What size is the drain plug on a gx470 rear diff?
The drain plug on the GX470 rear differential uses a 24mm hex head. This size is standard for the rear axles on Toyota/Lexus SUVs of this era, and the fill plug typically uses the same size. Use a 24mm socket or wrench to remove and install the plugs, and follow the vehicle’s service manual for torque and oil specifications.
Size confirmation and how to verify
On the 2003–2009 GX470, the common drivetrain configuration uses a 24mm hex-head drain plug for the rear differential. If a plug appears different due to aftermarket parts or year-specific variations, verify with the official service manual for your exact VIN and axle configuration.
To service the rear differential, you’ll need the following tools and materials:
- 24mm socket or wrench for the drain plug
- Torque wrench to apply the correct specification
- Drain pan to catch used gear oil
- Correct gear oil per manual (commonly Dexron VI or 75W-90 GL-5 as specified)
- Replacement crush washer or gasket for the drain plug
- Funnel, shop towels, and gloves
- Jack, jack stands or ramps, and wheel chocks for safe lifting
Using the right tools helps prevent stripping the head and ensures a proper seal when reassembling the drain and fill plugs.
Service steps for draining and refilling
Follow these steps to drain and refill the GX470 rear differential oil while keeping plugs properly torqued and sealed:
- Park on level ground, set the parking brake, and raise the rear of the vehicle safely.
- Remove the fill plug first to ensure you can refill after drainage.
- Place the drain pan beneath the differential, then remove the drain plug and allow the oil to drain completely.
- Let the differential drain until flow slows to a stop, then clean the drain plug and install it with a new crush washer or gasket. Torque to the specification in your manual.
- Fill the differential via the fill plug until oil begins to seep from or just reaches the correct level per the manual.
- Install and torque the fill plug, lower the vehicle, and wipe away any spilled oil.
- Start the engine, run briefly, then check for leaks and recheck the fill level if needed after the oil settles.
These steps help ensure a clean drain and proper refill, reducing the chance of leaks or underfill.
Notes on year, trim, and differential type
Some GX470s with special trims, limited-slip differentials, or aftermarket components may have slight variations in oil type, capacity, or plug specifications. Always consult the official service manual for your exact year and VIN before service, and consider replacing the crush washer at every drain for a reliable seal.
Summary
The GX470 rear differential drain plug is a 24mm hex head, a common size for this vehicle class. Use a 24mm socket, follow the manual for oil type and torque, and verify plug sizes if aftermarket parts are present. A well-planned drain-and-refill routine helps maintain diff health and prevent leaks.
What size socket is my drain plug?
There is no universal drain plug socket size, as it varies by vehicle make and model. Common sizes include metric sizes like 14mm, 15mm, and 17mm, as well as SAE sizes like 3/8" and 9/16". To find the correct size, check your vehicle's owner's manual, but it is recommended to have a set with both SAE and metric sockets to cover the most common sizes.
This video demonstrates how to find the correct size for your oil drain plug: 55s1A Auto: Repair Tips & Secrets Only Mechanics KnowYouTube · Feb 16, 2024
Common sizes
- Metric: 10mm, 14mm, 15mm, 17mm, 19mm, 21mm
- SAE: 3/8 inch, 9/16 inch
- Square drive: Some plugs, especially on gearboxes, may require a square drive, such as an 8mm square socket
What to do
- Check the owner's manual: This is the most reliable way to determine the correct size for your specific vehicle.
- Get a socket set: Purchase a socket set that includes a range of both metric and SAE sizes. This will cover the most common sizes you might encounter.
- Use the right tool: A 6-point socket is often recommended for drain plugs to provide better grip and prevent stripping the plug, especially if it's overtightened.
What size socket is the axle nut on a GX470?
2003-2009 Lexus GX470. Axle Nut Socket Size: M28 mm. Notes: Axle Nut -- M28 x 1.5mm.
How much fluid does a GX470 rear differential hold?
The GX470 rear differential fluid capacity is approximately 3.3 quarts. For this service, use a hypoid gear oil with an API GL-5 rating and a viscosity of SAE 80W-90.
This video shows the process of changing differential and transfer case fluid, including the capacity for the rear differential: 58sBinh-Tuner with KidsYouTube · Dec 6, 2024
- Capacity: 3.3 quarts
- Fluid Type: Hypoid gear oil API GL-5
- Viscosity: SAE 80W-90
What size is the drain plug on a Lexus GX470?
The engine oil drain plug for the GX470 is an M12-1.25 size, meaning it has a metric thread diameter of 12mm with a 1.25mm pitch. It typically requires a 14mm wrench to remove and install.
- Thread size: M12-1.25
- Required wrench size: 14mm
