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Old 04-29-2015, 02:15 PM   #1
sterlingpearce
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Default Rear clunk and heavy vibration under power

Hey all, I've got a automatic 1989 240DL wagon and I'm trying to chase down an issue I've been dealing with.

The current symptoms are a decently loud (but not consistent) clunk when starting or stopping, and vibration or shuddering when under power. The vibration also seems to be related to speed, with some speed ranges riding much smoother. I recently topped up the transmission fluid and the vibration is now worse???

Any thoughts?

Thanks!
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Old 04-29-2015, 02:39 PM   #2
benski
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A couple of thoughts:
U joints
intermediate carrier bearing
Rear Lower control arm bushings
tire(s) out of balance
How long has it been since all these things have been looked at? Did you just get ahold of this vehicle?


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Old 04-29-2015, 03:00 PM   #3
TurboDenny
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Had the same "clunking" sound with mine, torque rod bushings were practically non-existent. Would recommend skipping polyurethane on the parts if that had crossed your mind.
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Old 04-29-2015, 03:02 PM   #4
Thor
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The clunking is likely the Torque Rod Bushings being bad.

The vibrations are likely caused by the rest of the bushings being bad, (Panhard Bar & Lower control arms). These being bad are causing the rear end to be out of alignment with the drive shaft causing excessive where on the U-joints and carrier bearing . Sagging engine mounts and trans mounts don't help either.
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Old 04-29-2015, 03:06 PM   #5
Thor
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Quote:
Originally Posted by TurboDenny View Post
Had the same "clunking" sound with mine, torque rod bushings were practically non-existent. Would recommend skipping polyurethane on the parts if that had crossed your mind.
Poly bushings are OK for the torque rods and panhard bar. Just make sure they are well greased with Marine grease lest you get creaky suspension. Definitely keep to rubber bushings for the lower control arms.
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Old 04-29-2015, 08:19 PM   #6
sterlingpearce
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She's an old girl so I'll check the bushings and rods, but I still feel like it's more related to driveshaft since it is amplified under load. Could even be a result of a bunch of these things together!
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Old 04-30-2015, 12:10 AM   #7
mhgreen
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My 28 year old rear trailing arm bushings looked like they had been run a couple times through a wood chipper....replaced and clunky take off/stop went away
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Old 04-30-2015, 02:21 AM   #8
benski
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Quote:
Originally Posted by mhgreen View Post
My 28 year old rear trailing arm bushings looked like they had been run a couple times through a wood chipper....replaced and clunky take off/stop went away
Yep...
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Old 04-30-2015, 02:22 AM   #9
benski
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Quote:
Originally Posted by Thor View Post
Poly bushings are OK for the torque rods and panhard bar. Just make sure they are well greased with Marine grease lest you get creaky suspension. Definitely keep to rubber bushings for the lower control arms.
Yep...
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