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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Fri, Dec-08-2017, 05:50:13 PM   #11
BeerHat
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Default Re: M3 axle bolts, stock are longer???

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Originally Posted by BeerHat View Post
The replacements DO have locking teeth, just not all that visible through the bag. I may have to take a trip down to the dealer. This is a buncha crap.
The bolts I pulled are 50mm, the replacements are 46mm.
It appears I somehow have '95 M3 spec bolts in my 8/96 car. Correct part number according to realoem is 33211227279. These are M10x50mm.

Hope this saves someone some time, I've wasted a ton.

Dan
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Old Fri, Dec-08-2017, 06:40:27 PM   #12
BeerHat
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Default Re: M3 axle bolts, stock are longer???

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Originally Posted by Braymond141 View Post
What is the length on the new bolt?

BMW consolidates parts, usually superceeding older models with new model parts. Usually it is just a simple coating change (yellow zinc to ZNS3 zinc flake for example) but it’s becoming more common for the parts to be completely different.
I figured it out.

33211227279 M10x50mm (used on '95 M3)
33211227664 M10x46mm (96+ M3)

My car's diff, 08/96 build date, was apparently assembled using the pre-96 model year bolts.

The crappy part, those older axle bolts are like 20+ bux each now (not including shipping) everywhere I look, including dealer.

Anyone got any extra '95 diff bolts layin around they'd like to donate? :O)

Dan

Last edited by BeerHat; Fri, Dec-08-2017 at 06:57:30 PM.
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Old Fri, Dec-08-2017, 07:00:08 PM   #13
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Default Re: M3 axle bolts, stock are longer???

No, your 1996 is correct. 95 to very early 97 the rear ends are all 6-bolt CV driveshafts with solid axles. Sometime in 97 they switched to 4-bolt dual ujoint driveshaft and hallow axles.

It’s the ETK that is wrong. Normally it’s accurate, so good catch going back to 95 for the different length.

FYI your driveshaft tail end is identical to Euro. 6-speed swaps are easy, just switch the front half of the shaft.

Last edited by Braymond141; Fri, Dec-08-2017 at 07:03:39 PM.
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Old Fri, Dec-08-2017, 08:51:02 PM   #14
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Default Re: M3 axle bolts, stock are longer???

Buy the Mini Cooper version for $5 each. Mini 32106774042. Google is great.
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Old Fri, Dec-08-2017, 10:30:44 PM   #15
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Default Re: M3 axle bolts, stock are longer???

Yup, those bolts are expensive.

I went with a set of bolts from McMaster, because $20 for a bolt is ridiculous.

pics from build thread:





These are obviously not OEM, but were $20 total for both sides of the diff (I think I bought 20 bolts)
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Old Fri, Dec-08-2017, 11:03:24 PM   #16
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Default Re: M3 axle bolts, stock are longer???

BMW switched away from allen cap bolts in favor of E-Torx. They easily deform and strip out. I would stick with E-Torx.
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Old Fri, Dec-08-2017, 11:04:47 PM   #17
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Default Re: M3 axle bolts, stock are longer???

True, and a fair point.
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Old Sat, Dec-09-2017, 07:49:16 PM   #18
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Default Re: M3 axle bolts, stock are longer???

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Originally Posted by Bimmerman325i View Post
Yup, those bolts are expensive.

I went with a set of bolts from McMaster, because $20 for a bolt is ridiculous.

pics from build thread:





These are obviously not OEM, but were $20 total for both sides of the diff (I think I bought 20 bolts)
Hey so it looks like ONE of the old bolts you removed was the newer style!
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Old Mon, Dec-18-2017, 03:06:52 AM   #19
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Default Re: M3 axle bolts, stock are longer???

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Originally Posted by Braymond141 View Post
BMW switched away from allen cap bolts in favor of E-Torx. They easily deform and strip out. I would stick with E-Torx.
Almost every other manufacturer with this style of axle uses Allen cap bolts. They're fine as long as you use the correct Allen and seat it fully. I switched to them also because I got them for the GKN axle and bearing facility my buddy works for and were at a 5 finger discount. They're also easier to access because you the Allen socket gives more room from the boot.
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Old Mon, Dec-18-2017, 03:12:33 PM   #20
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Default Re: M3 axle bolts, stock are longer???

You can get a complete set with reinforcement plates from ECS for 134.00

https://www.ecstuning.com/b-genuine-...33211227664kt/
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Discussing M3 axle bolts, stock are longer??? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)