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3.63 ring and pinion SHIMS.

Old 11-08-2018, 11:03 PM
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Default 3.63 ring and pinion SHIMS.

New here. I have a 3.63 ring and pinion ready to go but my mechanic says I'll need new shims/spacers. And I cannot for the life of me find a retailer who sells the shims/spacers or whatever. My Mazda dealer says they're no longer available. And I found a kit from Mazmart that comes with the seals and the ring and pinion but excludes shims. If anyone could direct me to a retailer who sells shims for the pinion, please share.

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Old 11-09-2018, 12:06 AM
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Stock setup actually uses a crush sleeve instead of a solid spacer. I've never purchased one of those new, so maybe someone else will chime in about ordering one.

When I bought my OS Giken, I elected to use this kit from Weir Performance that replaces it with a solid spacer and shims. He still sells them.

EDIT: TNTUBA has a good list of the OE part numbers.

Originally Posted by TNTUBA View Post
M035-27-171 - Pinion Sleeve $19.00

M025-27-210 - Pinion Bearing $58.89

0223-27-401A though 0223-27-415A Pinion Depth Spacers in .03mm incriments starting with 3.08mm and ending with 3.47mm @ $10 each

8051-27-235(10,2mm) OR 8051-27-236(10,0mm) Ring Gear Bolts $5.50 each
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Old 11-09-2018, 12:10 AM
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Really? Because I found someone online who was using a 3.275mm spacer... So that kit you got negated having to get shims?
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Old 11-09-2018, 12:13 AM
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I bought mine through mazda motorsports when I built mine. If Mazda stopped making it, that won't work though. I bet it's possible the parts guy didn't know how to find it.

Actually, I lucked out and needed the exact same size it had already. But I was ready to order a new one. You'll need to know what size shim you need to order it.
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Old 11-09-2018, 12:16 AM
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My parts guy found them all. And my college (who is doing the work) instructor refused to open the diff until I had all the parts... Soooo I was just going to order all the shims. I know it's a waste but it's what I had to do (saving TONS from having the college do it) and he started to order them and it said they weren't available to order anymore. And I looked at Mazda motorsports but couldn't find them. Maybe they call them spacers instead of shims. I'll re-look.
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Old 11-09-2018, 04:42 PM
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There are no shims. Is a crush sleeve.

You need this:

https://www.ebay.com/itm/Miatamecca-Differential-Distance-Crush-Collar-94-05-Mazda-Miata-MX5-M03527171-/391459178976



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Old 11-09-2018, 04:47 PM
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Originally Posted by SPIDEY CY View Post
There are no shims. Is a crush sleeve.

You need this:

https://www.ebay.com/itm/Miatamecca-Differential-Distance-Crush-Collar-94-05-Mazda-Miata-MX5-M03527171-/391459178976
The crush sleeve sets pinion bearing preload. The shims set the spacing of the pinion to the ring gear and sets the wear pattern.
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Old 11-09-2018, 09:42 PM
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Originally Posted by AutoFreak57 View Post
The crush sleeve sets pinion bearing preload. The shims set the spacing of the pinion to the ring gear and sets the wear pattern.
So I do need shims?
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Old 11-09-2018, 11:02 PM
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Originally Posted by MturboMiata View Post
So I do need shims?
Yes. 1 shim goes on the pinion. You might luck out and can reuse the stock one. But likely need a different thickness.
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Old 11-09-2018, 11:12 PM
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Originally Posted by AutoFreak57 View Post
Yes. 1 shim goes on the pinion. You might luck out and can reuse the stock one. But likely need a different thickness.
Crap. Well I'll just have to have them open it up and tell me what size shim I need. Thanks for the help everyone
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Old 11-09-2018, 11:22 PM
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The pinions are marked with a code that in indicates where they are on the tolerance range. You can use the difference between the marks to calculate the shim thickness needed.

If you search around for "pinion depth" or posts about swapping the r&p, you should find a guide on it that explains it well. It's been a few years since I did mine, so I'm not sure where it is any more. Figuring out pinion depth was actually one of the easiest parts.
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Old 11-09-2018, 11:27 PM
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Originally Posted by AutoFreak57 View Post
The pinions are marked with a code that in indicates where they are on the tolerance range. You can use the difference between the marks to calculate the shim thickness needed.

