Hi,

I have a 2000 Cherokee sport with 110K. It was a surf car that really never went more then a few miles at low speeds, but a job change means that I'm driving it a lot more on freeways.

Lately I;ve noticed a vibration at high speeds. I just balanced and rotated the tires, replaced the front shocks and replaced the front rotors and brakes. I don't hear any knocking, so I'm not sure if it's the U Joint or something else. Could it just be needing a wheel alignment? Or something worn in the steering?

Also, I have never had the transmission fluid changed? Should I get it changed, flushed, or do nothing?

thanks.

 

Generally speaking:

1. rotating parts cause vibrations
2. toe-in/toe-out alignment problems cause tire wear
3. worn steering linkage causes sloppy steering
4. worn bushing/ball joints cause poor ride, tire wear

These are generalizations because even tires can cause a pull if the tire is defective.

You might try swapping your tires front to back and see if the problem moves. If rear tires badly out of balance you will feel it in your seat. It is possible that something as simple as a wheel weight fell off and now the tire is out of balance.

You really need to test the suspension for loose warn parts.

Raise the front end and push and pull on the tires.

Slop at 12 and 6 o'clock is usually a bearing or upper ball joint
Slop at 3 and 9 o'clock is usually steering linkage

Put a long bar under the tire and pull up on the tire while looking at the lower ball joint. If you see visible movement in the ball joint, it needs to be replaced.

Inspect the u-joints for rust near the caps and twist both sides of the u-joint back and forth to determine if slop between the axle shaft and the wheel joint.

 

^^Excellent advice^^

 

Do this first.

 

GREAT general advice for as little information given

Check those then come back and tell us what you found.