I have an 04 TJ. bought it stock from Carmax last year. (The TJ is a in-line 6, 2.4 liter with 65, 000 miles) It ran great until I had a 4 inch lift and 33's. Everything fine in town, but when I headed to Utah to try out the new lift, I found on the Freeway, when running about 3000 RPMs and 60-65mph I shift up to 5th and right after shifting both RPMs and MPH take a nose dive and I end up down shifting.
I understand Jeeps not built for speed and the lift has some effect on highway driving, but would like to be able to go more then 60 mph.
Is there anything I am doing wrong, or can do to increase high MPH power?