WICKED vibration at 80+MPH
Staging Lane
Joined: Oct 2005
Posts: 96
Likes: 0
From: San Tan Valley, AZ
i also have the vibration, had it with stock rubber mounts, energy suspension mounts, even had the stock steel driveshaft balanced with new joints. I then bought a low mileage ls1 aluminum driveshaft and the vibration decreased but still there. My next items to investigate are the trans tailshaft bushing and the rear end bearings. I however think that the vibration is the rear end pinion bearing that will probably have piting and or grooves causing an uneven mating surface.
Try changing the transmission mount. I had the same exact problem, bought a new driveshaft and it was still there, changed back to the stock tranny mount and its perfect now. I could accelerate hard up to about 65-70 mph and it would feel like the car was falling apart, push in the clutch and it seemed like it would get worse. Pull the mount and put in a stocker for ~$18 at least then you would have a better idea if its the tranny or not.
stuck rubber bushings everywhere else?
im willing to bet, just like my car, those bushings are a little bit worn out. i also recently put a polyurethane trans mount in my car, and as soon as i did it started vibrating. think about all the play it had before when it was rubber, it could move with the rest a little bit, that poly mount took all that play out, hence the vibrations.
i am changing back to a stock Rubber style mount ASAP, at least until i upgrade the rest of my mounts/bushings to poly. i thought maybe after i had installed mine, maybe a weight fell off the driveshaft, so i bought an aluminum one, which slightly helped with the vibrations, but did not help that much.
im willing to bet, just like my car, those bushings are a little bit worn out. i also recently put a polyurethane trans mount in my car, and as soon as i did it started vibrating. think about all the play it had before when it was rubber, it could move with the rest a little bit, that poly mount took all that play out, hence the vibrations.
i am changing back to a stock Rubber style mount ASAP, at least until i upgrade the rest of my mounts/bushings to poly. i thought maybe after i had installed mine, maybe a weight fell off the driveshaft, so i bought an aluminum one, which slightly helped with the vibrations, but did not help that much.
