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The 926-993 Differential Cover Rear: What It Does and When You Need One

The rear differential cover on a 1995-2004 Toyota Tacoma or 1996-2002 4Runner takes a beating. Road salt, coastal air, and years of heat cycles rust the factory steel cover until it weeps gear oil down your axle. The 926-993 Differential Cover Rear is a direct replacement built for exactly this job.

This cover matches the factory piece in shape and dimensions, so it welds onto the stock housing without modification. You get a fresh sealing surface, renewed protection for your gears and lubricant, and a repair that costs far less than replacing the whole differential assembly.

Fitment and Specifications

Match your model and year before ordering. This part covers two Toyota platforms across specific year ranges:

If the cover currently on your axle carries one of those OEM numbers, the 926-993 replaces it. Matching the stamped number is the fastest way to order the right part the first time.

Why These Covers Fail

Toyota sealed the rear differential on these trucks with a welded steel cover instead of a bolted, gasketed one. That design keeps oil in and dirt out, but once the cover itself corrodes, the only repair path is cutting off the old cover and welding on a new one.

Rust is the main killer. Trucks driven on salted winter roads or parked near the coast show pitting around the cover seam first, then an oily film, then a steady drip. Road debris and off-road hits account for the rest of the failures.

Key Features of the 926-993

Direct weld-on design

The cover is engineered as a direct weld-on replacement for your original equipment. It matches the exact specifications and dimensions of the factory cover on your Tacoma or 4Runner, so it seats and seals without cutting, stretching, or adapting anything.

Fresh corrosion protection

Every replacement ships as new steel with a clean, corrosion-resistant surface. You are trading a rusted-through panel for a fresh one, which is the entire point of the repair.

Real cost savings

Swapping an entire differential assembly costs multiples of what a cover replacement costs. If the gears and bearings inside your housing are healthy, replacing only the cover is the economical fix that extends the life of the truck.

Factory Cover vs. 926-993 Replacement

Installation Overview

Welding is required, so professional installation is the recommendation. Experienced DIY fabricators do tackle this job, but the seal depends on precise alignment and a clean weld. A poor weld means a slow leak and a redo.

The procedure runs five steps:

1. Remove the old, corroded differential cover.
2. Prepare the differential housing surface.
3. Align and weld the new cover in place.
4. Apply the appropriate sealant.
5. Refill with differential fluid.

Torque discipline

Wherever torque applies, over-torquing warps metal and leads to leaks, while under-torquing leaves the seal inadequate. Use a calibrated torque wrench and the correct factory torque values for your vehicle.

Signs Your Differential Cover Needs Replacing

• Visible corrosion or flaking rust on the cover surface or seam.
• Oil film or active drips around the differential.
• Dents or cracks from road debris.
• Low fluid found during a service check.

Glance at the cover every time you change your engine oil. Catching pitting early turns this into a planned weekend repair instead of a trail-side problem.

Care After Installation

Check for leaks at your next few oil changes and watch for new corrosion around the seam. Keep the fluid on Toyota's maintenance schedule — typically every 30,000-60,000 miles depending on driving conditions — because fresh fluid is what protects the gears your new cover exists to enclose.

Related Parts and Guides

Need a second page for the same part, or want it saved in a separate order? We also stock this cover on an alternate product page for the 926-993 Differential Cover Rear.

While the axle is serviced, it is a smart window for other checks. If your truck has also been hard-starting or running rough, a failing camshaft position sensor is a common culprit — our camshaft position sensor for Lexus GS300, GS430, LS430, Toyota Tacoma, 4Runner, and Hiace covers those applications.

Build the whole order in one place

Seals, bearings, gears, or anything else driveline-related for the same job — browse the full Transmission & Drivetrain Parts catalog and ship everything together.

Keep reading

Refreshing an older 4Runner end to end? Our walkthrough of the Toyota 4Runner catalytic converter replacement for 2003-2009 4.0L engines covers that job in the same plain-spoken detail.

Questions Before You Order?

Not sure the 926-993 matches your housing? Send the stamped number or a photo of your old cover through the request-for-quote page, write to support@koeep.com, or message us on WhatsApp. We reply with fitment guidance based on the numbers on your part.

Frequently Asked Questions