Hello2004 ES330 200 000 kmI have a problem with my transaxle. Not every time, but when it passe from 3 to 4 speed, the transaxle make strange feed back. Like if it do 1-2-3-3-4-5. When it want to shift 4, the transaxle pass from 3 to neutral,to 3 (its a feeling) to return to neutral and shift 4 in maybe 1 sec. I have change the ecu for a 2005 and an ecu update, no change. Reset ecu no change. Oil is ok ! I think try a Shift Kit form Sonnax. Anybody have try this ?
https://www.sonnax.com/parts/3048-zip-kit

 

How do you know? When was the last time the transmission oil was changed?

 

I have biy the car 2 years ago and I have not change the oil but i'm mecanicien at Toyota Dealer and I have check it when I had remobe the T/A Oil pan since 2-3 month ago. Color is nice, odor too and for 200 000km the magnet was nice!