Hmmm....so the PPF may be a cause?

The "BB code" link. Copy and paste it:
https://www.miataturbo.net/picture.p...pictureid=2406

https://www.miataturbo.net/picture.p...pictureid=2407


noticed this on my nice new trans, thinking of splitting the case just to see what is going on inside.

Stop spreading bullsh*t. The older M.NET threads speak about 2 failures over the last 5 years in non-Miata applications.
Yes, they are not cheap to get, they not cheap to get in your trans but have not broken under power in a Miata application.

No, read up on the old M.NET thread. During the Quaife gearset development they checked for case flex and was found to be a non-issue.

anyone have pictures of the bare gears? they look sleeved. has anyone attempted to do a rebuild at home?

Beyond the obvious, you'll probably need a press and gear/pulley remover. I have not seen any pics of a disassembled Miata trans or individual gears, but here's a link to manuals with exploded views: http://www.mazdaspeeddevelopment.com...miatapubs.html Otherwise take a bunch of pics of specific bits if orientation is not obvious. For example, in DSM trannys some parts fit in the clusters both directions and seem to be correct, but only work properly one way.

yeah lots of pictures for sure, but for some reason I never get the pictures I need.

I think the disassemble will be a learning exercise more then anything. several gears have chips so I don't think it will be economical to repair.

I'm going to stop by a place that makes gears for industrial applications perhaps the can make me some super strong gears might be cost prohibitive but it does not hurt to ask

so I was expecting the worst but this 6 speed seems super clean and seems to shift great. The inner shift boot was toast so I replaced it and the linkage bushing from the 5 speed and bolted it up. I also ordered a ebay shift knob for the miata, because my old momo king knob always loosens up.

anyway so far I dont see what all the fuss is about. shifts just fine, but as others have said, it can be hit or miss. for once looks like I caught a break.

Yeah, mine shifts fine as well. It's not exactly like the 5-speed, but it's a lot better than I expected.

6-speeds shift fine. Anyone who thinks they are crappy should go drive any BMW.

6-speeds with good gear oil in them shift fine. With shitty oil they can be a pita.

FYI for those that dig up this post, I hated the 5 speed when I got the car, it did not feel right, I took off the light weight shift knob and put on an old heavy momo king knob at a slightly higher position. I could not believe how much a difference this made. about 1/2 inch higher knob and a heavy knob vs a light one changed everything for me and I loved how the car shifts. so just something to consider if you don't like how the car shifts. just get something heavy and and slightly taller and all is well. also someone on ebay sells a shift knob spacer that might help if you run a supper low, light knob with a short shift kit.

the oil that came out of my 5 speed looked like muddy ---- water. the fluid that came out of the 6 speed looked new. I hope the previous owner did a rebuild and promptly crashed his car.

I know exactly what you mean. The oil that came out of my 5-speed looked like a chocolate milkshake :barf:

yeah not sure if that means the oil breaks down due to heat and then is filled with metal or if it is just filled with contamination and little pieces of metal. I know they make heavy gear oil like 74/140, it would be interesting to run this see what happens. I did not feel like screwing around, trying to trouble shoot but I will post the results of the blackstone oil test when i get them back in a couple weeks.

In your new to you 6-speed the consensus is to run Amsoil. If you need a hook-up on it shoot me a pm and I can get you in contact with someone who sells it.

to get the car running I used redline that came with the car so I can make sure everything works, I'm going to order engine oil and trans and diff oil soon and I would like to get the amsoil and the motul oil from the same place if possible. lll pm you. thanks

the car shifted fine with the engine off. I drove the car and it was really bad in to 5, 6 and R. I changed out the shift knob, for the big heavy momo king i have and tried it again. It shifted fine into all gears. the slightly higher position and the heavy knob made a big difference. point is, if you have trouble with a 6 speed, get a heavy knob and figure out a way to make it sit a bit higher. I was starting to freak a little but it just goes to show, little changes can make a big difference.

AND... I just blew my 5 speed too :vash:

Any tips on where to find a 6 speed quick? I've got a race next weekend.