If you search around for "pinion depth" or posts about swapping the r&p, you should find a guide on it that explains it well. It's been a few years since I did mine, so I'm not sure where it is any more. Figuring out pinion depth was actually one of the easiest parts.
Okay so basically I don't even have to open up the diff to figure out what shim I'd need? I'm more of a body man not mechanic haha! Trying to learn though!
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Old Yesterday, 01:41 PM
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In my experience (and many others) the gears are built to very tight tolerances and the housings are where most of the variances are. So often times if the shim stays paired with the housing the new gear set will run properly with good engagement marks. I reused the housingís original shim when regearing my diff and itís fine, good engagement pattern, runs nice and quiet.
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Old Yesterday, 01:46 PM
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Originally Posted by themonkeyman View Post
In my experience (and many others) the gears are built to very tight tolerances and the housings are where most of the variances are. So often times if the shim stays paired with the housing the new gear set will run properly with good engagement marks. I reused the housingís original shim when regearing my diff and itís fine, good engagement pattern, runs nice and quiet.
Thanks for the input! I'll let the students know who are doing the work. Worst case scenario they have to wait a bit when they find out if I need some new shims.
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Old Today, 01:43 PM
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So does anyone know the shim inside and outside diameter needed? They keep saying to buy a universal kit but I can't find a universal shim kit for Mazda besides the B2000. Every kit I find is for like gmc Yukons
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Old Today, 01:57 PM
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Look here; https://www.jimellismazdaparts.com/s...ey_model=14360

The shim is part 27401. There are like 25 sizes offered, the only way to determine exactly which you will need aside from trial and error is using the Mazda install tool which I believe is a dealer only tool.
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Old Today, 02:50 PM
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Originally Posted by themonkeyman View Post
Look here; https://www.jimellismazdaparts.com/s...ey_model=14360

The shim is part 27401. There are like 25 sizes offered, the only way to determine exactly which you will need aside from trial and error is using the Mazda install tool which I believe is a dealer only tool.
Yeah I saw that. The professor wants like a "universal" kit and I see the kits from Yukon and some other company but it's like "this is a 7" size" and I don't know what size I'd need. Like the inside and outside diameter that would fit the pinion
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Old Today, 02:57 PM
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Originally Posted by MturboMiata View Post
Yeah I saw that. The professor wants like a "universal" kit and I see the kits from Yukon and some other company but it's like "this is a 7" size" and I don't know what size I'd need. Like the inside and outside diameter that would fit the pinion
What he wants doesnít exist. This is a Miata, maaaybe 5% of owners will actually regear their diffs to something outside of the factory offerings, itís not like a GM 4x4 which sold like 10x as many vehicles, and where 30% of owners are gonna regear for big tires. There is no such thing as a pinion shim kit for these cars.

That said, I do have a spare pinion shim I can measure ID and OD when I get home later, but I doubt it will help. Youíre gonna have to trial and error it and order one from Mazda. Or else order all of them from Mazda and return what you donít need (if you can.)

But all of this will probably be pointless cause the one from the original gearset is almost certain to give correct pinion depth Į\_(ツ)_/Į
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Old Today, 03:21 PM
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Originally Posted by themonkeyman View Post

What he wants doesnít exist. This is a Miata, maaaybe 5% of owners will actually regear their diffs to something outside of the factory offerings, itís not like a GM 4x4 which sold like 10x as many vehicles, and where 30% of owners are gonna regear for big tires. There is no such thing as a pinion shim kit for these cars.

That said, I do have a spare pinion shim I can measure ID and OD when I get home later, but I doubt it will help. Youíre gonna have to trial and error it and order one from Mazda. Or else order all of them from Mazda and return what you donít need (if you can.)

But all of this will probably be pointless cause the one from the original gearset is almost certain to give correct pinion depth Į\_(ツ)_/Į
Slowly finding that out. Thank you so much for the input. I'll probably just end up taking it to a different shop since the school is running out of time
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