Between George Berg and I we had 3 57's, all in 100,000 to 200,000 mile range on each car. We went thru several water pumps. They are NOT all the same. The ORIGINAL water pump had fewer vanes at different angles. Since the cars revved higher than normal, the original 300C pumps SLOWED the flow of water to absorb more heat (I got 3N572063 with 47,000 original miles and original pump.) TOO fast a flow caused overheating. Somewhere in my notes I have original impeller photos and data. The secret is DO NOT PART with your original pump; have it re-built with same impeller. Other pumps fit because the housing works, but that impeller is unique, I believe, to 300C. The 300D I have no idea. As I remember George's 300D had a different pump, but his had an after market air conditioner, too. Chrysler part numbers blur this. I seem to remember there was a service bulletin on them. L. Andrew Jugle, Elmhurst,IL 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 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/