I've had this problem twice in the past, and it was two different issues. The first time it was the ball and trunion U-joint that had failed, and the second time it was the large nut that holds the emergency brake drum on the tail shaft of the transmission. You have to remove the 4 nuts and drop the ball and trunion end of the drive shaft to see the nut that holds the emergency drum onto the tail shaft. Oh, I just remembered a third instance (I've had a lot of these cars in the last 30 years). Also check the 4 bolts that hold the transmission to the bell housing. I had a car that came with a 'rebuilt' cast iron torqueflite, but the bolts must not have been tightened to the correct specification when it was reinstalled, so they backed out a bit and the transmission was literally wobbling on the bell housing. It tore up the drive sleeve and the converter! John -----Original Message----- From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of c300c@xxxxxxx Sent: Friday, June 02, 2006 2:04 PM To: mocarjoe@xxxxxxx; Chrysler300@xxxxxxxxxxxxxxx Subject: Re: *****SPAM***** [Chrysler300] excessive vibration on 300F car. I had this problem in my 1957 300-C conv. and it was not a problem as you outlined. It was the ball and trunion joint at the transmission end of the dr iveshaft. Gary Hagy Hamburg, PA In a message dated 6/2/2006 9:00:26 A.M. Mountain Standard Time, mocarjoe@xxxxxxx writes: For a car to vibrate at only 20 MPH is a serious problem! I'd start by checking every lug nut on every wheel. Loosen then tighten each one, check rear axle nuts and front hubs for missing cotter pins (clue that the nut has loosened). Next jack the car up and try to shake and move the front wheels. Try to shake the tie rods back and forth, rigorously shake all components of the steering system. I doubt a driveline problem unless the drive shaft is bent, but if no front end problem is found, and wheel nuts are ok put the car so both back wheels are off the ground and start the motor and try to recreate the problem without hazarding a drive in it. You might see a broken transmission mount or hear obvious thudding. Good luck. ------------------------ Yahoo! Groups Sponsor --------------------~--> You can search right from your browser? It's easy and it's free. See how. _Click Here!_ (http://us.click.yahoo.com/_7bhrC/NGxNAA/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 [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/ Yahoo! Groups Links ------------------------ Yahoo! Groups Sponsor --------------------~--> Protect your PC from spy ware with award winning anti spy technology. It's free. http://us.click.yahoo.com/97bhrC/LGxNAA/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/