Parts for your 2005 Toyota Mark x-Thrust bearing

2005 Toyota Mark X thrust-bearing: is it relevant, and what to service instead

The 2005 Toyota Mark X (GRX120/121) doesn’t use a clutch thrust-bearing (throwout bearing). Every factory 2005 Mark X was fitted with an electronically controlled automatic transmission (Aisin A650E 5‑speed or A760E 6‑speed) behind the 4GR‑FSE or 3GR‑FSE V6. Those gearboxes use a torque converter, so there’s no manual clutch assembly and therefore no clutch release/thrust bearing to replace.

This conclusion is backed by technical sources: Toyota’s Electronic Parts Catalogue (EPC) for GRX120/121 lists only A650E/A760E automatic transmission assemblies and no clutch release bearing components, Toyota TIS/repair manual coverage for the GRX120/121 drivetrain shows ECT (automatic) systems only for this year, and Aisin literature for the A650E/A760E specifies a torque‑converter automatic, which doesn’t employ a throwout bearing.

Worth noting: the Mark X does have internal thrust elements, but they’re not service items during normal maintenance. The engine’s crankshaft thrust bearings/washers are integrated with the main bearings, and the automatic transmission contains internal thrust bearings and thrust washers. These are inspected or renewed only during a full engine or transmission overhaul, not as routine servicing.

If someone is chasing a “thrust-bearing noise” on a 2005 Mark X, they’re usually hearing something else. Common culprits include accessory drive components, the torque converter, or transmission/engine mounts. A sensible maintenance approach for this model focuses on:

• Automatic transmission fluid: use the exact spec shown on the dipstick/owner’s manual. Most 2005 Mark X units run Toyota ATF WS, some early 5‑speed A650E applications specify T‑IV. Refresh intervals depend on service conditions, but a periodic drain-and-fill helps shift quality and longevity.
• Serpentine belt system: inspect/replace the belt, tensioner, and idler pulleys if there’s chirping or rumble at idle.
• Engine mounts and exhaust shields: perished mounts or loose shields can mimic drivetrain noises.
• Torque converter and flex‑plate: if there’s rattle at idle in gear or shudder on light throttle, professional diagnosis is recommended.

Technical references used: Toyota Electronic Parts Catalogue (GRX120/121, 2004–2009), Toyota TIS Repair Manual sections for GRX120/121 drivetrain (ECT automatic), Aisin A650E/A760E technical specifications.

FAQs

Does a 2005 Toyota Mark X have a clutch thrust-bearing?
No. With its factory Aisin automatic transmissions (A650E/A760E) and torque converter, the Mark X doesn’t run a manual clutch, so there’s no throwout/thrust bearing to service or replace.

Where are “thrust bearings” on this car, then?
Internally. The engine’s crankshaft uses thrust bearings/washers as part of the main bearing set, and the auto transmission has internal thrust bearings and washers. These are only addressed during engine/transmission rebuilds, not regular servicing.

What should be serviced if there’s a noise often blamed on a thrust-bearing?
Start with an ATF condition check and a drain‑and‑fill using the correct Toyota spec, then inspect the serpentine belt, idler and tensioner pulleys, engine mounts, and listen for torque‑converter or flex‑plate noises. A qualified technician can pinpoint the source quickly.