Transmission shudder
Driver
Joined: Aug 2019
Posts: 86
Likes: 7
From: NY
Great news. No shudder at all since the pan, filter, and oil were changed (along with adding the lubegard additive). I also reset my ECU so it can relearn the new transmission performance (some transmissions adjust shift timing depending on ATF lubricity and other factors). The only issue I have left is when stepping on the gas quickly after braking at low speeds (1st gear), the engine will rev to 2K RPMs with no power for a sec before finally shifting and putting the power down (almost as if I rev’d while it was in the middle of shifting gears). Anyone else have/notice this behavior?
I’d recommend trying the additive first and then swapping oil and filter if it doesn’t work, that way you save money. I just decided to do all of it at once since I was going to have the pan replaced anyway and didn’t want to have to pay my guy a second time (I’d have added the additive myself first, but it’s been brick out).
UPDATE 9-1-22: Turns out, the issue of the car hesitating when giving it gas from a near stop was due to my rotors! They were so rusted/seized that the transmission computer was getting so confused it couldn't decide which gear to go into. I'd been driving with dragging rotors/brakes the whole time lol. A lot of my transmission complaints probably stemmed from the rotors.
I’d recommend trying the additive first and then swapping oil and filter if it doesn’t work, that way you save money. I just decided to do all of it at once since I was going to have the pan replaced anyway and didn’t want to have to pay my guy a second time (I’d have added the additive myself first, but it’s been brick out).
UPDATE 9-1-22: Turns out, the issue of the car hesitating when giving it gas from a near stop was due to my rotors! They were so rusted/seized that the transmission computer was getting so confused it couldn't decide which gear to go into. I'd been driving with dragging rotors/brakes the whole time lol. A lot of my transmission complaints probably stemmed from the rotors.
Last edited by AmanES300; Sep 1, 2022 at 01:38 PM.
Great news. No shudder at all since the pan, filter, and oil were changed (along with adding the lubegard additive). I also reset my ECU so it can relearn the new transmission performance (some transmissions adjust shift timing depending on ATF lubricity and other factors). The only issue I have left is when stepping on the gas quickly after braking at low speeds (1st gear), the engine will rev to 2K RPMs with no power for a sec before finally shifting and putting the power down (almost as if I rev’d while it was in the middle of shifting gears). Anyone else have/notice this behavior?
I’d recommend trying the additive first and then swapping oil and filter if it doesn’t work, that way you save money. I just decided to do all of it at once since I was going to have the pan replaced anyway and didn’t want to have to pay my guy a second time (I’d have added the additive myself first, but it’s been brick out).
I’d recommend trying the additive first and then swapping oil and filter if it doesn’t work, that way you save money. I just decided to do all of it at once since I was going to have the pan replaced anyway and didn’t want to have to pay my guy a second time (I’d have added the additive myself first, but it’s been brick out).
Driver School Candidate
Joined: Jan 2021
Posts: 24
Likes: 7
From: Kent, UK
Great news. No shudder at all since the pan, filter, and oil were changed (along with adding the lubegard additive). I also reset my ECU so it can relearn the new transmission performance (some transmissions adjust shift timing depending on ATF lubricity and other factors). The only issue I have left is when stepping on the gas quickly after braking at low speeds (1st gear), the engine will rev to 2K RPMs with no power for a sec before finally shifting and putting the power down (almost as if I rev’d while it was in the middle of shifting gears). Anyone else have/notice this behavior?
I’d recommend trying the additive first and then swapping oil and filter if it doesn’t work, that way you save money. I just decided to do all of it at once since I was going to have the pan replaced anyway and didn’t want to have to pay my guy a second time (I’d have added the additive myself first, but it’s been brick out).
I’d recommend trying the additive first and then swapping oil and filter if it doesn’t work, that way you save money. I just decided to do all of it at once since I was going to have the pan replaced anyway and didn’t want to have to pay my guy a second time (I’d have added the additive myself first, but it’s been brick out).
The hesitation you have mentioned had happened to me a few weeks ago, since changing the transmission fluid and filter. My transmission would rev but wouldn't drive. I would have to put it into reverse and back into drive, which would fix it. I assume it's something related to the fluid going around the system as the issue only happens when it's been from a cold start within 1-3 mins of pulling away. It's stopped doing this of late and I'm 99% sure it's related to the fluid drain and refill - because it never did this before.
I've been following your thread recently, so I'm glad to hear you are making progress. I also wanted to know how much of the Lube Gard was added to your transmission fluid? I'm in the process of doing the same to my GS430 in the coming weeks.
The hesitation you have mentioned had happened to me a few weeks ago, since changing the transmission fluid and filter. My transmission would rev but wouldn't drive. I would have to put it into reverse and back into drive, which would fix it. I assume it's something related to the fluid going around the system as the issue only happens when it's been from a cold start within 1-3 mins of pulling away. It's stopped doing this of late and I'm 99% sure it's related to the fluid drain and refill - because it never did this before.
The hesitation you have mentioned had happened to me a few weeks ago, since changing the transmission fluid and filter. My transmission would rev but wouldn't drive. I would have to put it into reverse and back into drive, which would fix it. I assume it's something related to the fluid going around the system as the issue only happens when it's been from a cold start within 1-3 mins of pulling away. It's stopped doing this of late and I'm 99% sure it's related to the fluid drain and refill - because it never did this before.
Driver School Candidate
Joined: Jan 2021
Posts: 24
Likes: 7
From: Kent, UK
The aisin transmission is very sensitive to fluid levels, you more likely have too much or too little fluid in the transmission. Also how was the fluid condition when you first drained it, was it dark with odor? Another possibility is worn clutch plates inside the transmission.
