I've spotted a reference for the 9.00 X 14 tire on the 300F as having an OD of 28.68". Assuming no slippage: MPH=(3,000*Pi*28.68*60)/(3.23*12*5280)=79.2 MPH. RPM @ 60 mph=2,273 RPM Axle Ratio to give 60 MPH @ 3,000 RPM: 4.26 One reference says the available ratios ranged from 2.73 to 3.91. From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of jean-yves chouinard Sent: Saturday, August 27, 2011 4:27 PM To: chrysler300@xxxxxxxxxxxxxxx; Thomas Cox Subject: Re: [Chrysler300] Rear End 300F I could be wrong here, but isn't the 300F rear end ratio 3:31 to 1 ? And the 300G ratio 3:23 to 1?? I know , not a huge difference...and I agree with Don , 3000 rpm seems high at just 60mph... Jean-Yves ----- Original Message ----- From: Thomas Cox To: chrysler300@xxxxxxxxxxxxxxx <mailto:chrysler300%40yahoogroups.com> Sent: Thursday, August 25, 2011 8:48 PM Subject: [Chrysler300] Rear End 300F At 60 mph, I am running about 3,000 rpm. Is this to be expected with a 3.23 rear end? I wonder if I have the correct "chunk" in the F rear end. [Non-text portions of this message have been removed] [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 To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to http://autos.groups.yahoo.com/group/Chrysler300/join and select the "Leave Group" button For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylangYahoo! 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: Chrysler300-digest@xxxxxxxxxxxxxxx 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/