Yep...KINGMOPAR is dead on....  I'm looking at the '73 service manual as I type this and just walked back up from the shop where there is an original '73 Sport sitting on jackstands.......they're forward mounted...and the setup is as he describes above. I've been tempted on my '72 Swinger to convert it completely to the '73 setup, but haven't done it....yet.
'73 Dart Sport 408 stroker, Auto, 3.55 Suregrip
'72 Swinger 440, Auto, 3.55 Suregrip
'72 Demon 340 4-speed, 3.55 Suregrip
'67 Charger 440, Auto, 3.55 Suregrip
'03 Ram 3500 CTD, Auto
'11 Challenger SRT-8, 6-speed Manual
'12 Ram 1500 Crew Cab, 4WD, Laramie
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