Hey DFX replying late to this one but is that for sure that only 4 speed cars got torque boxes? My 72 automatic has on all 4 corners and I said the 70 340 4 speed car has on front but might be on all 4 as well. Do we know if they split up with only 2 on the front or 2 on the back? I have seen a couple with only 2.
How about 340 Dusters and Demons (didn't check or ask) - I've only seen them on 340 equipped Swingers.