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Old 09-25-2013, 08:15 AM   #1
TJ-Chuck's Avatar
Join Date: Sep 2013
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front axle u-joints

would bad front u-joints cause a shake or vibration at highway speed, or any other driveability symptom?

I know mine need to be done (mechanic told me so), but I'm wondering if this vibration I get between 60-65 is from unbalanced wheels, and I need to get that done, too.
Maybe I should just hold off on wheel balancing until I get the u-joints done. I'm just curious, really.

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Old 09-25-2013, 08:48 AM   #2
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If its a vibration at a certain speed I'm thinking it's the tires out of balance ....just get it all done at once

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Old 09-25-2013, 09:54 AM   #3
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I'm having similar symptoms, smooth drive till ~60mph then vibrations. The vibrations feel like they are coming from the drive train. I've already done the rear ds u-joints but have not changed the front. I can feel a little play in the drive shaft and I believe they need to be changed, I'm just trying to decide how urgent it is.
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Old 09-25-2013, 11:49 AM   #4
Knows a couple things...

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Rotational play on the driveshaft is normal due to the backlash (slop) between the axle's ring and pinion gears. There should however be zero slop/movement within a u-joint though.
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Old 09-25-2013, 11:53 AM   #5
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When you're checking u-joints, you need to look at all axis of movement, plus signs of rust inside of the cups (especially since you're in the rust belt...).

Check the driveshaft for up-down and side to side movement, along with rotational movement. Keep an eye out for rust "dust" seeping out from the seals while you're moving the driveshaft and flexing the u-joints. To fully check it, you might have to pull the driveshaft.
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