” drop
② System is forced into a ~5° bind – stressing bushings & mounts
③ Skid plate must drop sharply – sacrificing clearance
④ Pinion mount is pulled out of alignment – increasing stress at frame mount
⑤ Requires bulky mid-mount supports – adding weight & complexity

A “1-inch spacer kit” turns into a bulky, stressed, low-hanging system, and makes a simple problem complicated.

Instead:

You gain:

• Improved CV geometry & strength
• Much Stronger brackets
• Much Stronger frame mounts (all 3)
• Increased down travel potential
• Massive ground clearance improvement over any differential drop kit ever made

✔ 1.00″ Axle Centerline Drop Kit

• Drops axle centerline a TRUE 1-inch
• Replaces both forward mounts
• Only ½” thick brackets mounted below frame
• Modifies factory pinion mount
• Compatible with stock suspension or RCLT HD
• Compatible with M12 or M14 steering rack hardware
• Only compatible with our new Ultimate Low Profile Skid Plate (see FAQ 2.)
• Maximum CV angle & strength correction
• Maximum suspension travel & articulation potential

Our 1-inch drop kit achieves 158% more axle drop than any “1-inch” spacer drop kit

Scaling the same geometry, it would take more than TWO AND A HALF 1-inch spacer kits stacked together to produce a 1″ drop at the axle, resulting in over 4.4″ hanging below your frame.

Our system? Nearly 9× less ground clearance loss.

Compare the difference below.

Show 1″ HD Drop Kit

① ② ③ ④ ⑤

① Requires 2.51″ of stacked spacers for a true 1″ drop
② Forces the system into an extreme 10° bind – beyond bushing limits
③ Skid plate hangs dramatically lower – losing over a foot of clearance
④ Pinion mount shifts forward ~½” – bolt holes no longer align
⑤ Requires large stand-offs just to support the skid – adding weight and failure points

The result:

So if a spacer kit truly dropped your differential 1-inch like many companies claim:

• All three bushings go into an impossible 10° tilt – They don’t bend this much & would break!!
• The tilt moves the pinion mount forward nearly half an inch – Bolt holes don’t line up & would break your frame!!
• You’d need up to 10″ (M14x254mm) long bolts depending on setup – These bolts are not manufactured anywhere in the world!!

At this point, spacer kits completely break down and the geometry stops making sense.
The system is no longer just inefficient, it’s impossible.

As multiple prototype testers have told us, our design is truly Next Level.

Built Stronger Than Stock

Factory forward diff mounts are cast and both are known to crack & fail. They cost $260 to $290 each to replace, or worse as broken mounts often lead to a shattered front diff actuator that costs $593 + front diff rebuild labor. This TacomaWorld user running traditional diff drop spacers even had his oil pan punctured! 😱

Our brackets are:

• Laser cut from USA-made ½” oversized plate steel
• Extensive computer analysis (FEA) for maximum strength
• Tested for 3 years with 40″ tires + surviving 4× King of the Hammers race competitions & 3× full ULTRA4 race seasons
• Fully welded and reinforced
• Powder coated textured black

We also:

• Add a second frame bolt on the driver side
• Add double-shear to the passenger side
• Reinforce the pinion mount with a heavy duty oversized frame plate washer, increasing load rating by 78%.
• Contact the full face of the subframe, a whopping 230% more than stock, greatly reducing torsional stress on frame hardware & deforming the frame from high torque situations.

Developed Alongside RCLT HD

While developing and testing our RCLT HD long-travel suspension system, we began exploring ways to properly reposition the front differential rather than relying on traditional spacer-style diff drop kits that do not match the high ground clearance advantages of RCLT HD.

Prototype brackets first appeared on BigMike’s Tacoma and King of the Hammers race vehicles several years ago, where they quietly accumulated tens of thousands of miles of testing in extreme conditions.

That development ultimately led to the patent-pending system you see here today.

Engineered Bushings

We use high-durometer injection-molded elastomer bushings engineered specifically for differential torque loads:

• High compressive loads
• Oil resistance
• Temperature cycling
• Long-term durability
• Made in USA

Not generic polyurethane.
Not soft suspension bushings.
These are engineered OE-grade heavy duty bushings. They may be small but they are mighty, and there are 10 of them.

More Travel Potential

On many suspension systems the CV joints limit down travel. You’ve known this for years, but were misled by incorrect spacer drop kit messaging.

By properly lowering the differential:

• Our 0.50″ kit allows up to a true 0.50” more available down travel at the wheel hub
• Our 1.00″ kit allows up to a true 1.00” more available down travel at the wheel hub

This is huge for RCLT HD users or other setups where your ball joint is not the limiting factor.

