Annoying Clunk after Stopping - JeepForum.com
 
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post #1 of 14 Old 08-08-2021, 12:20 PM Thread Starter
JonS
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Annoying Clunk after Stopping

I have been getting this annoying clunk after stopping at a red light or stop sign. I think it’s the transmission but it could be the transfer case. Any idea what it might be?



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post #2 of 14 Old 08-08-2021, 12:28 PM
MaintMech
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Do you get the clunk on acceleration after stopping or after a complete stop?

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post #3 of 14 Old 08-08-2021, 12:31 PM
Tinker0000
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Could be a bad mount allowing the engine, trans to move.

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post #4 of 14 Old 08-08-2021, 05:12 PM Thread Starter
JonS
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Sometimes upon accelerating but mostly up on stopping. I put my foot on the brake and accelerator in drive and in reverse and did not see the engine move implying the motor mounts are OK.


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post #5 of 14 Old 08-08-2021, 08:22 PM
Rapidrob
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The proper method is to jack up both rear wheels and put the Jeep in drive. Spin the wheels to 20-30 mph indicated and stamp on the brakes. Have yourself or a friend look at the engine mounts or transmission mount while doing this.

If the mount/s are bad you will see and hear them.

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post #6 of 14 Old 08-08-2021, 08:50 PM
PolkaPower
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Quote:
Originally Posted by JonS View Post
I have been getting this annoying clunk after stopping at a red light or stop sign. I think itís the transmission but it could be the transfer case. Any idea what it might be?

Check the rear upper track bar bolt for tightness. I've had one loosen up a few years ago and on starts and stops it would slide forward or backwards and clunk. Since its a unibody the sound travels all around and can seem like it's coming from another area. Took a few days to figure it out.


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post #7 of 14 Old 08-08-2021, 08:59 PM
gutthans
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Let's go front to back:
Torque of acceleration or deceleration in gear can wiggle the block with bad motor mounts
Backlash (wear) can be heard as a clunk from any gear surface that is in the drivetrain
Failing U-joints/straps make a clunk
Rocking transmission can clunk if a mount is bad or the torque arm is loose
Chain slack in the tcase can clunk (but you'd have to be in 4 wheel) (I think)
Shifting axlehousings clunk, but also have a torque twist that throws the vehicle slightly
Rear track bar already mentioned
Loose exhaust hangers can cause the pipe/muffler to whack the underbody

That's it for me.

Last edited by gutthans; 08-09-2021 at 03:01 PM.
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post #8 of 14 Old 08-09-2021, 05:50 AM
HighLonesome
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I had this happen and it was control arm bushings.
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post #9 of 14 Old 08-09-2021, 09:15 AM Thread Starter
JonS
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Thanks everyone- will check all of the above.


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post #10 of 14 Old 08-10-2021, 06:21 PM
T Hoff
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Few things come to mind.
Drive shaft U joints
Brake caliper pin loose or one missing.
Motor or trani mounts.

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post #11 of 14 Old 08-10-2021, 06:38 PM
catfish51
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Lock the brakes and rev the motor in forward Then lock the brakes and rev the moor in reverse have someone watch the motor and then the transmission and transfer case to see if they jump in either direction That will tell if the mounts are bad Then on the ground and in park try and rotate the drive shafts back and forth to see if there is any movement of the u joints .This will also show the gear slop in the differentials Check the caliper mounting bolts to see if they are loose You can also have someone with the motor running turn all the way right and then all the way left and see if the tracking bar is moving at it's 2 mounts
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post #12 of 14 Old 08-10-2021, 09:44 PM
buster51
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driveline clunk

Our 97 Cherokee has done it since new. On ours it's the slip joint on rear driveshaft. As long as I keep it greased it's OK, but I have had to take it apart and clean or it sticks and clunks
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post #13 of 14 Old 08-11-2021, 05:48 AM
TaperedRoller
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I second the rear driveshaft theory. Remove rear driveshaft, clean the slip yoke with brake cleaner (transfer case end) to remove old grease, and liberally relube using silver or gray antisieze.
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post #14 of 14 Old 08-11-2021, 03:15 PM
jb1331
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When is the last time your changed / checked your diff fluids? I had an issue like that years ago and it went away after changing the fluid.

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