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Old 05-11-2014, 06:55 PM   #1
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Strange clunking noise??

I have taken the plunge into Jeep ownership with a 1993 YJ, I6, auto, p/s, p/b, tilt steering, stock on 31's. Everything seems pretty cherry with 133K miles and no rust. This Jeep has spent most of it's life being towed behind a motor coach. I took it to the woods today to see what I might need to check into and found a strange clunking noise occasionally when hard turning or hard acceleration in 4WH or 4WL. The noise seems to come from under the Jeep near the drivers seat. It will clunk once or twice if accelerating up a soft hill or may clunk many times when turning a tight corner while in 4WL and under power. No strange noises when in 2WH on highway, turning or under load. I was thinking the that transfer case chain may be stretched due to all of the miles being towed in neutral. Is there a way to adjust the chain if it is the noise I hear? Any input you may have for a "New-be" would be greatly appreciated.

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Old 05-11-2014, 07:40 PM   #2
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Quote:
Originally Posted by andyldavis View Post
I have taken the plunge into Jeep ownership with a 1993 YJ, I6, auto, p/s, p/b, tilt steering, stock on 31's. Everything seems pretty cherry with 133K miles and no rust. This Jeep has spent most of it's life being towed behind a motor coach. I took it to the woods today to see what I might need to check into and found a strange clunking noise occasionally when hard turning or hard acceleration in 4WH or 4WL. The noise seems to come from under the Jeep near the drivers seat. It will clunk once or twice if accelerating up a soft hill or may clunk many times when turning a tight corner while in 4WL and under power. No strange noises when in 2WH on highway, turning or under load. I was thinking the that transfer case chain may be stretched due to all of the miles being towed in neutral. Is there a way to adjust the chain if it is the noise I hear? Any input you may have for a "New-be" would be greatly appreciated.
Check all ujoints. The two on the front axle, two on front driveshaft and two on the rear driveshaft.

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Old 05-11-2014, 08:49 PM   #3
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My son had a clunking in 2wd and ignored it. Twelve hundred dollars later, slip joint eliminator kit, transfer case rebuild, new rear constant velocity drive shaft and new universals in the front drive shaft....no more clunking.

One thought I had about the clunking is that while turning hard, the wheels have a tendency to buck. With a bad universal in the front, that may cause the clunk whilst the wheels buck in the tight radius. I would check them closely.
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Old 05-12-2014, 12:23 AM   #4
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Bad universal joints on the front axles most likely, I had this same problem. Bucks/binds sometimes when turning hard, clunk that is NOT consistent with bumps on the road, but with accelerating and decelerating/stopping. All the bearing in the ujoints were gone, so metal would tap against metal causing the clunking and tapping. not really a big safety issue on the road but stay out of 4 wheel drive and on the roads until you get it fixed.

Also, drive down an alley or someplace with a solid fence that can bounce sound back towards you with the windows down or doors off. If you hear a slight tapping or clicking as you drive, it's the ujoints on the front axles. If you feel a vibration under your seat that increases in volume and pitch with speed in 4WD, it's probably your front drive shaft u joints. If it's doing this in 2WD or both, it's your rear drive shaft u joints, or u joints on both drive shafts.
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Old 05-12-2014, 07:29 AM   #5
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Thanks for the suggestions. I will check those out as soon as possible. Wish me luck.
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Old 05-17-2014, 07:43 PM   #6
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Thanks to Allmudd, and Cricketboy for your input. We put the YJ on the lift and found the left front axle u-joint really wasn't doing its job anymore. Found other issues while under there: cracked exhaust manifold above the collector, leaking trans gasket and seal. Hope to get this taken care of and a fuel sending unit by next weekend.
Thanks to all for the help, it pointed me to the right area.

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