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Old 01-31-2013, 03:32 PM   #1
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Broken front u joint perfect...

Went wheeling for about 10mins. Put the jeep in 4 lo to go up small rock section. Don't spin tire, not doing anything crazy, no heavy pedal and CLUNK there goes my passenger side front U joint. GREAT. U joint goes and it breaks the knuckle off the inner and outer shaft. Somehow made it home with flashers on doing about 15mph clunking away. Anyone else every have this happen before?

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Old 01-31-2013, 03:38 PM   #2
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It probably happened in a different order than how you described it... the unhardend "ears" on the factory carbon steel axle shafts that hold the u-joint very likely broke or stretched first. That allowed the u-joint to pull free, spin around, then bust up inside the inner/outer axle shaft ears.

That happens with big tires & a locker, especially when you give it too much gas when the steering wheel is turned too far to the left or right which places more stress on the ears & u-joint.

Replacing the OE carbon steel shafts with aftermarket hardened chromolly axle shafts stops that from happening.

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Old 02-03-2013, 02:11 PM   #3
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Quote:
Originally Posted by Jerry Bransford View Post
It probably happened in a different order than how you described it... the unhardend "ears" on the factory carbon steel axle shafts that hold the u-joint very likely broke or stretched first. That allowed the u-joint to pull free, spin around, then bust up inside the inner/outer axle shaft ears.

That happens with big tires & a locker, especially when you give it too much gas when the steering wheel is turned too far to the left or right which places more stress on the ears & u-joint.

Replacing the OE carbon steel shafts with aftermarket hardened chromolly axle shafts stops that from happening.
so before it gets to the point where it does finally go,(I think mine are about to go) how do you replace these ale u joints?
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Old 02-03-2013, 02:16 PM   #4
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Quote:
Originally Posted by MuddyTJ97 View Post
Went wheeling for about 10mins. Put the jeep in 4 lo to go up small rock section. Don't spin tire, not doing anything crazy, no heavy pedal and CLUNK there goes my passenger side front U joint. GREAT. U joint goes and it breaks the knuckle off the inner and outer shaft. Somehow made it home with flashers on doing about 15mph clunking away. Anyone else every have this happen before?
the u-joint was well on it's way out, and you didn't pay attention to the warning signs.

next time, inspect your u-joints and look for warning signs. Then you won't blow a u-joint catastrophically, need to limp home and have to buy a whole new shaft.



Here's how to replace u-joints:
U-Joint Replacement - 1
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