One problem related to automatic transmission torque converter has been reported for the 2018 Jeep Wrangler. The most recently reported issues are listed below.
Drive train vibration most noticeable between 59 - 64 mph. Vibration in steering wheel, driver and passenger front seats, floor pans. 10/3 - 10/8/18 dealer inspected entire vehicle, balanced, road force tested tires found all within spec and balanced with no indexing required. In addition to extensive road testing, evaluation, the service department temporarily replaced 2018 jlu rubicon wheels/tires with wheels/road friendly tires from other Wrangler model and drive train vibration was still present. Dealer service shop foreman indicated transmission, torque converter or drive shaft out of balance but needed guidance from Chrysler engineering on next steps and proposed resolution. Met with Chrysler engineering at dealership service department 10/22/18 and Chrysler engineer stated it's the tires and after another balance and road force test informed me everything was within specifications and they rotated tires front to back. No changes to problem and vibration still exists. I've had the tires/wheels balanced and road force tested by an independent 3rd party and now twice by the dealership. Vehicle is less than 2 months old and 1300 miles.