For 1966-1970 Plymouth and Dodge B-bodies there were three basic rear end assemblies that were available: the 8¼, the 8¾, and the 9¾ Dana 60. It is relatively easy to determine which axle your car currently has and then determine which one it was equipped with from the factory. The small block cars almost always came equipped with an 8 ¼ rear end assembly. The big block cars came with the 8¾ with only the high performance options using the 9¾ Dana that was virtually indestructible.

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