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General E46 Forum
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Old 04-01-2013, 12:43 PM   #1
Mctwist77
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Join Date: Apr 2010
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My Ride: '99' BMW 323i
Rear end still clunking, replaced everything. Interal diff issue or axle?

Still have my rear end clunk I have replaced the following:

Subframe reinforcement
All Subframe bushings
All differential bushings
Guibo
CSB
Transmission mounts

I havent replaced my:
Motor Mounts

I notice if I spin the driveshaft there is a decent amount of play in it and when the axles start spinning and they stop I can hear a metal on metal clunk. Is this normal? Im thinking the differential has an internal issue because of the amount of play. Or my axles are bad. Any suggestions?
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Old 04-01-2013, 12:44 PM   #2
srbija 328i
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Rtab's
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Old 04-01-2013, 01:00 PM   #3
Mctwist77
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That would cause noise on shifting?
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Old 04-01-2013, 01:13 PM   #4
lszlszx
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You need to jack up the rear and get under the car. With the transmission in neutral and parking brake released move the driveshaft, then the wheels back and forth. You'll see excessive play at either the differential, or at the axles if those are at fault.
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Old 04-02-2013, 04:18 PM   #5
Mctwist77
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So RTAB's can cause a clunk when you shift? Im going to replace them first.
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Old 05-16-2013, 03:17 AM   #6
swordsman11868
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Mctwist77-

Did you ever determine the cause of you clunk? I ask because I have recently developed said clunk when shifting from Neutral into Drive (only). Others have it when going into Reverse also.

When I shift into drive, besides the clunk, the back end "squats" quite a bit. I'm thinking it's my giubo at this point and probably my CSB may need replacing as well.

I inspected the rear end without removing anything and my rear bushings look fine from the outside.

I hope it's just flex disc and/or CSB as they seem not too difficult!

TIA
-Dan
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Old 05-16-2013, 11:02 AM   #7
jasonbimmer
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could be just your diff becoming very loose over the years.
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Old 05-16-2013, 11:23 AM   #8
lszlszx
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I'm afraid it is your differential.
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