I'm about 850 miles into my Lexus GX550 journey and every morning when I leave my house I have a hard shift from 1st to 2nd gear, and a few times throughout the rest of my drive. It also downshifts quite aggressively when coasting and jerks the vehicle. Not what I expected for a new luxury SUV. I've read that this is normal in some IS powertrains and was wondering if that's just how Lexus is or if I should get it looked into. Otherwise the GX is wonderful. I'm just surprised.
GX550 transmission already a bit clunky?
- Thread starter Bmose
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Always be on the safe side get it checked
Hello please check that you are not in tow mode. that is how the tran acts with no load on it with the haul/tow mode turned on.
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After 1,140 miles, mine does not do that at all. Also no hood shake or vibration and I think sound attenuation is great— love my Overtrail + !!!That’s gr
thats great news! I’m never that lucky
That’s great to hear. Already 1100 miles!
Man I can’t wait for ours to arrive.
Summer road trips coming at ya.
My wife had a similar issue in her Mercedes and it was due to the adaptive transmission “learning” a bad shifting pattern. A quick google seems to show Lexus uses something similar. Bring it by the dealer, they can do a software reset and that might fix it.
Let us know what you find! Did you check the transmission fluid levels by any chance?
I noticed a hard shift from 1st to 2nd the 2nd day after delivery, since then the transmission has been surprisingly smooth. When I put the driving mode in sport the transmission has performed just fine. You should expect the same performance, your dealer should be able to solve the issue.
Good luck!
So far my tran. is smooth but there is a downshift that almost feels like braking but my experience is favorable.
It’s ten speed manners. If you never had a ten speed it might be a little jarring. The tune on these trans can’t always predict every scenario, no matter how good their algorithms are. You will evidently experience some sort of gear hunting or judder from time to time.
Good to know ty
Our OT is a little rougher when cold at very light throttle. Seems to be better after wormed up and driven with a bit of input. As noted above, the system knows you plan to hit third gear when you are in the throttle a little. If very light it may hesitate a bit or second guess after going into third. Was thinking the same thing, but will let it play out for a year or so and see if it's something unusual. Otherwise shifts like a dream and holds gear nicely off throttle to compression break a bit/maintain speeds. A prior car wanted to shift to the highest gear as soon as it could which was annoying. A friend with a Tahoe has complained about this constant top gear hunt with his 10spd auto. I don't notice the GX hardly shifting after 4th gear. It's been a pleasure.
I noticed some of this early on, but at 3k miles I really don't see any of the stuttering at low speeds anymore. Might be partially that I'm more familiar with the vehicle and drive it better, but I also think it has "learned" better shift manners.
