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-   -   Z3 rear diff mount issues (http://www.bimmerfest.com/forums/showthread.php?t=657863)

TBuff 11-13-2012 06:28 AM

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.

ZEEBOY 11-13-2012 06:43 AM

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

Randy Forbes 11-13-2012 07:35 AM

erandyforbes@aol.com

http://www.spcarsplus.com/gallery3/v...g?m=1304269916

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

TBuff 11-13-2012 10:41 AM

Quote:

Originally Posted by ZEEBOY (Post 7191886)
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. :D

ZEEBOY 11-15-2012 08:28 AM

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....

khammack 11-15-2012 05:42 PM

Quote:

Originally Posted by TBuff (Post 7191869)
Can anybody suggest a good kit to go with?

I would go with Randy's. See his post above.

TBuff 11-16-2012 12:41 PM

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. :eek:

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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