Hello Tom! You might want to check the ball and trunnion pin. This is encompassed within the part of driveshaft that fastens to the e-brake drum with the rubber boot just behind. With the drive shaft disconnected (or out), the forward end of driveshaft can 'articulate'...back, better revealing trunnion pin. Was there 'excessive' hot rodding ever with this F? Not that you've done this, but when I did an excessive number of 3 to 1 kickdowns (from transmission) in my G, I started to eventually, down the 'road', get only slight, but steady vibration at 20 to 25 miles per hour. Make sure, should this be the problem, that the right shop machines these entities (ball & trunnion). Some shops don't do it right. Also, if this is the problem, Jeff Carter from JC Auto may be able to help. I got a new whole drive shaft w/ an excellent ball and trunnion from him! I still do 3 to 1 kickdowns but less than before (chuckling right now). The ball and trunnion could be considered by some, an old Chrysler's 'achillies heel'. Jeff's email address is jcauto@xxxxxxxxxx . His phone # is (425) 672-8324. Hope I was of some help!! Sincerely and 300ly, Brandt H. J. w/a G. Hello Would anyone know what would cause excessive vibration on a 300F.It first started when the car reached 55 miles per hour then would go away when the car would reach 60 to 65 miles per hour.Then today i was headed to a car show and was only going 20 miles per hour and the car started to vibrate so excessivly and violently and then i started to hear a winding sound underneath the car that i was forced to turn around and bring the car back home.Deos the driveshaft have counter weights on it or could it be a universal i checked the rear universal and it is fine but the front one with the rubber boot around it seems a little stiff but is still nice and tight so i am confused.God everything is wrong with this car all i can say is whoever restored this car does not have much knowledge on 300 letter cars! i mean for $62,500.00 the car should have been done right the first time and should have been correct.I thank any and everyone for any help tom. [Non-text portions of this message have been removed] To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ SPONSORED LINKS Chrysler 300 series 300 series Chrysler sebring Chrysler town country --------------------------------- YAHOO! GROUPS LINKS Visit your group "Chrysler300" on the web. To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. --------------------------------- --------------------------------- Feel free to call! Free PC-to-PC calls. Low rates on PC-to-Phone. Get Yahoo! Messenger with Voice [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> Home is just a click away.? Make Yahoo! your home page now. http://us.click.yahoo.com/DHchtC/3FxNAA/yQLSAA/8LmulB/TM --------------------------------------------------------------------~-> To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/