Theres a slight grinding at 45 and really rough shifts from park into any gear. This is my first jeep and I've only had it for 5 weeks. Any ideas of where to start would be really helpful. Its a 99 Cherokee 4.0

 

Trans is grinding at 45? Something else?
It slams into gear from park? What's the idle speed and how loose are your u-joints?

 

Start by changing the transfer case fluid. I had that problem on my '92 and it helped a lot.

Other things to check would be U-joints, rear gears, trans fluid condition.

 

From what direction do you hear the sound? If it is coming from up front it would be a bad wheel bearing, front axle u-joints, bad front pinion bearing, Front drive shaft U-joints, transmission, transfer case, rear drive shaft u-joints, rear pinion bearing, rear wheel bearings......etc.

 

I feel it grinding like dozer tracks with stones in the wheels. I don't have carpets I bedlined my interior. All of the u joints were replaced at the same time and have less than 8k the bearings could be it. The rare times I do actually hear it its coming from the hump under my console that's why I think it might be the tranny but I'm by no means a mechanic so wouldn't begin to k ow what to look for if I started taking it all apart.

 

It didn't shift bad at all today. But I was driving more than normal the grinding was still there though

 

have you checked fluid level in transfer case? Hmm....were the ujoints on the front drive shaft replaced?

 

The po is a mechanic and tow driver they look new to me and he said he did them all. There isn't any wiggle by hand either

 

^^