gr8fulRed

how much did Lexus charge to replace the internal transmission filter?? I believe I've seen a DIY on here somewhere. I may tackle that myself on my next fluid change out.

mikemcc122

01 GS430 with 226K miles, shifts smooth. Several transmission fluid exchanges (drain and fill method) with the appropriate dealer T-IV fluid.

Bambam40

My GS300 (2006) has covered 141000 miles and has the same issue. Have had the trans oil changed but it hasn't helped. Wont go above 3rd gear and if you try to use the cruise it "hunts" up and down the rev range and cant hold the speed constant. Love the car but the cost of replacing or rebuilding the tranny (solenoid changes) are going to mean the death of an otherwise superb car.

jacklex

My dealer Lexus, said I needed to change my 450h transfluid which is lifetime in the CV transmission. I also use my (now became a friend) Toyota dealership for oilchanges and other maintenance issues on the Lexus' I've owned (and toyotas too) and the service writer said NOT to change it because it's lifetime. I've got about 146k on the 450h and it runs like new. what is the consensus on trans fluid changed in the CV trannys?

olocks1

I have a 2015 GS350 AWD Base Model, I have 54,000 miles on my car and the transmission is starting to act up, when driving at low speed from 20-40mph you get a stutter 3 times like you hit 3 speedbumps. after 40mph the car is fine, the shutter or stutter happens at low speeds and when accelerating smooth, if your aggressive on the gas pedal then you will never feel it. My car is at Lexus dealer for the 3rd time in a one month time span, when I google this issue I get Torque Converter failure.

gs350fan

Not failure necessarily but the fluid is starting to lose its friction modifiers. 60K ish sounds right, depends on many factors. I would get a fluid service at this point. You may be under warranty as well. I described what happens in other posts, but these cars allow some slip when the torque converter locks up. Maybe 4-5 rpm, but not a total lockup. This also generates heat.The slipping has to be smooth (the friction modifiers in the fluid must work right) otherwise you get that slip and shudder. Similar also to a limited slip rear axle.

Was a very common problem with Fords, fixed with new fluid and sometimes a good cooler.

I believe from what I read these cars are undercooled for the trans. These identical transmissions are used on the big Toyota trucks and they have a special thermostatically controlled cooling system.

jRingo

I'm confused...can this affect every 3rd gen GS model or just AWD GS models?

If it's every I guess I'll definitely be looking at 4th gens.

DallasGSF

I currently have the same problem at 180k. How did you fix the issue?

tghw

Same trans/ same issues with the G4s if not serviced. See post #80.

jRingo

Okay, so this entire issue is from people not keeping up on maintenance? It's not some luck of the draw issue?

goodbadboy

I am having issue with my 2006 GS300 AWD. Whenever I am slowing down & speed is less than 10MPH car gives sudden Jerk & also when I am accelerating at ~40MPH it gives another little jerk.I took it to Lexus Dealer & said transmission needs to be replaced I read on the forums that chaining the transmission fluid ,Solenoids might help.Any one did it & did it resolve the issue? or is there any other fix

Brabusx2

same issue, only happen on hot weather tho, i always thought it would be the engine cam gear... but sound like its about the end of time for my GSh

verly6565

you are suppose to drain and fill 3 -4 time until fluid is red again never flush on hi millage

XJSFan

Now have 40K miles on my 2006 GS430 and the tranny is very smooth. Had a slight transmission gasket leak at 28K miles(5 years ago) but had gasket replaced and no leaks since. Great car...

olocks1

Hey Guys forgot to update you with what happened, Lexus Determined that the torque convertor was bad , in that situation they replace the entire transmisson bc the torque convertor is part of the transmisson as a whole unit. since they replaced the tranny , my car is super smooth and problem solved.