Miata Turbo Forum - Boost cars, acquire cats. - Quickie: What size are the propshaft to diff bolts?

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cardriverx

11-19-2011 01:48 PM

Quickie: What size are the propshaft to diff bolts?

Hey guys, so after I got my transmission in I noticed how undersized my 4 propshaft - diff bolts are. I know there was some discussion about how this does not matter, but I don't see how they wouldn't take a shear load (no keyway to anything to prevent it). So, I don't feel comfortable with undersized bolts. Plus when I took em out, they were loose, and I know I tightened them before. So I need new bolts anyway.

Does anyone know the I.D of the bolt holes so I can go get some bolts?

Thanks fellas!

crashnscar

11-19-2011 06:04 PM

I do not, but I know that your average hardware store probably won't have something that fits right. The OEM mazda bolts have a shoulder near the head so they fit snug. You likely have 1.6 bolts in your 1.8 driveshaft/diff (or hardware store crap).

Rennkafer

11-20-2011 10:28 PM

Quote:

Originally Posted by crashnscar (Post 797115)

You likely have 1.6 bolts in your 1.8 driveshaft/diff (or hardware store crap).

^This... the 1.6 bolts are 8mm, 1.8's are 10mm. I'd try to find some stock 1.8 bolts.

cardriverx

11-21-2011 09:39 AM

Quote:

Originally Posted by Rennkafer (Post 797517)

^This... the 1.6 bolts are 8mm, 1.8's are 10mm. I'd try to find some stock 1.8 bolts.

M10, awesome thanks. Plus 1 for you.

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