Quote:
Originally Posted by Steve Stasko
A lot of '74 and up A-bodies had disc brakes with the large bolt pattern. This stuff would be a direct swap.
Some people will tell you they made the change in '73, but I had a '73 Dart Swinger, 225/auto that had small bolt pattern discs, with left handed studs too on the driver's side. I was pretty disappointed when I popped the hubcaps off on that one. It was one of those factory oddballs I guess. '73 was supposed to have the 4.5" bolt pattern, along with the right handed studs.
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I'll bet your Dart was a very early production model and Chrysler used left over pieces on it. Lots of rumors to using up parts that way. I bought an early '72 Challenger in '73 with a forged crank and 2.02" valves! I don't recall what compression the pistons were or the block casting date. Everything appeared original.
It's my understanding that while Mopar did go to the 4.5" bolt pattern in 1973, it was
only with the disc brake option. The cars with drums all around, usually the /6 models, stayed with the 4" pattern. I'm not sure if the ever changed to 4.5" on the drums by '76, the last year of the A-bodies. Seems like I heard something about it but can't confirm.