Chrysler used three rearends; 7 1/4, 8 1/4 and 8 3/4. The 7 1/4 was probably the most common, found in pretty much all 6 cyl. cars and in the regular V8 cars. The 65 and some 66 high performance cars still used the 7 1/4 because the 8 3/4 was not available yet. 8 1/4 Was 73-76 with the large...