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(MC length - stock length) *.71 + stock length = 2.5" length.

MC length minus stock length gets me how much MC had to extend the arms from stock to get 3.5" length. I then multiply that difference by .71 as that is the ratio of 2.5" to 3.5". I then add that new extension difference to the stock length to get the 2.5" length.

For example, the lower front control arms from MC are set at 23 1/16" and the factory arms are 22 5/8" for a difference of 7/16". 7/16" times .71 is .31". So adding .31" to the stock 22 5/8" is 22.94" or 22 15/16". :bounce:

Edit: Oh and I need the lengths from center of mounting point to center of mounting point.

If your an engineer or mathematician and see a flaw in this logic please advise.

The MC instructions provide all the data I need for my calculations EXCEPT stock front and rear track bar lengths. That is why I am asking this fine JK community for their help. Thanks.