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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 11-13-2012, 06:28 AM
TBuff TBuff is offline
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Z3 rear diff mount issues

I am currently building a 99 Z3 for the wife. The car was given to me as payment for some work did for the owner. The issue is the car was in a wreck, it was hit on the driver side rear quarter. I found a parts car for cheap and have most of what I need to fix the car. I will be swapping the rear diff assembly from the parts car as the lower control arm on mine was bent. I have both assemblies out and the diff I will be installing at the local BMW shop being inspected before installation.

The big question I have is the diff mount is starting to split. The only place splitting is where the third member bolts to the body, I do not see any other stress cracks in the body. I understand this is a common issue and there are kits out there to reinforce this area. Can anybody suggest a good kit to go with? I've looked at several sites and not found anything as of yet, I think UUC makes one?

The original diff had 3:15 gears in it and the new rear has 4:10 gears since it was an auto. It should make for a fun car to drive when I is done! Thanks in advance for the info.
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  #2  
Old 11-13-2012, 06:43 AM
ZEEBOY ZEEBOY is online now
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I'm not up on rear axle ratios, but 4.10 sounds like it could be from a 4 cylinder car. I would wonder about the strength of that differential for a 6 cylinder car...Randy Forbes, who visits these pages regularly is the guy to answer your differential mount question
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  #3  
Old 11-13-2012, 07:35 AM
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Randy Forbes Randy Forbes is offline
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Here's a link to the album of this forums' moderator's 3.0 Coupe. You'd want to do a similar repair on the car you're building for your wife: http://www.spcarsplus.com/gallery3/index.php/LZ_02
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  #4  
Old 11-13-2012, 10:41 AM
TBuff TBuff is offline
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Quote:
Originally Posted by ZEEBOY View Post
I'm not up on rear axle ratios, but 4.10 sounds like it could be from a 4 cylinder car. I would wonder about the strength of that differential for a 6 cylinder car...Randy Forbes, who visits these pages regularly is the guy to answer your differential mount question
Actually the rear came out of a 2.8 auto car so it should handle what my 2.5 can give it.
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  #5  
Old 11-15-2012, 08:28 AM
ZEEBOY ZEEBOY is online now
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TBuff, that is good to hear that it is from a six cylinder car...be prepared for your highway/interstate rpms to go up @25% and your gas mileage to go down some....
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Old 11-15-2012, 05:42 PM
khammack khammack is offline
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Quote:
Originally Posted by TBuff View Post
Can anybody suggest a good kit to go with?
I would go with Randy's. See his post above.
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  #7  
Old 11-16-2012, 12:41 PM
TBuff TBuff is offline
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I've been in contact with Randy. That is a very nice kit he offers. I already have the rear of the care completely stripped so no "real" extra work to install it.

I am not really concerned with the extra RPMs or loss of milage. This will be a weekend toy to enjoy instead of a daily driver. She is excited about having some spirited 0 to 60 fun or enjoying a spin down the Blue Ridge Parkway.
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