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Old 05-12-2016, 07:42 PM   #1
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Default ND transmission failure.

I think I witnessed the first ND transmission failure last weekend. STR prepped ND Miata rolled on the throttle in second gear and crunch no drive in second gear. sounded just like the sound I have herd many times with 5 and six speed miatas with all the teeth stripped off a gear. It was Ron Bauer's ND his codriver was driving.
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Old 05-12-2016, 07:46 PM   #2
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Remind me never to attend an event with you. Transmissions quake in fear and **** their pants merely by being in your presence.
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Old 05-12-2016, 07:48 PM   #3
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Are you beyond the "back to stock" and warranty it point?
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Old 05-12-2016, 07:50 PM   #4
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Not his car.
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Old 05-12-2016, 08:05 PM   #5
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Confirmed, Stripped second gear. I just though it was an Interesting data point on the ND.

Guess that transmission will not like boost. I think it had around 6000 miles on it. autocrosses in C street then converted to STR trim on 245 Rivals. It was fast. Ron had dirty runs in the 55 second range and I was only a second faster in the low 54's with SSM prep.
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Old 05-12-2016, 08:20 PM   #6
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Very interesting. I bet it's weak cause they were saving weight with it too, making the gears just beefy enough to handle the stock power.
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Old 05-12-2016, 08:24 PM   #7
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Wonder if it was part of the bad batch. There was a certain amount of NDs with weak transmissions. Multiple reports of them broken on m.net. Mazda has acknowledged it. Metallurgy reason.
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Old 05-12-2016, 08:29 PM   #8
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Definitely not the first one. There was a big, long thread on M.net about a guy who lunched one in a stock street car while driving it on the street. There was also an uncomfirmed comment by someone that knew someone whose uncle fucked a secretary at Fiat who said that the reason they are using the NC 6-speed in the 124 is because they broke one/several ND 6-speeds during development and Mazda didn't want to fund an additional new gearbox just for the 124 variant.

I expect that you'll see a lot more broken gearboxes as time goes on.
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Old 05-12-2016, 08:31 PM   #9
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So does that mean an NC trans+124 bellhousing will bolt up to an ND motor?
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Old 05-12-2016, 08:40 PM   #10
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I kind of doubt it. The Skyactiv2.0 and Fiat/Chrysler 1.4T both existed before the ND was a thing, so my money would be on the NC 6-sp getting a unique bellhousing that only bolts to the 1.4T.
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Old 05-12-2016, 10:33 PM   #11
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I remember reading metallurgy issue with a batch of gears but I can't remember if there was a source for that or if it was just something someone heard and posted as fact.
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Old 05-12-2016, 10:34 PM   #12
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Quote:
Originally Posted by Savington View Post
Definitely not the first one. There was a big, long thread on M.net about a guy who lunched one in a stock street car while driving it on the street. There was also an uncomfirmed comment by someone that knew someone whose uncle fucked a secretary at Fiat who said that the reason they are using the NC 6-speed in the 124 is because they broke one/several ND 6-speeds during development and Mazda didn't want to fund an additional new gearbox just for the 124 variant.

I expect that you'll see a lot more broken gearboxes as time goes on.
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