According to Allpar, ''37 vs '38: "The previous years' frame, boxed front and rear with a heavy X-brace as before, now had an oval center housing welded and riveted to the X-brace through which the drive shaft passed." Original is at Plymouth cars of 1938 http://www.allpar.com/history/plymouth/1938.html#ixzz2LPRnM11Q Follow us: @allparcom on Twitter | allparcom on Facebook