Hey guys, I got a 91 YJ Wrangler and it is acting up. When accelerating somewhere around 30mph and on the whole car starts to shake and vibrate. Now when I let of the throttle it stops the shaking and coasts with no problem. What could it possibly be? I feel like it is something inside the driveline. Maybe transfer case. And is it safe to drive? Any ideas?
I had this problem about a month ago, checked the u-joint and was all good, was checking the oil at a gas station and noticed one of the spark plug wires had come off, plugged it back in and no more shaking.
I just fixed this same problem..I thought it was a bad ujoint...turns out it was just a loose strap bolt..
threw some lock tite on it,torqued it back down along with rest of the bolts..no more shaking..