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Old 02-27-2018, 09:38 PM   #1
BugeyeZo
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Default Please help !! Rear end popping sound while accelerating

What's up guys. So I swapped in a 2004 sti drivetrain into my 2003 Bugeye. It ran great and still does. But for w.e reason I get this clunking/ popping sound coming from some where in the rear end (sounds like driver side) when I accelerate. It gets noticeably worse when there is 4 ppl in the car. It will go away sometimes when the car has warmed up for a bit. Sounds like someone is snaking my drivetrain with a mallet in a consistent way.

Almost all bushing have been replaced to polyurethane. And lateral links are all whiteline. I have apexi coilovers and whiteline sway bars with alloy sway bar brackets. I Just rebuilt the rear dif (r180) a couple months ago because I could have sworn it was the rear diff. But even after doing all that the noise is still there. Also just took apart the whole driver side rear end in hopes of finding something broken and saw nothing. The axle seemed alright. No ripped boots. The coilover seemed healthy (25,000 miles on them).The only thing I haven't changed are the bushings in the trailing arms or the rear wheel bearings. But the bearing seem to be in good condition and spin freely and have no play. I'm lost. If anyone has had this problem or has an idea please save me lol.
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Old 03-01-2018, 05:59 PM   #2
fleezy
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when does the clunk happen? when you're shifting? when u hit a bump?
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Old 03-01-2018, 06:22 PM   #3
Z3RO
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what rear diff are you running?
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Old 03-02-2018, 01:37 AM   #4
BugeyeZo
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Quote:
Originally Posted by fleezy View Post
when does the clunk happen? when you're shifting? when u hit a bump?


When I accelerate hard it happens.
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Old 03-02-2018, 01:39 AM   #5
BugeyeZo
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Quote:
Originally Posted by Z3RO View Post
what rear diff are you running?


R180
I just replaced that trailing arm bushings because they were the last rubber bushing on the car lol. Didn't help at all
I'm beginning to think it's a bad axle.
Will update when I put the new one in
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Old 03-02-2018, 09:32 AM   #6
Charlie-III
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1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

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So this clunk started after the drivetrain swap, correct?
Were these parts OK in the last car?
Were the coilovers swapped in at the same time?

Let's assume the above is all "yes", have you checked torque on things like the rear subframe, pry on things to make sure they are actually tight and not just hardware that bottomed out or got stuck?
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Old 03-03-2018, 10:37 PM   #7
BugeyeZo
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Quote:
Originally Posted by Charlie-III View Post
So this clunk started after the drivetrain swap, correct?
Were these parts OK in the last car?
Were the coilovers swapped in at the same time?

Let's assume the above is all "yes", have you checked torque on things like the rear subframe, pry on things to make sure they are actually tight and not just hardware that bottomed out or got stuck?


No sir. The clunk started about a year after the swap.
I already had the coilovers before the swap.
Everything looks and seems ok. The noise goes away after some driving. Maybe not totally gone but not nearly as loud as when I first get In it.
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Old 03-05-2018, 09:45 AM   #8
Charlie-III
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1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

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Quote:
Originally Posted by BugeyeZo View Post
No sir. The clunk started about a year after the swap.
I already had the coilovers before the swap.
Everything looks and seems ok. The noise goes away after some driving. Maybe not totally gone but not nearly as loud as when I first get In it.
So you did the swap over a year ago and the clunk is recent?

Since it's not a clunk going over bumps/potholes, and it's been fine, yes, could be an axle. I'm stil leaning towards a bushing is loose or possibly failing.
Yes, let us know what happens with a new axle.
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Old 03-12-2018, 06:07 PM   #9
BugeyeZo
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Installed new axle today and all my problems are gone !!
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Old 03-13-2018, 11:44 AM   #10
Charlie-III
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Silver Sleeper BK, 5MT

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Quote:
Originally Posted by BugeyeZo View Post
Installed new axle today and all my problems are gone !!
Glad you got it fixed.
Thanks for posting a resolution, I hate dead end threads.
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Old 03-13-2018, 07:08 PM   #11
BugeyeZo
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Seriously
I've read way to many to no avail
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