Maintenance

Transmission

A750F 5 Speed Automatic Transmission uses 11.5 quarts of Toyota ATF - WS fluid. Although claimed as a lifetime fluid many owners recommend changing the fluid. There are other fluid that are compatible with Toyota WS. http://www.amsoil.com/lookup/auto-and-light-truck/2005/lexus/gx470/4-7l-8-cyl-engine-code-2uz-fe-e/us-volume/

This is a detailed how to for the procedure to change the ATF fluid. https://forum.ih8mud.com/threads/ws-atf-flush-procedure.447398/

Parts

Description Part No.
Transmission Pan Gasket 35168-60010
Transmission Filter/Strainer 35330-60050
Transmission Filter O-Ring 90301-31014
Drain/Fill Plug Gasket 35178-30010 (2 Required)

Common Problems

Rear air bags (suspension)

The rear air bags will eventually fail. A coil conversion is the most common fix, as it's better for off-road purposes and also cheaper than replacing the OEM air bags.

Secondary Air Pump

2005+ only: Congratulations - you have 35hp more than your earlier brethren! Unfortunately, this comes with some emissions complexity, namely an air pump that requires intake manifold removal to repair or remove. This does not impact driveability at all, just cold-start emissions.


CD Changer

CD changers sometimes fail, though with a pre-07 you don't have MP3 capability anyway so you might as well throw it out and install a bluetooth/aux adapter instead. VAIS and GROM both make plug and play units.

Rear Interior Door Handle

The inside rear door handle breaks on basically everybody's GX. You can get a new one online from Lexus for about 20 bucks, or fashion/buy something else out of paracord, nylon webbing, etc. If you buy one from Lexus, use your VIN to look the part up so you get the right color.

2003-2005 Diff Support

The passenger side front differential support was revised for 2006. If you have a 2003 to early 2005, you will want to install the updated front differential support from Lexus. Sme 2005 GX’s have the updated part from the factory. Failure to do so may result in the differential support catastrophically failing, which is a really bad day for anything close to the differential (i.e. your oil pan, and consequently your motor). Toyota Part for ordering is#52380-60021: Support, Front Differential, NO.2 However the number stamped into the side of the part is 52391-60021.

8" Rear End

The factory 8” rear end is known to be weak. If you wheel enough, it’ll probably break. On the bright side, this gives you an excuse to re-gear and add lockers!




GX 460 General Vehicle Maintenance



460 - brake bleeding with Techstream
460 - brake fluid flush
460 - brake pads (rear) replacement / [Rear pads] “New” thickness: 10.0 mm (0.394 in.) / Minimum thickness: 1.0 mm (0.0394 in.) / [Rear Brake Rotors] “New” thickness: 18.0 mm (0.709 in.) Minimum thickness: 16.0 mm (0.630 in.)
460 - cabin air filter replacement
460 - coolant flush
460 - chassis lubrication / zerks - propeller shaft / spiders & slide yoke
460 - differential and transfer case fluid changes
460 - EGR valve replacement
460 - '10-'13 FSM (useful on '14+ as well)
460 - fuel filter replacement (North American models just use the sock off the fuel pump)
460 - fuel pump replacement
460 - headlight aiming
460 - HVAC/heater/air conditioning diagnostics
460 - oil/filter change
460 - PCV valve replacement
460 - radiator replacement
460 - replace stock plastic oil filter cap with metal version
460 - reverse light replacement
460 - service specification sheet
460 - spark plug replacement
460 - starter replacement
460 - transmission drain and refill
460 - V-belt replacement
460 - wiper blades (front) replacement
460 - wiper blade (rear) replacement