Thread: strange shaking

i've installed a zzp poly trans mount, zzp poly dog bone mounts, and 1.5 inch shorter dog bones. i know to expect more vibration due to the poly mounts but this is different and started about two months after installing these parts. it starts at about 58 and continues to about 67 and is violent enough to shake the whole car pretty bad. its worst at full throttle but it can be felt even just cruising between those speeds. does anybody know what could cause this? could it be that i still have the stock motor mount?

i know it isn't a wheel because it did it with the stock 16's and still does it with the spiffy new 18's. i will check out the cv joint though thanks for the input

figured out what it was if anybody cares. my flex plate was only held in with 2 bolts and they were both loose. now i need a new flex plate and torque converter

what is a flex plate, because my car shakes a lot during those speeds also

ya im curious to know too

it's the flywheel on an automatic. connects the crankshaft to the torque converter. i dont know how common this would be though unless somebody has been in the tranny

definitely get it checked. when i brought my car in it had gotten to the point that the welds on the torque converter had all cracked from the flex plate moving back and forth. went from an 800 dollar job to a 1400 dollar job because of that