Driver
Joined: Aug 2019
Posts: 86
Likes: 7
From: NY
The aisin transmission is very sensitive to fluid levels, you more likely have too much or too little fluid in the transmission. Also how was the fluid condition when you first drained it, was it dark with odor? Another possibility is worn clutch plates inside the transmission.
10th Gear
Joined: Dec 2021
Posts: 13
Likes: 1
From: CA
I didn't change it myself, a local specialist did. I did ask them to save some of the drained fluid and it was pretty much the same colour as the new fluid - like a cherry red colour. I've had the car less than a year, so I assume the last owner has had the same thing done and sold me the car without telling me the issue!
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10th Gear
Joined: Dec 2021
Posts: 13
Likes: 1
From: CA
I didn't change it myself, a local specialist did. I did ask them to save some of the drained fluid and it was pretty much the same colour as the new fluid - like a cherry red colour. I've had the car less than a year, so I assume the last owner has had the same thing done and sold me the car without telling me the issue!
Driver
Joined: Aug 2019
Posts: 86
Likes: 7
From: NY
Hey everyone. Just did the ATF overfill procedure and it makes a world of difference. The shuddering is still gone, but now the transmission doesn’t hesitate at all. The issue I described at low speeds is no longer there and the car drives likes it’s brand new. The excess fluid seems to add too much fluid resistance than the transmission was designed for. The extra fluid causes something in the transmission to have too much inertia when braking and throws off the shift timing for 1st gear. I’m also fairly sure this actually was reducing my braking performance (extra inertia to deal with) that I could feel. Now when I brake, I can visibly see the RPMs on the engine drop very quickly when the gears shift. The car is also shifting gears faster it seems.
DO THE FLUID LEVELING PROCEDURE EVERYONE.
DO THE FLUID LEVELING PROCEDURE EVERYONE.
Last edited by AmanES300; Jan 8, 2022 at 10:55 AM.
10th Gear
Joined: Dec 2021
Posts: 13
Likes: 1
From: CA
Hey everyone. Just did the ATF overfill procedure and it makes a world of difference. The shuddering is still gone, but now the transmission doesn’t hesitate at all. The issue I described at low speeds is no longer there and the car drives likes it’s brand new. The excess fluid seems to add too much fluid resistance than the transmission was designed for. The extra fluid causes something in the transmission to have too much inertia when braking and throws off the timing for the gear shift 1st gear. I’m also fairly sure this actually was reducing my braking performance (extra inertia to deal with) that I could feel. Now when I brake, I can visibly see the RPMs on the engine drop very quickly when the gears shift. The car is also shifting gears faster it seems.
DO THE FLUID LEVELING PROCEDURE EVERYONE.
DO THE FLUID LEVELING PROCEDURE EVERYONE.
10th Gear
Joined: Dec 2021
Posts: 13
Likes: 1
From: CA
BTW can anyone actually recommend an additive for the transmission they have ran for thousands of miles without any issues on the contrary positive results? I want to consider it but too scared to try it lol
Driver
Joined: Aug 2019
Posts: 86
Likes: 7
From: NY
Nice! I'm glad it worked out. So did u end up using the additive on the last drain and fill or did u just drain and fill with atf? Yes I need to do level procedure on mine too cuz my damm atf overfill allen bolt won't budge. Will be drilling a hole and using a spiral screw extractor to remove it. Wish me luck!🤞
As for the bolt, the part number is 9034110021. You can grab it from either a Toyota or Lexus dealer, but call ahead to make sure they have one in stock. I have a lot of dealers around me but only one actually had it in stock and it was the last one. There’s also a washer that goes with it, part number 3517830010. Same advice here.
10th Gear
Joined: Dec 2021
Posts: 13
Likes: 1
From: CA
Added it on my last fluid change which was when the filter and pan were changed (about 5.5qts of new fluid). I recommend doing the fluid or adding the additive separately first so you can know if the additive fixed it or if the fluid change fixed it. I don’t know on mine since all the work was done at once.
As for the bolt, the part number is 9034110021. You can grab it from either a Toyota or Lexus dealer, but call ahead to make sure they have one in stock. I have a lot of dealers around me but only one actually had it in stock and it was the last one. There’s also a washer that goes with it, part number 3517830010. Same advice here.
As for the bolt, the part number is 9034110021. You can grab it from either a Toyota or Lexus dealer, but call ahead to make sure they have one in stock. I have a lot of dealers around me but only one actually had it in stock and it was the last one. There’s also a washer that goes with it, part number 3517830010. Same advice here.
10th Gear
Joined: Dec 2021
Posts: 13
Likes: 1
From: CA
Added it on my last fluid change which was when the filter and pan were changed (about 5.5qts of new fluid). I recommend doing the fluid or adding the additive separately first so you can know if the additive fixed it or if the fluid change fixed it. I don’t know on mine since all the work was done at once.
As for the bolt, the part number is 9034110021. You can grab it from either a Toyota or Lexus dealer, but call ahead to make sure they have one in stock. I have a lot of dealers around me but only one actually had it in stock and it was the last one. There’s also a washer that goes with it, part number 3517830010. Same advice here.
As for the bolt, the part number is 9034110021. You can grab it from either a Toyota or Lexus dealer, but call ahead to make sure they have one in stock. I have a lot of dealers around me but only one actually had it in stock and it was the last one. There’s also a washer that goes with it, part number 3517830010. Same advice here.