More travel without changing arms.
More travel without changing axles.

Operating the CV Joints in Their Stronger Range

Constant-velocity joints are strongest when operating near their neutral position.

As axle angle increases, the internal load path shifts toward the outer edge of the CV bell and the contact geometry becomes less efficient. This is why axles are far less likely to break when the wheels are pointed straight ahead compared to when they are turned sharply.

Lifted vehicles increase CV operating angle significantly, placing the joints further away from their ideal geometry.

By lowering the differential 2.6× more than any spacer drop kit, your CV alignment is greatly improved and moved closer to their stronger operating range, helping reduce the mechanical stress placed on the joints during heavy load.

A Second Layer of Shock Moderation

Instead of torque loads traveling through long rigid brackets before reaching the bushings at the frame, we directly isolate the differential with bushings at its mounting points.

During sudden traction events, such as a tire grabbing a rock, slipping on snow, or rapid throttle application, our improved bushing positioning is better suited to absorb & dampen loads. That compliance may help moderate harsh shock transfer through the drivetrain, compared to bushings placed at the end of long rigid brackets.

The result is a drivetrain that not only runs at stronger CV geometry, but also benefits from controlled isolation at the differential itself.

Unlocking the Impossible

As discussed, the factory diff mount bushings (and any added spacers!) stack & hang below the front subframe.

Every skid plate on the market must bend sharply downward well in front of your subframe to clear them.

By relocating the differential bushings from the frame to the differential housing itself, the bulky frame-side mount stack disappears, and it’s as if the differential brackets do not exist at all.

This allows a true low-profile skid plate architecture for the first time ever on 4WD applications.

Unlocking something revolutionary… Introducing: The Marlin Crawler Ultimate Skid Plate (click for details)

The Bottom Line

Spacer kits only tilt the differential.

This system repositions it correctly, and introduces an entirely new ground-clearance-maximizing bushing architecture.

It’s the first diff drop kit that changes everything.

How can the two be true at the same time?
Take a look at the below image of our Ultimate Skid Plate installed. Here we have the lowest profile & most ground clearance 4WD skid plate ever designed with its straight, bendless profile, yet, underneath we simultaneously have the lowest diff drop ever achieved for these platforms. Incredible.

Vehicle Applications

Initial release for the following Toyota & Lexus IFS platforms:

• 2003–2024 4Runner / FJ Cruiser / GX
• 2005–2023 Tacoma

1995-2005 4Runner & Tacoma applications coming soon. Both Drop Kits will work on non-lifted stock setups, however, they are best suited for lifted applications where axle misalignment angles are increased.
For Hilux, Tundra, and Land Cruiser, see FAQ 3. & 4.

Works with:

• 4WD or AWD applications
• Stock suspension/UCA lifts
• Inline or Offset-style driver-side frame mounts
• Long travel suspension systems
• Marlin Crawler RCLT HD systems
• IFS frame drop kits or other miscellaneous IFS subframe modifications (see FAQ 6. & 7.)

Who Is This For?

✔ Lifted daily drivers
✔ Long travel trucks
✔ RCLT HD owners
✔ Rock Crawlers
✔ Desert Runners
✔ Weekend Warriors
✔ Anyone tired of “hockey puck” engineering
✔ Anyone who has been misled about diff drop kits
✔ Everyone who has broken or are worried about breaking their stock brackets & pinion frame mount

For about the same price as replacing worn, bent, or broken stock brackets, you get a complete system that actually fixes the root problem and unlocks ultimate ground clearance.

Need Kit Selection Guidance?

✔ Wish to keep your current skid plates? Use our ½” Drop Kit only
✔ Want more clearance but less install labor? Use our ½” Kit + Ultimate Skid Plate
✔ Want the best setup possible for maximum performance? Use our 1″ Kit + Ultimate Skid Plate

The following recommendations are based on actual CAD-measured front CV axle operating angles across various suspension heights, control arm lengths, and differential positions. In general, setups exceeding 6° of CV operating angle are recommended to use the full 1″ Drop Kit to reduce CV joint operating stress and improve long-term durability as much as possible.

While the chart above reflects our recommended setup based on CV operating angles and suspension geometry, both Drop Kit sizes may still be used interchangeably depending on your preferred skid plate setup and performance goals. Customers wishing to retain existing skid plates will generally prefer the ½” Kit, while the full 1” Kit is intended for use with our Ultimate Low Profile Skid Plate System. If you have a Frame Drop Bracket Kit where your LCAs are no longer attached to your frame, then you likely only need a ½” Drop Kit (see FAQ 6).

What the Community Is Saying

We’ve shared early prototypes of this system with experienced builders & fabricators, and also recently a sneak peak to our socials!

