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Old 04-22-2010, 02:35 PM   #1
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Default Who has broken a 6 speed?

Mine is starting to make bad noises at high revs in 3rd and 4th. Sounds like gear teeth rattling.

Curious if it was the sound of eminent failure.

Bob
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Old 04-22-2010, 02:49 PM   #2
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thesnowboarder just broke one.

Bob, parts are cheap. I paid $360 in labor and $250 in parts to have my 5/R shift fork, selector, reverse synchro and gear replaced over the winter. Open it up and have it looked at before something goes really bad and wrecks multiple gears.

Sounds like I need to find a spare gearbox.
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Old 04-22-2010, 03:23 PM   #3
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Quote:
Originally Posted by Savington View Post
thesnowboarder just broke one.

Bob, parts are cheap. I paid $360 in labor and $250 in parts to have my 5/R shift fork, selector, reverse synchro and gear replaced over the winter. Open it up and have it looked at before something goes really bad and wrecks multiple gears.

Sounds like I need to find a spare gearbox.
.........and I've got a crap load of used six speed internal parts that I'll sell for cheeeaaaaaap to get them out of my garage. The areas of concern are in the group of parts I have.


Sav:

Under what conditions was snowboarders six speed when he broke it???
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Old 04-22-2010, 03:49 PM   #4
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i think he downshifted to 3rd....and CABLAM!
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Old 04-22-2010, 08:24 PM   #5
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Is there a shop out there in Miataland that knows the ins and outs of building a stronger 6spd box?
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Old 04-22-2010, 09:16 PM   #6
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Downshifted to 4th and it let go. He hasn't opened it yet.

Jay, nobody makes/builds a stronger 6-speed box except the MSM boxes with the shotpeened gears. TSB is the first one I know of to fail during road course use. My box looked perfect when I had it open. If I do start breaking stuff, just start filling it with MSM gears.

If the gearbox lasts 2 years at these power levels, that's acceptable to me.
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Old 04-22-2010, 09:21 PM   #7
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oh yeah! it was 4th, my bad.......
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Old 04-22-2010, 10:29 PM   #8
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You guys need to stop this thread.... especially as i just tossed a 6spd in a week or so ago.

Then again... I don't plan on power enough to break a 5spd.... so i better be safe
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Old 04-23-2010, 03:03 AM   #9
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Bob I have a 6 speed with a broken housing let me know if you need some parts.
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Old 04-23-2010, 04:02 AM   #10
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I too just installed a 6 speed after blowing my 5 speed so fingers crossed!
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Old 04-23-2010, 04:11 AM   #11
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I should have the new motor in with the 6 speed in a couple weeks, tranny should be broken not long after that I imagine lol.

On a side note, none of my 5 speeds made any noises before breaking.
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Old 04-23-2010, 09:47 AM   #12
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I have 16-hours on my 6-speed at 250whp and although I haven't had the best lap times in the world, the car is driven like a warrior. I have no symptoms or noises of any kind.

I also have a metal clutch...which needs to come to an end. TheSnowboardingQueer also had about 300whp if not more going through the trans too.
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Old 04-26-2010, 01:03 PM   #13
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My 6 speed is making rattly gear stripping noises at high revs in second and 3rd gear maybe 4th too.

The 5 speeds I have broken 3 different ways. Stripping second or third was just a loud bang at full acceleration right about the point in the RPM range where I am making peak torque. The ones I broke the gear that drives the secondary shaft on all would make loud squealing noises on coast down after a hard use for a little while before Kablamo.

I need to get a spare before I take this one out and try and figure out what’s going on.

Dang it, driving a Miata this fast is expensive. I can’t afford some of the upgrades I want if I keep spending so much money keeping it rolling.

Bob
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Old 04-26-2010, 01:08 PM   #14
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Quote:
Originally Posted by 90GTK450 View Post
Bob I have a 6 speed with a broken housing let me know if you need some parts.

I might be interested in that. I need to get a spare first and I got to save up some cash flow first.

I got another 5 speed I can throw in if I have to for a couple weeks if it goes Kaboom.

Bob
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Old 04-26-2010, 01:11 PM   #15
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Quote:
Originally Posted by Splitime View Post
You guys need to stop this thread.... especially as i just tossed a 6spd in a week or so ago.

Then again... I don't plan on power enough to break a 5spd.... so i better be safe
Neither did I, but i somehow blew my 3rd gear @ 9psi on an sr20 turbo (2554) I would say sub 180whp. Now I'm blowing 4th in a 6-speed.

Quote:
Originally Posted by bbundy View Post
Dang it, driving a Miata this fast is expensive. I can’t afford some of the upgrades I want if I keep spending so much money keeping it rolling.

Bob
Truth.

Video of said blown 6-speed:
http://www.youtube.com/watch?v=c4nD0-FNiH0



I guess ill yank it out this week and see what kind of damage happened. To be fair to the transmission, I do not treat is nicely, lots and lots of fast/hard shifts. I can say i never really did a stand still burn out or clutch popping on it though.
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Old 04-26-2010, 03:06 PM   #16
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Mike blew one up at TWS this weekend.
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Old 04-26-2010, 03:09 PM   #17
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Doing what? Hardparking in the paddock? Making 900whp Mile passes? Please don't tell us, I thrive on suspense.
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Old 04-26-2010, 03:09 PM   #18
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Quote:
Originally Posted by jacob300zx View Post
Mike blew one up at TWS this weekend.
**** **** ****. How can the MSM trans be identified?

How much power is Mike putting down? Metal clutch?
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Old 04-27-2010, 02:11 AM   #19
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what happened to the shot peened gears on all 6 speed 01+ trannies theory?
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Old 04-27-2010, 02:32 AM   #20
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Quote:
Originally Posted by frostyllama View Post
what happened to the shot peened gears on all 6 speed 01+ trannies theory?
For what its worth, i have a 10AE tranny out of a 99.
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