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I have a 2012 JKU with a 2 1/2 lift, running 35x12.5x20 inch tires, with AUTO tranny. Currently believe I’m running on the stock 3.73 gears. Would like to install either 4.56 or 4.88 as most driving is Hwy. Looking to see if anyone has a best cost on the gears, and what’s typical for install...

So here’s the deal, as short as I can. One day, Jeep runs perfect. Next morning, start it up and my dash looks like Christmas. ETC, Traction Control, Check Engine and TPMS lights, all on. TPMS, easy fix. FYI - this is 2012 Jeep Wrangler JKU AUTO, w/ 84,000 miles, 2 1/2 lift, on 35x12.5x20 Maxxis...