I would check all u joints first. Anything that rolls or rotates could be out of balance.
http://www.clubfrontier.org/forums/f8/my-first-real-problem-my-truck-57756/
http://www.clubfrontier.org/forums/f8/my-first-real-problem-my-truck-57756/
X2 Look at my post and get that crap fixed ASAP! You will be sad you didn't. I can say the same exact thing as you, on the highway the vibration went away.I would check all u joints first. Anything that rolls or rotates could be out of balance.
http://www.clubfrontier.org/forums/f8/my-first-real-problem-my-truck-57756/