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I would agree if it was as complicated as shown in video for 460 but IMO it simply is not for our specific vehicle model. The FWD models seem to be a whole other level if following factory methods. Many others here on this forum have changed their AT fluid in their 460s as well.
I am only referring the A760F transmission on the GX 460.
- There is no plastic straw on 460 AT pan as it is built into the pan
- That adjustable level tool he shows in video is probably useful for a shop where a vehicle comes in hot and they don't want to wait for it cool down. I've never seen any shadetree mechanics use anything like that because you generally have the opportunity to change fluid starting out from a cool drain and fill.
- Even latest OEM Factory Service Manual I have that covers through 2021 doesn't show any vacuum based level adjustment
I also don't leverage that built in drive indicator temp gauge. OBD Fusion or Techstream can give you the exact temp of the AT fluid to do the check level drain at.
I think AT Fluid replacement is another vehicle maintenance point there will always be debate but I am very comfortable myself changing fluid in this vehicle. I plan to do single drain and fills at 30k intervals going forward. I have seen a number of AT failures on 460s above 150k miles on other forums and GXOR as well. Nothing on a large scale but noteworthy.
Whether this is due to the increased heat the stock 460 US models without coolers run at, fluke mechanical, or degraded fluid is anyones guess. I also added an AT cooler to help mitigate the higher temps.
60k miles suggested has been in Warranty Services Guide since 2003 model year. Granted they say special operating conditions but this can be even carrying any cargo on your roof.
This is such a small community of GX and Lexus owners on this forum.
The GX transmission runs HOT and if you want a long life out of it, the fluid needs to be changed even more than every 60k miles.
Any new updates from the OP of this topic?
Still waiting to hear from the dealer. I have a very good case with good evidence if things go south. I am not naming the dealer for the time being to give them time to resolve the issue. There are some plusses as well.
1. They contacted me the very next day prior to me contacting them, regarding the transmission.
2. They did not gaslight me and tell me that it was "normal", they confirmed that there is a problem with the shifting.
3. The vehicle is equipped with a camera, with drive footage prior, and after the service was done, after the service, shifts at 15-20 MPH became the equivalent of driving over railroad tracks as far as the cameras G-Sensor is concerned.
I have a 2014 GX460 with 315k miles. I had some slip in the tranny that was probably my fault as I ran over a piece of concrete and had to drive some distance before being able to seal it off and get it to a shop. I think that induced some premature wear and eventual problem. I say this as my last had almost 400k before I traded and never a problem with the transmission. I took it to a shop which has a good reputation and he said it was in need of a rebuild. Thousands later and it drive away and made about a 200 mile drive and during had this high speed vibration that caused a hum in the car. Called the shop and they had me bring back to check it the next day. The found that the driveshafts were installed backwards. Swapped ends on both and I left. Vibration was less but still evident. Have had it back to them several times and they keep telling me the transmission is working fine and it has to be coming from somewhere else like the tires. Tires are under 10k miles and recently balanced so no, not the tires. Took it to my regular car guy and found both driveshafts had wear at the joints where the smaller section slips into the larger. Mechanic said probably due to driving at highway speed with the shafts in wrong. It did diminish the vibration but not all.Still not figuring out all the vibration. Wanted to ask those on here who are probably more in the know if this sherlock homes move seems viable. If we put the car on the lift and disconnect one of the driveshafts from the transfer case and then run the car up to highway speed while on the lift to see if the vibration still exists will that harm anything? If vibration still there then bolt that shaft back on and repeat with second shaft. If vibration goes away on either share we know its downstream of the transferase. If vibration exists no matter which shaft is disconnected then it has to be in the transmission or transferase, right? The vibration is high speed, not like a tire which oh by the way the tire store replaced with a new set after the transmission guy said they were out of round and causing the vibration. Nope, new set and still there.
So does anyone have any insight or advise on the test I laid out above? Good idea, bad idea? Its driving me crazy as the car is in otherwise great shape and I expect to get 500k on this one. Any advise would be appreciated. Thank you
If the slip yoke on the drive shaft was separated that could be the problem. Make sure the drive shaft yoke is phased correctly, the saddles on each end of the driveshaft must align.
Last edited by IanG; 12-22-21 at 07:45 PM.
Reason: added picture
The rear driveshaft appears to be correct in that the two knuckles look like they are aligned. The front appears to be a little out of alignment, not 90 degrees like the phasing diagram but maybe 20 degrees. Wondering if that could contribute or be the cause of the vibration.
Thank you for your input. I am am grateful for the guidance.
The rear driveshaft appears to be correct in that the two knuckles look like they are aligned. The front appears to be a little out of alignment, not 90 degrees like the phasing diagram but maybe 20 degrees. Wondering if that could contribute or be the cause of the vibration.
Thank you for your input. I am am grateful for the guidance.
Yes that is probably your problem. The U-joints have to aligned exactly as pictured, being a spline or two out will vibrate more than being 90 deg out of phase
Has anyone had an issue with a 2011 GX 460 not going into overdrive? My rpm’s are running high. If I pull over and kill the engine and restart it works fine. Check engine light is on and the 4 Low light is blinking but it obviously isn’t in 4 low.
This is sad for me to say and extremely frustrating.
i found a “gently” used 2012 gx460 100k miles, this past weekend at a nearby reputable (non Lexus dealership). It had been serviced at every interval and maintained the best that I could see. It was traded for a brand new BMW.
less than 48 hours ownership and I had these three lights pop up this morning on my way into work. CEL, Traction Off, 4Lo was blinking.
shifting was fine, it did flutter a little at idle.
Took it back to the dealership and they put me in a loaner and are taking it to Lexus to be diagnosed and fixed.
Now then, I ran the codes myself and this is what popped up P2714 and P0761, as well as a few other redundants.
As I wait impatiently to hear the fate of this vehicle that I’ve fallen in love with already, Could this really be just 2 faulty solenoids? It’s a sealed transmission, so what am I really looking at?
This can’t be a bad tranny, I know what a bad tranny drives like.
Latest word is nothing..I am friends with a service writer at the local Lex dealership and gave him a call. Said they came to pick it up and I haven’t heard anything. I’m assuming they are trying to figure out what to do.
09-29-21, 03:26 AM
