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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 09-12-2016, 10:18 AM
smayo964 smayo964 is offline
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Location: MS
 
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Mein Auto: 1999 Z3 Roadster
Road Trip

Since rebuilding the back end of the ole speedbuggy, it was good to get a long distance road trip under its belt. Headed from MS to Hanover PA this weekend. Took a drive around Gettysburg Sunday with the top down. The only issue I'm finding is the excessive rear gear noise. There has always been a differential whine, which seem to be amplified with the new mounting of the trunk modification. But, at 75-80mph the backlash whine was pretty darn loud. Without looking into the documentation, is it pretty easy to re-shim the differential? Any issues with doing it with the rear end still in the car?
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My '99 Z3 Alpine White 2.8L Speed Buggy
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  #2  
Old 09-12-2016, 03:25 PM
nfunk nfunk is online now
1998 BMW Z3 2.8L
Location: New Orleans
 
Join Date: Oct 2011
Posts: 278
Mein Auto: 1998 BMW Z3 2.8L
My '98 2.8L roadster has rear end whine at highway speeds. If I accelerate the whine increases but if I back of the gas and remain at a constant speed the whine diminishes greatly.
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Old 09-12-2016, 04:06 PM
NZ00Z3 NZ00Z3 is offline
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Mein Auto: 2000 Z3 3.0i
Did you install poly bushings in the sub-frame during the rear end re-build? They tend to transmit more diff noise that the rubber ones. The amount of noise that the diff is producing may not be changing, just the ability of it to be transmitted into the car.
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Old 09-12-2016, 05:50 PM
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vintage42 vintage42 is offline
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Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 3,316
Mein Auto: 1997 BMW Z3 1.9 5MT
Maybe the whine is caused by worn differential gears, the result of leaving the "lifetime fill" of gear oil in there too long. Mine had no whine at 32,000 miles when I changed the lifetime fill, and no whine now at 45,000. There is no noise at all.
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Old 09-13-2016, 02:58 PM
nfunk nfunk is online now
1998 BMW Z3 2.8L
Location: New Orleans
 
Join Date: Oct 2011
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Mein Auto: 1998 BMW Z3 2.8L
I got the car at 18,000 miles with original diff fluid. I thought about changing it but not sure which differential fluid for the Torsen differential.
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  #6  
Old 09-13-2016, 04:12 PM
smayo964 smayo964 is offline
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Location: MS
 
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Mein Auto: 1999 Z3 Roadster
NZ00Z3, no, I went back with factory rubber bushings. I did add material to the gaps of the differential mount to make it more solid for load carrying. There was an immediate rear end whine noise increase, but not terribly loud for local driving. I've had Mobil_1 in the rear end for the past 50k miles. The noise is definitely a backlash sound as when I'm in the gas at higher speeds the noise is minimal. I probably do need to check the rear u-joint as I have already replaced the front a while back.
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