Originally Posted By Morty426
So what is the trigger between getting a "015" vs. a "018" - my 71 340 Challenger is a 4 speed and Bill's 71 cuda 340 is an automatic yet we both have "015" ????


for 1971 E-body 3.23:1 OPEN 8-3/4" rear axle - it looks like it is as simple as small block VS. big block (can't confirm where the 383 2bbl ends up?)

10" brakes = "014" (318 & 340) 741 VS. "016" (383 4bbl, 6bbl, HEMI) 489
&
11" brakes = "015" (318 & 340) 741 VS. "018" (383 4bbl, 6bbl, HEMI) 489