Help needed - flange bolts for LSD

filip00

Hi everyone, help needed. I did the OS Giken LSD installation this weekend and all was going well until the very last moment when I was completing the installation.
As I have the sport package with VLSD, I have different flanges on the driver and passenger side - so I changed 1 flange in order to have it all fit perfectly. All was good until when I wanted to bolt the half-shaft to the flange - the screws don't fit! The problem is that the original flange just has holes and the bolt goes through and bolts to the half-axle. The new flange has threaded holes! Which means my bolts can't go through it - bolts are threaded only 3/4 way in.
I called Nissan but they don't have these bolts in stock and it seems their bolts are the same as my bolts.

Should I just go to the hardware store and buy 6 new bolts with the appropriate dimensions? Should I look for a different part number?

Please help and thanks!

Pic for reference, my bolt looks like this, and I need new ones with thread all the way through: https://neryungri.griffin24.ru/uploa...ff6c982e9.jpeg

**update, solution**

I managed to find a similar thread with right this problem and explanation:

2017 to 2009 6MT Diff Swap - Install Notes

Apparently newer model Z's have these threads reversed. It is *never* threaded on both sides, only one side needs to be threaded and this is why the bolts will always have 3/4 threads, not full.

So old Z models:
Flange hole, half-axle threaded.
Newer Z's:
Flange threaded, half-axle hole.

Happy to know the whole issue now. So I will definitely drill the thread in the halfaxle and use the new thread in the flange and that's that.

Rusty

Nissan for some reason used 2 different types of bolts for the axle half shafts. One being a through bolt that threaded into the flange. The other being a bolt and nut. Z1 has what you are looking for.


https://www.z1motorsports.com/search...20bolts&m=370Z

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filip00

Hey Rusty, thanks for the quick reply.
The bolts that you posted are still not fully threaded my bolts are exactly as the ones on the link (attached). This will likely not resolve the problem as I need the bolt to be fully threaded - whatever isn't threaded, would be left sticking outside the flange

Attached Images

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filip00

OK so to update - apparently there is very little chance I'll find the bolts necessary with full thread and the required strength to keep this solid. Not to mention delivery times...

So I decided to drill out the unnecessary thread from the flange. This will revert the situation to "standard" and I'll keep the original bolts. The only problem now is that I managed to mount the diff back to the car and these holes are now hard to access...and I *really* don't want to drop the diff again.
So the question now is - is it a problem to drill the holes on the half-shaft side and keep the threads on the flange side? This means the bolt will be threaded from a different side, but basically all else will be the same. The bolt head will only be a bit trickier to access, but nothing problematic. Am I missing some other problem with this or would this work? Thanks.

Averying

Sound like it won’t be a problem, as long as the thread engagement on the flange side is the same as on the half-shaft side.

Torque it to spec, throw a little loctite on there if you want and I wouldn’t expect any issues.


Sent from my iPhone using Tapatalk

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filip00

Thanks a lot for the follow up. I managed to find a similar thread with right this problem and explanation:

2017 to 2009 6MT Diff Swap - Install Notes

Apparently newer model Z's have these threads reversed. It is *never* threaded on both sides, only one side needs to be threaded and this is why the bolts will always have 3/4 threads, not full.

So old Z models:
Flange hole, half-axle threaded.
Newer Z's:
Flange threaded, half-axle hole.

Happy to know the whole issue now. So I will definitely drill the thread in the halfaxle and use the new thread in the flange and that's that.

filip00

Conclusion - drilled the half-axle as it was the easiest and screwed it all together the other way around. Works well, bolts are even easier to access than from the diff side. Went out for a test drive, did a few donuts until I was covered in smoke and went home. All good