Terry, Take the car in for the tires to be balanced with a Hunter Road Force system. This is highly recommended with Coker radials. I did this with Mopsy and it smoothed the ride form 0 to 105. I didn't have the nerve to go faster because of the speed rating of the tires. The Hunter Road Force system mates the soft spots of the tire to the hard spots of the rim and applies up to 4000psi road force to determine where the mismatch lies. You probably will have to look on line who in your vacinity has the machine. 300'ly, ROB KERN ----- Original Message ----- From: pennsy300@xxxxxxx To: chrysler300@xxxxxxxxxxxxxxx Sent: Friday, June 05, 2009 4:45 PM Subject: [Chrysler300] 300D Vibration My 300D convert (with the new Coker radials) has a significant vibration, but only between 45 and 50 mph. Above or below this speed all is just perfect. My question: Is this characteristic typical of tire problems, wheel alignment, or something else? I sure would like to get it fixed. Thanx for whatever help is out there. Terry McTaggart **************Mortgage rates drop to record lows. $200,000 for $1,029/mo Fixed. LendingTree® (http://pr.atwola.com/promoclk/100126575x1222653866x1201461148/aol?redir=http:%2F%2Fwww.lendingtree.com%2Fborrower%2Falliance%2Ffrom.as p%3Fwhereto%3Dpromopagev3%26promo%3D00279%26loan%5Ftype%3D2%26source%3D28895 60%26esourceid%3D2889560%26800num%3D1%2D800%2D289%2D3915%26AdType%3D2) [Non-text portions of this message have been removed] [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 <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> 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/