Here’s what people are saying so far:

“This is truly a next-level design.” — Dmitry, Stellar Built (owner)

“These diff mounts are a must. Not only do they drop your axle centerline for better CV angles, they protect the diff under torque keeping them alive in the rocks. It’ll keep CV’s alive pulling big travel.” – Alex, Sherpa Motorsports (owner, driver)

“These diff relocation brackets are awesome and are gonna pick us up a ton of ground clearance. Can’t wait to get them installed!” — Brad, Toyota Walnut Creek Racing (team manager, driver)

“This is the proper way to reduce CV angles. All other kits just rotate the differential and point the pinion in the wrong direction. It’s a waste of money and time doing these style of diff drops. We don’t sell them. Marlin Crawler’s new design is the only true diff drop to reduce CV angles.” — Nate, The Gear Shop (owner)

“Dope” — Quinn, 74weld (owner)

“Wow that’s a lot of clearance. 😎” — Louie @2a_crawlcamper

“Love it! Can’t wait. Exactly what I need. More clearance and strength. I broke one of my diff mounts already, and I hate dragging low hanging skid plates like a snow plow. This is a game changer.” — Jack @dinkeycabin

“Yes want it” — Adam @fishtaco831

“Cool 🙂” — @texastoast400

“Sickkk” — Kai @kai__larsen

“Yes. Please.” — @gx_crawl

“Looking at these brackets, they just make sense. Such a simple, yet brilliant design.” — Todd @xtremewlr

“Oooooooo I’m super interested in this!!!!!! Let me get my hands on some of that goodness!!!!” — @lmtl3ss_or

“Any gains in clearance is a worthwhile upgrade for our IFS trucks so I’m eager to see this on my truck!” — Christien @sandstormtaco

“Take my money!! I been needing something like this my stock mounts are smashed” — @_Faded_Yoda_

Have feedback of your own? We’d love to hear it! Submissions are reviewed and may even get posted above.

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“For years people asked why my Tacoma didn’t have a skid plate. Now you know why.“
— BigMike, HD Diff Drop & Skid Plate System Designer

Frequently Asked Questions

1. Optional installation parts included in every kit.
       • Passenger mount double-shear: Requires a small weld to rear subframe crossmember and is optional. This can be done during installation, anytime later, or entirely ignored.
       • Heavy Duty Pinion Mount Frame Reinforcement Plate: Optional, but only takes one minute to install and is recommended for everyone to strengthen their pinion frame mount.
2. Skid plate compatibly may vary. You’ll need to ensure sufficient air gap between the bottom of your differential and existing skid. We assume most skids have a ½” air gap, but not a whole inch. Therefore, for our 1” drop kit, we strongly recommend our Ultimate Low Profile Skid Plate.
3. Plans for Tundra, LC100, & LC200 Kits? We may do this pending demand. We’ll first be getting 1995-2004 Tacoma/4Runner kits to market and then re-evaluate.
4. Compatible with overseas Hilux? Sorry, but no. The subframes are different, brackets are different, and diesel oil pans are in different locations from our petro counterparts.
5. Compatible with LCA Frame Pivot Kit? Most likely, Yes. Because the frame pivot kit does not modify differential mounts and reuses stock brackets, our HD Diff Drop Kit is expected to work. However, we have never seen one of these kits in real life and do not know for sure if their proprietary skid plate offers any room for dropped differentials. Please check that you have sufficient clearance under your diff.
6. Compatible with Frame Drop Bracket Kits? Most likely Yes. While we cannot guarantee compatibility, so long as your original Toyota differential brackets are still being used these kits should work. Please evaluate all images, instructions, and measure the downward slope angle of your inner axle shafts/bars to determine fitment for yourself. Generally speaking, if your axles have between a 2°–6° slope angle, use the ½” Drop Kit. If greater than 6°, use the 1″ Drop Kit.
7. Compatible with any other type of miscellaneous IFS subframe modification? Potentially. So long as whatever setup you have is still using your original Toyota diff brackets, our HD Diff Drop Kit should work. Please evaluate all images, instructions, and measure the downward slope angle of your inner axle shafts/bars to determine fitment for yourself. Generally speaking, if your axles have between a 2°–6° slope angle, use the ½” Drop Kit. If greater than 6°, use the 1″ Drop Kit.
8. Any frame modifications? No. However, if you have our Heavy Duty LCA Frame Brace Kit installed, then you’ll have to cut off about a 1.5″ section to clear the left side bracket. See Instructions in the Instructions tab above for more information.
9. Does it affect vehicle alignment? No. Lowering the differential only reduces the angle of CV axles, not the steering tie rods. Alignment and steering feel are unaffected.