RyVan Posted October 7, 2019 Share Posted October 7, 2019 Hello! I have a 2008 LGT Wagon 5EAT, which has a driveline vibration. I suspected the u-joints as the issue, and before purchasing a driveshaft I took it into a shop to get their opinion. They recommended I replace the driveshaft. I replaced the driveshaft and the vibration is not as bad as it was before, but it is still there. It will only vibrate with light throttle settings and light engine load. Usually happens when in 4th or 5th going slightly up hill, or when dropping into a higher gear with light acceleration. Feels as if you are driving over a rumble strip, just not as pronounced. I called the shop that diagnosed my car and they are out of ideas. The motor mounts look to be solid and I can't think of what else it may be... and ideas??? I appreciate your help. Thank you in advance. Link to comment Share on other sites More sharing options...
Max Capacity Posted October 7, 2019 Share Posted October 7, 2019 Most of us who have driveshaft/propeller shaft issues, first feel it in the your right elbow as it rest on the center console. When I felt it, I got under my wagon and grabbed the shaft on both sides of the center carrier bearing. I could feel more play in the front shaft. I would guess your next check would be either front axle. It is recommended to keep the OEM axles and rebuild them. They are much better then the gamble of getting a good reman one from a auto parts store. If those are in good shape, the next guess would be internal transmission issues. Good Luck 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
apexi Posted October 8, 2019 Share Posted October 8, 2019 Does it go away if the transmission is shifted into neutral or park? Do your cv axles have green cups next to the transmission? Picture of green cups https://legacygt.com/forums/showthread.php/replace-rebuild-torn-cv-boot-and-axle-108975.html Automatic transmission owners have reported vibration when shifted into drive with aftermarket cv axles, and it supposedly goes away when the car is shifted into neutral or park. Link to comment Share on other sites More sharing options...
DaveWaters Posted October 8, 2019 Share Posted October 8, 2019 What you’re describing sounds a lot like transmission shudder. Like the torque converter is locked up at too low of rpm with a load on it. My car suffers from the this problem. Maybe try this when it happens: When in drive mode, down shift from the steering wheel by one gear as soon as you feel it. When in sport mode what I do is pop my foot off the throttle for a split second and go back to it and this unlocks the TC. Link to comment Share on other sites More sharing options...
RyVan Posted July 30, 2020 Author Share Posted July 30, 2020 Ok, I thought I'd report back after I finally solved the problem. Yes it took some time. The initial diagnosis of the motor mounts was incorrect, and led to some unnecessary part changing. After replacing the driveshaft and rear axle the vibration was still there. Regardless, during vibrations the driveshaft was still bouncing around in the center bearing. I then replaced the pitch stop, as well as transmission mount and the vibration is 99% gone. I attribute that other 1% the way it just is. Hopefully this helps someone! DaveWaters, could this be the cause of your vibrations? My car shuddered when the TQ converter locked up with light load or when lugging. Link to comment Share on other sites More sharing options...
hamyscj Posted January 3, 2022 Share Posted January 3, 2022 Ok, I thought I'd report back after I finally solved the problem. Yes it took some time. The initial diagnosis of the motor mounts was incorrect, and led to some unnecessary part changing. After replacing the driveshaft and rear axle the vibration was still there. Regardless, during vibrations the driveshaft was still bouncing around in the center bearing. I then replaced the pitch stop, as well as transmission mount and the vibration is 99% gone. I attribute that other 1% the way it just is. Hopefully this helps someone! DaveWaters, could this be the cause of your vibrations? My car shuddered when the TQ converter locked up with light load or when lugging.Sorry for the dumass question but what is a pitch stop? I've been in the biz for a long time but never heard that term before. I love learning new things! Sent from my SM-G892A using Tapatalk Link to comment Share on other sites More sharing options...
Infosecdad Posted January 3, 2022 Share Posted January 3, 2022 Pitchstop is the "dog bone" looking brace between the top of the transmission on the firewall. It's supposed to help prevent the engine/tranny from pitching back under heavy acceleration. Link to comment Share on other sites More sharing options...
hamyscj Posted January 30, 2022 Share Posted January 30, 2022 Pitchstop is the "dog bone" looking brace between the top of the transmission on the firewall. It's supposed to help prevent the engine/tranny from pitching back under heavy acceleration.As soon as I saw this mount after removing the intercooler, I knew what a pitch stop was! Thanks for clarifying! Sent from my SM-G892A using Tapatalk Link to comment Share on other sites More sharing options...
JoeInOregon Posted January 30, 2022 Share Posted January 30, 2022 As soon as I saw this mount after removing the intercooler, I knew what a pitch stop was! Thanks for clarifying! Sent from my SM-G892A using TapatalkDoes anyone know if you can replace a pitch stop wile the front end of the car is up on ramps ? Worried about what tension may be on it. Sent from my Pixel 3a using Tapatalk Link to comment Share on other sites More sharing options...
Pleides Posted January 30, 2022 Share Posted January 30, 2022 I replaced my pitch stop in the parking lot at work. It's a pretty simple job. I don't think ramps will affect much of anything. Link to comment Share on other sites More sharing options...
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