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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
If you can... get a string and wrap it around the axle tube, measure how long that length of string is (that is the circumference obviously). Circumference=2πr and Diameter=2r. So, Circumference divided by 6.28=the radius, multiply that number by 2 and you got the diameter.