1989 Chevy K1500 4x4 Clunk When Turning

GMC C1500
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SLOPEZ
  • MEMBER
  • 2 POSTS
I have a 89 Chevy K1500 long box. When I put it in 4H or 4L it makes a loud clunking noise. I am not sure if it is staying locked into 4x4. It has the automatic hub locks, so I don't know if that could be the issue. It drives fine in 2wd with no noises. In 4L is seems it is trying to kick out of 4L and sometimes ends up being in the Neutral setting. Transfer Case? Axle problem? Hub issue? Any advise would help. After a little more investigation I have found that the loud clunking noise is only happening when the wheels are turned. It does not matter if the wheels are turned to the left or right. If the wheels are straight the clunking noise stops. I am guessing this would eliminate the transfer case or the driveline as the source. Any words or wisdom?
Jan 22, 2006 at 12:59 AM
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PALCO
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  • 83 POSTS
drive line........ transfer case chain drive......... auto hubs......... ring and pinion..... u-joint in the steering knuckle. take out the drive line. then engauge the transfer case if there's still a clunck you know what direction to go. good luck
Jan 22, 2006 at 2:36 AM
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KAZOO2281
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  • 12 POSTS
sounds like splines on front drive shaft are worn out had a 92 chev sivlerado 4x4 had it in 4 hi and heard a pop. splines were gone
Jan 22, 2006 at 10:21 AM
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SLOPEZ
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  • 2 POSTS
Any info.
Feb 1, 2006 at 5:59 AM
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CHEVY350GUY
  • ✓Experienced Mechanic
  • 109 POSTS
check u joints in front axle for play
Feb 2, 2006 at 3:31 AM
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Suggested Repair

Check the U-joints in the front axle for play.

Conversation Summary

The owner of a 1989 Chevy K1500 reports a loud clunk in 4H or 4L that occurs only when the front wheels are turned and stops when they are straight. The truck is quiet in 2WD and sometimes seems to drop out of 4L into neutral. Other replies suggested the driveline, transfer case, hubs, or worn front driveshaft splines. The expert recommended checking the front axle U-joints for play.

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