Symptoms
Rough or erratic shifts on a truck with 'lifetime' fluid, or towing and hard off-road use.
The fix, step by step
- The 10-speed uses thin Toyota WS fluid and has a strainer, not a serviceable filter.
- An IH8MUD member argues that the lifetime-fill recommendation lets wear metals build up in the valve body.
- Owners do a drain-and-fill or a staged exchange with WS or a WS-compatible fluid, then set the level with the factory temperature-based check procedure.
- If you don't have the procedure and a scan tool to read fluid temperature, have a shop do it.
Tools & part numbers
- Socket set
- fluid pump
- scan tool (Techstream or similar) to read ATF temperature
- Toyota WS or a WS-compatible fluid
- service manual.
Where to buy the parts
ATF WS-type transmission fluidRockAuto ↗Amazon ↗
Transmission strainer/filterRockAuto ↗Amazon ↗
OEM oil pan & strainer diagram (drain/check plugs, gaskets)LexusPartsNow ↗
Hunting a used or discontinued part? Search eBay Motors for Toyota Land Cruiser 300 Series parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.