C4 Fabrication 4Runner Full Skid Plate System, 4th Gen 2003-2009

The C4 Fabrication Full Skid Plate System for the 4th Gen Toyota 4Runner (2003–2009) is a three-piece, 100% bolt-on underbody protection kit built from 3/16" CNC-cut pickled-and-oiled steel that covers the engine, transmission, and transfer case without any drilling or cutting. The system is available in a Raw bare-steel finish and a Powder Coat finish, and in V6 and V8 engine configurations.

Complete Underbody Coverage in Three Bolted Sections

The C4 Fabrication Full Skid Plate System uses three separate plates that bolt together as a unified assembly, spanning from the front of the engine bay rearward through the transfer case. Wide plate coverage keeps vital drivetrain components shielded from rock strikes, ledge impacts, and trail debris that a narrower or single-piece design would leave exposed. Because the plates bolt to one another and to the factory mounting points, the assembly stays rigid under repeated impacts rather than flexing at unsupported gaps between sections.

A dedicated bolt-in crossmember reinforces the transfer case section specifically, the point on a 4th Gen 4Runner that takes the hardest hits when the center of the vehicle drops into a rut or over a ledge. That added structure distributes impact loads across the crossmember rather than concentrating them on the transfer case housing itself.

Maintenance Without Plate Removal

Integrated oil drain and oil filter covers are built into the skid plate design, so routine oil changes do not require unbolting and lowering the entire assembly. On a trail or at a remote campsite, that means a straightforward service interval rather than a full undercarriage teardown. The same bolt-on design that makes installation straightforward also means the plates can be removed and reinstalled cleanly if a deeper service is needed.

Finish and Raw-Steel Notes

The Raw finish ships as bare pickled-and-oiled steel. Bare steel will rust without a protective coating, so painting or powder coating after delivery is required for long-term corrosion resistance. C4 Fabrication recommends test-fitting the plates before sending them out for coating to confirm alignment and fitment on the specific vehicle. The Powder Coat finish arrives ready to install with a durable coated surface. Both finishes are available in V6 and V8 configurations.

Features

• Three-piece bolt-together design: separate plates cover the engine, transmission, and transfer case as one unified assembly
• 3/16" CNC-cut P&O steel: pickled-and-oiled mild steel plate, CNC-cut for consistent fitment
• Bolt-in crossmember: adds structural reinforcement at the transfer case section
• Oil drain and filter covers: allow oil changes without removing the skid plates
• 100% bolt-on installation: no drilling or cutting required; all mounting hardware included
• Made in the USA: manufactured domestically by C4 Fabrication

Specifications

Who This Is For and Isn't

The C4 Fabrication Full Skid Plate System suits 4th Gen Toyota 4Runner owners (2003–2009, V6 or V8) who run technical off-road terrain and need full underbody protection for the engine, transmission, and transfer case. It is compatible with most aftermarket front bumpers and with vehicles running a 1" differential drop, making it a practical choice for moderately built rigs.

The fuel tank skid plate is not included in this system and is sold separately. This kit does not fit 4Runner generations outside the 2003–2009 4th Gen range. Buyers choosing the Raw finish should plan for painting or powder coating before use, as bare P&O steel will corrode without a protective finish.

Common Questions

Does installation require any drilling or cutting?

The C4 Fabrication 4Runner Full Skid Plate System is a 100% bolt-on design. No drilling or cutting of the vehicle is required. All mounting hardware is included, and the three plates bolt together and to factory mounting points.

Does the fuel tank skid plate come with this system?

The fuel tank skid plate is not included in the Full Skid Plate System and is sold separately. This kit covers the engine, transmission, and transfer case; front and rear skid plates are included in the three-piece assembly.

Can I change the oil without removing the skid plates?

Yes. The C4 Fabrication Full Skid Plate System includes integrated oil drain and oil filter covers built into the plate design, allowing routine oil changes to be completed without unbolting or lowering the skid plate assembly.

Will this system work with my aftermarket front bumper or lifted suspension?

The C4 Fabrication Full Skid Plate System is compatible with most aftermarket bumpers and with a 1" differential drop. Compatibility with specific bumper brands or suspension configurations beyond a 1" diff drop is not confirmed; test-fitting before any coating is recommended.

What is the difference between the Raw and Powder Coat finish options?

The Raw finish ships as bare pickled-and-oiled steel and must be painted or powder coated after delivery to prevent rust. C4 Fabrication recommends test-fitting before coating to confirm alignment. The Powder Coat finish arrives with a durable coated surface and is ready to install.