I decided to drain the fluid and change the filter. they told me that they use the OE WS ATF suggested by toyota manual, but its a different brand. I will just drain it, I wont be able to flush the whole system as per toyota recomendation, flush and refill and see if the noise goes away, if not, it might be the pump.Verify the ATF level in your trans. If it is good, verify the shop used the correct ATF. Doubt it is the filter.
I will attempt this procedure tomorrow, how would you know if they use a different ATF? I am a little bit hesitant to trust my truck on this shop now since they install a wrong type of belt into my engine, I just had so many problem after they're maintenance service, unusual noise started to appear on my truck. They service my transfer case fluid, coolant, diff rear and front, and trans.Agree with DEWFPO. You need to go back to the shop and verify that they used the correct fluid and fill procedure - FJ Tranny Fluid fill. I wouldn't drain just the pan and mix in 3 litres of Toyota fluid with an unknown type.
Or maybe the shop simply didn't add enough fluid. They have to follow steps 5 and 6 of the document attached. You can check yourself before going back to them. You need to run a little wire to pins 4 and 13 in the OBDII port. (per the document).
- Start the engine. You'll get disco lights on the dash.
- Shift the gear from Neutral to Drive 3 times and the A/T light will come on. It will go out after 2 seconds and come back on when the tranny is warm enough to check the level. (about 10-15 mins).
- Put in park and don't touch the gear shift. Otherwise you have to start over.
- When the A/T light comes back on use a 5mm hex socket to remove the overflow plug. (Have a pan ready and remember the force you used to remove it so you know how much pressure to use when you put it back on).
- A few drops should come out it means the level is ok.
- If nothing comes out in may be low.
- If a ton comes out let it go until it stops. (They overfilled it).
- Tighten the overflow plug. Just snug - Don't be a gorilla.
You must check the level before the A/t light begins to slowly flash on the dash. The tranny is now to warm and you need to let it cool down and start the procedure from the beginning. But you typically have enough time to do the check before it gets too hot. You can also check the temp with an IR thermometer but make sure you point it close to the bellhousing and not the pan. The pan will be a lot cooler. The bellhousing will give you the 46-56C that you want.