Do GX 460's have transmission problems? Should I run away? (2 Viewers)

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I didn't to my first "flush" till over 80k. At 123K, I just had it flushed again with a full service, including having the pan removed.
Unless there's been a lot of heavy towing with it, personally, I wouldn't worry about it.
Since it was a trade in, I have no way of knowing. It has been to Lexus every 5k since new but no mention of tranny service. It does have tow package but looked like all of the jumper harnesses were still in the packaging in the glove box.
 
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Since it was a trade in, I have no way of knowing. It has been to Lexus every 5k since new but no mention of tranny service. It does have tow package but looked like all of the jumper harnesses were still in the packaging in the glove box.
I purchased mine used 7 years ago with a wee bit over 30k on it.
From what you just posted, again, personally, I think you're golden. If the price and color makes you happy, pull the trigger.
 
I did my first service at nearly 150k. Fluid was dark but not burnt smelling and did not have much metal in it (pretty much zero). I'm almost at 197k and the trans is just fine. I'll be doing a drain and fill soon.

I'd be MUCH more concerned about the coolant flush history than the trans at 80k-100k.
 
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Did my first service at 120k.


Talked with Slee about it and they dont even recommend aux trans coolers.

I dont tow, so it would have just been for big tires.
 
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IMO.. the need for external cooling is more based on your use case and personal OBD temp monitoring. If one can keep temps down through driving technique that is an option but if not the coolers are there to help.

I was thinking about lockup discussion earlier in the thread and IIRC in the past the ECO light illumination correlated heavily with the AT being in lockup as well while driving higher speeds. I know many turn that off but just another visual indicator if you don’t have your OBD monitor connected.
 
This is a forever truck for me so I do a drain and fill every oil change.

I use my rig pretty hard and its way too heavy so my oil change interval is 5k. When I got the truck at 120k it had a transmission fluid service at the Lexus dealership at 60k but I have no idea what that entailed. So I did a 4x drain and fill (62% new fluid) over about 1k miles.

Since then the plan is to continue drain and fills every 5k. I think a lot of you will think this is overkill but since the whole thing holds 12 quarts and I assume 60k is the fluid life, you only ever have about 77% new fluid even with a 5k aggressive drain and fill schedule.

Because I do them so often it only takes about 15 minutes and since I'm convinced the Valvoline is better in this application, it only adds 20 bucks to the oil change cost.

ChatGPT made this graph for me that tracks fluid health. This is after a 4x drain and fill at 120k and models out 5k and 10k drain and fill intervals (assuming 60k fluid life).

There is a way to pull the cooler line and drain 1 qt, then refill 1 qt, then drain 1 qt, then fill 1 quart, until the line runs cherry. However, I'm too scared to do such a change.

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A drain and fill is more time, more money, and less effective than a fluid exchange. It's certainly better than nothing, but the best analogy is taking a shower and putting dirty/sweaty clothes back on when you hop out. You'll still be stinky.

IMO, you're better off to drop the pan, clean it out, and do a full fluid exchange ever 30-40K miles. That way, you get all of the gunk out of the transmission, which a drain and fill does not do. You'll be surprised how much crap is in the bottom of a transmission pan and stuck to the magnets. And, with a full fluid exchange, you only have to mess with topping the transmission off and setting the level every few years, instead of doing it every oil change.

A fluid exchange is quite easy with a Motive PowerFill. And, the pan is not hard to drop with a 10 mm socket, and downright easy to drop if you put a 10 mm socket on a cordless impact.
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