4.0 on 33's, 3spd auto, 4.56 gears. Jeep has "trouble" going past 60-65 mph. If I do manage to get to that speed, i'm roughly sitting at 3100-3300 rpms. The jeep also makes a sort of "whining" noise whenever i'm at around 50 mph and start putting 45%-65% pedal pressure to start increasing the speed to the 60's. I have a pretty decent diagnostic tablet I can use to look at the live data, and I believe the torque converter may not be locking up. There is a data point in there that is named "Torque converter desired position" and my result always seems to be "Unlocked". That doesn't seem right. Also my rpms will sometimes bounce down to 2900 at the speeds I previously described, before jumping back to the original cruising rpms it was just at (I don't necessarily feel this drop in rpm while driving, no lurching forward from sudden cut of rpm, speed seems to stay the same). The transmission seems like it never wants to downshift also. I can be going 50 mph and hit an uphill slope, causing my speed to decrease to the low 40's, I mash the pedal to 80-100% pressure and the trans just does not want to downshift. It stays in third. Also when I approach a stop, and then start again, the trans always starts in second gear. I have to press the accelerator atleast 40% from a stop to get it to downshift to 1st again, where it shifts back to 2nd before I even hit 10-15mph, sometimes slower. Any ideas :/