Clunk From Rear End

Yapakanichi · 05-02-2018, 10:34 AM

Hey everyone, so I've got an interesting issue...

I've been getting like a thud in the rear of the car. It seems to be in the right rear. Almost like something is moving. I'm running full Powerflex bushings in the suspension with new bilstein and H&R springs. Hell the entire suspension was rebuilt. Replaced with OEM where it was needed.

I'm scared it might be a differential bushing. It happens at slow speeds (probably can't hear it at fast speeds). But it's just a "thunk" like when applying the brakes, or accelerating. It doesn't happen all the time, just every so often.

Was hoping someone could shoot me some ideas on where and what to look for.

Steeler · 05-02-2018, 10:47 AM

Check torque at all the suspension attachment points.
I had the same thing after full poly rebuild.
Sounded like the diff but was actually the sway bar bushing mounts.

mainsoda · 05-02-2018, 10:50 AM

I had a pretty serious clunk when my axel shaft started to fail. What happened to me is the bolts in the differential came loose and the drive train shifted just a bit putting the axel shaft at a weird angle until it failed.

Yapakanichi · 05-02-2018, 10:54 AM

Quote:

Originally Posted by dbarton62

Check torque at all the suspension attachment points.
I had the same thing after full poly rebuild.
Sounded like the diff but was actually the sway bar bushing mounts.

Do you have torque specs by any chance?

Steeler · 05-02-2018, 11:09 AM

Quote:

Originally Posted by knowthebattle

Do you have torque specs by any chance?

http://forum.e46fanatics.com/showthread.php?t=1054309

This is what I used
Might suggest checking the TIS as well.
Don't want to steer you wrong

racerbruce · 05-02-2018, 11:26 AM

Quote:

Originally Posted by knowthebattle

Hey everyone, so I've got an interesting issue...

I've been getting like a thud in the rear of the car. It seems to be in the right rear. Almost like something is moving. I'm running full Powerflex bushings in the suspension with new bilstein and H&R springs. Hell the entire suspension was rebuilt. Replaced with OEM where it was needed.

I'm scared it might be a differential bushing. It happens at slow speeds (probably can't hear it at fast speeds). But it's just a "thunk" like when applying the brakes, or accelerating. It doesn't happen all the time, just every so often.

Was hoping someone could shoot me some ideas on where and what to look for.

http://www.zpost.com/forums/showthread.php?t=1325707

05-02-2018, 10:34 AM	#1
Yapakanichi Monkey Marshall 635 Rep 218 Posts Drives: 2005 Z4 3.0i Join Date: Dec 2016 Location: FL iTrader: (0)	Clunk From Rear End Hey everyone, so I've got an interesting issue... I've been getting like a thud in the rear of the car. It seems to be in the right rear. Almost like something is moving. I'm running full Powerflex bushings in the suspension with new bilstein and H&R springs. Hell the entire suspension was rebuilt. Replaced with OEM where it was needed. I'm scared it might be a differential bushing. It happens at slow speeds (probably can't hear it at fast speeds). But it's just a "thunk" like when applying the brakes, or accelerating. It doesn't happen all the time, just every so often. Was hoping someone could shoot me some ideas on where and what to look for.
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05-02-2018, 10:47 AM	#2
Steeler Colonel 2429 Rep 2,704 Posts Drives: Built not Bought 04 Z4 VF Join Date: Feb 2013 Location: Kitchener Ontario Canada iTrader: (2)	Check torque at all the suspension attachment points. I had the same thing after full poly rebuild. Sounded like the diff but was actually the sway bar bushing mounts. __________________ W2A Intercooled Vortech V3Si, custom ducting, Alpha N, 60# Bosch,2.62 pulley, multi port WMI, Severn Tuning(pokeybritches), Tial, magnaflow,SS race muffler, 42 design,3.91LSD, H&R, Hotchkis,ST coils,Konis, Megan camber arms, AKG SS, Nylon mounts, Poly bushings, Carbon interior, CF Aero.APEX
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05-02-2018, 10:50 AM	#3
mainsoda Private First Class 172 Rep 150 Posts Drives: 2006 BMW Z4M coupe Join Date: Apr 2017 Location: Milwaukee WI iTrader: (0)	I had a pretty serious clunk when my axel shaft started to fail. What happened to me is the bolts in the differential came loose and the drive train shifted just a bit putting the axel shaft at a weird angle until it failed.
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