Common Issues with the Toyota U660E Transmission 

Proper use of transmission fluid today is critical especially in Toyota. To deviate from the correct fluid can cause short-term drivability or long-term durability issues. It is best to verify and use the correct fluid.

Ams oil is best I’ve been using amsoil since 80k miles religiously change oil including trans fluid it’s a 2007 with 170 now engine purs trans is smooth I used to use ws fluid but they use the minimum additive in there fluid jus cuz it factory don’t mean it’s the best u can get

There are several valves in a U660E valve body. It would be best to refer to a tech service for an exploded view of the valve body to locate the valve in question and its function.

U660e has better reliability

You sure it’s not a bad motor mount? Try putting it into that gear manually and then mash the gas pedal, if it still slams than it’s your motor mount.

@@ChristopherGuilday it would be a relief if it was only a motor mount, but there is no vibrations when i start the car or turn it off, tried the manual mode and i only get that slam when, for example, i downshift from second to first gear

My 2015 Sienna with only 5,000 miles has this transmission. Had that whine since new, the case is not causing the whine. I don't think it's the transmission at all. I've heard it's exhaust resonating and that weights stop it, but it's harmless... IDK to me it always sounded like a power steering with low fluid.. But my Sienna doesn't have a ps pump, does you Avalon?

I doubt you'll ever have a problem, the Avalon is fairly light. The Sienna is a pig, my weighs 4,700 lbs.

Following the maintenance steps found in the vehicle owner's manual is typically the best approach to keeping the transmission functioning properly throughout its service life.

Thanks for the reply I will be looking for an rx350 2015 model year defiantly looking for one with around 50-60 thousand miles on it first thing I will do is change the transmission fluid. I've always had OCD with changing transmission fluid because that's how you get the life out of them. The main problem with buying one with 80-90 thousand is most people don't change the fluid and then you stuck with there issues. Love Toyota & Lexus I've owned two Camry and three different models for Lexus, thew one thing I do not understand is if they had this TRANMISSION in production from around 2006 past 2015 you would think they would have worked out all the problems with this transmission, not that its problematic but, usually there really good with correcting problems over time, come on Toyota bring your A Game. I am very surprised that the rx 2010-2015 last so long because it sucha heavy vehicle to pull and you have all that strain on the transmission. I guess its not like the is or gs were you have significant more horsepower and torque. @@bobbymace5715

@@joshuapressley4441 You should consider the audience that Mike's addressing in the video. He's discussing the issues that technicians encounter once a transmission has failed. In most cases, whether it happens at 75,000 miles or 275,000 miles, the failure will take place due to one or a small handful of parts that fail. Mike is telling the techs to look for the most commonly encountered failure points and isn't discussing the overall quality or lack of quality for the transmission.

@@bobbymace5715 bro who the hell is your problem. Are you the moderator of this channel. I can post whatever I want it’s free country KEN.

@@joshuapressley4441 I certainly didn't mean to offend you in any way. I am the publisher of Transmission Digest, the media brand that published Mike's video. My reply was an effort to put his video in context ... these are common issues with transmissions that have been taken into repair facilities. Our best regards to you.

The bearing to case bore wear issue is a torque capacity problem involving the basic design of the transmission. The harder that the vehicle is driven the more likelihood bore wear will occur. To my knowledge, there has not been any type of reinforcement by the OE or aftermarket to eliminate this issue.

@@TransmissionDigest From what I've read so far, the bearing to case bore wear seems much more prevalent on the V6 models vs the less torquey 2ar fe inline four engines. Is that correct?

​@@Shade_Tree_Mechanicwouldn't the weight of the vehicle be more of a factor like the pig of a Sienna that weighs 4,600 lbs?