[mepotts]

I've had a couple problems for a while now and am just now getting around to fixing them. I've got a '98 TJ with a 4.0L and a 32RH tranny. When I take off hard I get a real bad rumble, and even occasionally going into 2nd gear at high speeds. My other issue is when I put it in gear it lurches every time, both in forward and reverse.

I've been told the first problem could be either my U joint or engine/tranny mounts. I have no idea about the other. Any input is greatly appreciated!!!

[mmerlinn]

Not sure what you mean by "lurches". Lurching can be caused by the transmission slamming into gear because of toasted clutches, bad pump, or a mean shift kit. U-joints, mounts, and differential can also cause some kinds of lurching.

Rumbling can be U-joints, mount problem, or rear end.

U-joints usually have a "popping" sound when they are going bad. If they pop enough times, they will either fly apart or weld themselves together, immobilizing you for sure.

[IslandTJ]

Could also be track bar or control arms...