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IMO a 4.0L is no match for 40" tires. Having 5.13 gears and 35s, I can't imagine what you need to run 40s.
I agree with the 40s...

Ive been absent awhile so forgive me for repeat info but what axles are you turning 5.13s in?

Edit: just scrolled up and saw "Rubicon" I'm assuming Rubi D44s ?
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