Bigmac
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The 2.94 1/2 calipers are 6.78 piston area
The 3.146 3/4 calipers are 7.76 piston area
Gm used a 1-1/8 for 1/2 ton or 3/4 ton trucks
Your Jeep came with 2.596 piston calipers with 5.29 piston area and a 15/16 master cylinder for a cj, the tj gets a the same size calipers but a 1” master. I would run what you have, you can always make an adjustment in the system if needed, the 1” should work well, the petal will have some travel, that’s good, and have great pressure, the 2” twin piston wilwoods would be the best choice of the two wilwood offerings, it would decrease petal travel but also loose some pressure, the othe advantage of the willwood is better preformance because the two pistons are spaced better on the pads, the original single piston calipers tend to deform the pads




