YOUR CAR CAME WITH A 3.07/1 RATIO REAR END.
THE ONLY LOWER RATIO EVE OFFERED FOR YOUR CAR
WAS 2.88/1. THE RATIO WAS OFFERED IN 1985
ON 300DT/300TDT/300CDT. IF YOU REPLACE THE REAR END YOU WILL NEED TO REPLACE THE SPEEDOMETER OTHERWISE YOU WILL BE GOING ABOUT
7/12 MPH TOO FAST.