I must say, I have never heard of any big block cracking on the back side of the engine. I had a coolant leak on the back side at one time, and it was the freeze plug leaking. Freeze plug rot from the inside out. Yor would have to drop the tranny to be sure though. Hope it's the plug leaking and not the block. Crash 300-K convert [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 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/