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Unread 06-14-2008, 03:20 AM   #1
joemomma4040
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toe in, balance, alignment help

I have a 97 jeep tj 4.0l it has a 3" fulltraction lift and 33x12.5 goodyear wranglers. When driving at any speed my tires seem to make a humming noise if I turn the steering wheel to the right slightly the sounds gets worse, if I turn it to the left the sound goes away. What is this tire balance, toe in allignment? Also the tires do not seem to be wearing unevenly. Any help is appreciated

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Unread 06-14-2008, 05:59 AM   #2
robncar
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I'd go with toe, easy to set yourself. If the tires were out of balance, you'd likely have vibration. Here's a good start:

http://www.4x4xplor.com/alignment.html
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Unread 06-14-2008, 10:44 AM   #3
pilot-one
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Quote:
Originally Posted by joemomma4040 View Post
I have a 97 jeep tj 4.0l it has a 3" fulltraction lift and 33x12.5 goodyear wranglers. When driving at any speed my tires seem to make a humming noise if I turn the steering wheel to the right slightly the sounds gets worse, if I turn it to the left the sound goes away. What is this tire balance, toe in allignment? Also the tires do not seem to be wearing unevenly. Any help is appreciated

Does it pull? The humming is either the tire/tires or a bad wheel bearing.
Even if the tires LOOK like they are wearing evenly they could have a subtle cupping that would make them hum.
Rotate the tires see what happens.

You can set the toe yourself as mentioned. If it turns out it is way off then you may have discovered the underlying cause of your problem.
If the toe is OK and swapping the tires makes a difference then you probably need an alignment as you may have unusual wear on your tires. (you do rotate them right?) Your lower control arms should be adjustable so the caster can probably be set to the optimum setting of about 5 degrees for a 3 inch lift. Remember if you adjust the caster you are also changing the front pinion angle. If you move it too much you could end up with vibration issues.
My guess is your toe is off (it should be 1/16"-1/8" toe-in) plus you don't rotate your tires like you should causing the tires to wear to the point of humming.
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Unread 06-14-2008, 11:45 AM   #4
joemomma4040
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thanks for the advice I will try the toe and I probably isn't the tires because I do rotate them every oil change
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