CaseyCuda,
Here is a list of torsion bar specs that I found a while back on another web page. All I did was copy it to this form. Mopar muscle magazine had an article on how to identify torsion bars. The article refered to pg46? for decoding the torsion bar end numbers I'm not sure if they were refering to the mechanics/shop manual or what?
Good luck, I hope this helps
Tirekickertoo
Torsion bars
This is a list of the available torsion bars for the Challenger. Which bar you got depended on engine and if the car came with heavy duty suspension or not.
All E-body cars came with a 41 inch long bar (same as B-Body).
Diameter of the bar is listed in inches.
225 six =0.86
318 1970 = 0.88
1971- 1974 = 0.86
HD 1970-1974 = 0.90
340 1970-71 = 0.90
1972-1973 = 0.86
HD 1970 - 1973 = 0.90
360 1974 = 0.86
HD 1974 = 0.90
383-2bbl 1970-1971 = 0.86
HD 1970-1971 = 0.90
383-4bbl = 0.90
440 1970 = 0.92
1971 = 0.90
426 Hemi 1970-1971 = 0.92