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Old 01-21-2017, 10:47 PM   #1
LCPLPunk
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Rear clunk after installing Prothane subframe bushings

Hey guys,

So I installed some Prothane subframe bushings last weekend and today I noticed some pronounced clunks after driving over some potholes/crappy pavement.

During install I torqued the subframe bolts to 120 ft lbs, and today I rechecked the lower shock bolts to 60 ft lbs. I also checked the endlinks for the swaybar and they were tight. What else should I check?

One other thing I noticed was the day after I installed them I went for an hour long drive and the rear end felt like it was wondering a little bit.

Things I removed for the install:

Subframe bolts
Lower shock bolts
Wheels - checked those too, they are good

I was thinking next to check the top shock nuts, any other ideas?
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Old 01-22-2017, 12:56 AM   #2
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Brainstorming here. Are the subframe bushings seated completely in the cradle?
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Old 01-22-2017, 08:11 AM   #3
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Shock top Nuts, give it a hard burp with a impact gun.
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Old 01-22-2017, 12:48 PM   #4
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Ya, bushings are fully seated. I'm thinking the shock nuts as well. I drove the car around after I posted this and the clunks seemed more pronounced in the upper rear area of the car.

Thanks guys!
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Old 01-22-2017, 03:11 PM   #5
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Did you install different rear upper control arm bushings?
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Old 01-22-2017, 03:35 PM   #6
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No. I have them, but decided to not install them this go around.
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Old 01-22-2017, 04:16 PM   #7
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If the bolt sleeves in side the bushings are bit to long you will get a clunk , put a jack on the lower cradle and see if there is any up and down movement, you might have to grind down the sleeves few mm to compress the poly bushings if the sleeves are to long , should have 2 to 3mm of bushing past both sides of the sleeve
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Old 01-22-2017, 05:40 PM   #8
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Sounds like quite a bit of work to do that...I can live with the clunk.

And I tighten a few more things down and after a short ride today didn't seem to notice much, if any clunking. I'm hoping whatever I did fixed it.
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