http://cgi.ebay.com/ebaymotors/Diesel-engine-1984-5-speed-mercedes-300D-60000-miles_W0QQitemZ8061628711QQcategoryZ33615QQrdZ1QQcmdZViewItem

"Diesel engine [1984 5 speed mercedes 300D 60000 miles"
IMPORTED CAR, MANUAL GEAR,[not shifting] AMOTOR is only 60,000, 718-387-7316 START instantly,as NEW CONDITION ! PAY only after inspected,if you fix The manual TRANS -you can DRIVE AWAY WDB1231301A105125 this have the 2nd MOTOR ! [ engine probably LATER MODEL than 1984 !!! ] if you for any reason NOT IMPRESSED -just walk Away !! i AM genteleman -if you not getting a REAL GOOD DEAL -you are FREE ,no commitment

Almost sounds like a broke/bent/loost shift rod. Too bad it's in NY.