Another 6 speed bites the dust.
11-08-2013, 04:55 PM
#222
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Join Date: Jul 2005
Location: Anacortes, WA
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Rebuilding a 6 speed Got to the point of trying to press on the 6th gear clutch hub. I had noticed the end of the counter shaft had threads in the end of it and figured it would be easy to come up with a tool to tread in there and press the thing on.
Couldn’t find a bolt that fit the threads though. As near as I can tell they are 9mm left hand threads. Pretty much non existent off the shelf. I called Mazdamotorsports about the SST 49-N017-2A0 Clutch Hub Installer. Said it was ~ $90 special order 4 to 6 weeks for delivery.
How are other people getting that thing on? I think I might be able to press it on by somehow supporting the other end of the shaft up in the flywheel housing as I’m pressing on it which is what I’m leaning towards trying.
Couldn’t find a bolt that fit the threads though. As near as I can tell they are 9mm left hand threads. Pretty much non existent off the shelf. I called Mazdamotorsports about the SST 49-N017-2A0 Clutch Hub Installer. Said it was ~ $90 special order 4 to 6 weeks for delivery.
How are other people getting that thing on? I think I might be able to press it on by somehow supporting the other end of the shaft up in the flywheel housing as I’m pressing on it which is what I’m leaning towards trying.
Last edited by bbundy; 11-08-2013 at 06:37 PM.
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11-09-2013, 01:28 AM
#225
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I'm going to try heating the clutch hub in the oven and whacking it on while supporting the other end of the shaft so as to not side load the roller bearings.
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11-11-2013, 02:01 AM
#233
Thank you.
Well one/two more questions for the road.
I have a 1994 supercharged set-up. I am installing this 6-speed tranny and I also have a 4.1 Torsen. Would this be enough for a street use and spirited driving activities? Or since I'm there, a 3.9 FGR will be worth it?
Tnx again!
Well one/two more questions for the road.
I have a 1994 supercharged set-up. I am installing this 6-speed tranny and I also have a 4.1 Torsen. Would this be enough for a street use and spirited driving activities? Or since I'm there, a 3.9 FGR will be worth it?
Tnx again!
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11-11-2013, 11:32 AM
#234
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Join Date: May 2008
Location: Grants Pass, OR.
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3.90 well give you a little better rpm, thus gas mileage on the highway, other then that there is no real reason to change it. The 6 spd has a really low first gear so no real need for the 4.10. But unless you're bored or can't make the end of the straight at the race track i'd leave it be for the little gain.
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11-11-2013, 12:42 PM
#235
Thank you.
Well one/two more questions for the road.
I have a 1994 supercharged set-up. I am installing this 6-speed tranny and I also have a 4.1 Torsen. Would this be enough for a street use and spirited driving activities? Or since I'm there, a 3.9 FGR will be worth it?
Tnx again!
Well one/two more questions for the road.
I have a 1994 supercharged set-up. I am installing this 6-speed tranny and I also have a 4.1 Torsen. Would this be enough for a street use and spirited driving activities? Or since I'm there, a 3.9 FGR will be worth it?
Tnx again!
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11-11-2013, 05:19 PM
#236
Was just thinking about this again and it occured to me, what exactly are the ideal gear ratios for a track driven miata. Obviously there are lots of variables such as engine power, redline, diff ratio, tire size etc and even the track in question.
But many of the higher horsepower setups are relatively similar 15 inch wheels with 225/45 tires. 3.6 or 3.9 rear end ratios, 300-350hp, shift points around 7500rpm or so depending. similar to Bob's setup.
If you got to pick the ratios for a 5 or 6 speed what would they be. Obviously they might be different for track,autocross or a street car that is occasionally tracked. Many have pointed out that most of the tranny swap options have shitty ratios, so what would your ideal ratios be? Higher first gear, how tight of a spread across the ratios?
Sorry just seemed like it would be easier to define what was desired and then look for something.
But many of the higher horsepower setups are relatively similar 15 inch wheels with 225/45 tires. 3.6 or 3.9 rear end ratios, 300-350hp, shift points around 7500rpm or so depending. similar to Bob's setup.
If you got to pick the ratios for a 5 or 6 speed what would they be. Obviously they might be different for track,autocross or a street car that is occasionally tracked. Many have pointed out that most of the tranny swap options have shitty ratios, so what would your ideal ratios be? Higher first gear, how tight of a spread across the ratios?
Sorry just seemed like it would be easier to define what was desired and then look for something.
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11-11-2013, 05:56 PM
#239
I am in the same boat, i pulled my 6speed apart last night and it needs some new synchros and sliders and forks ect... the parts are gonna be over $1500, so im just gonna buy another tranny.
It doesnt make sense to spend 1k on a 75,000+ mile miata box when i can spend $800 on a 15,000 mile RX8 box. Has the internal swap actually been done?
It doesnt make sense to spend 1k on a 75,000+ mile miata box when i can spend $800 on a 15,000 mile RX8 box. Has the internal swap actually been done?
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11-11-2013, 06:06 PM
#240
Rebuilding a 6 speed Got to the point of trying to press on the 6th gear clutch hub. I had noticed the end of the counter shaft had threads in the end of it and figured it would be easy to come up with a tool to tread in there and press the thing on.
Couldn’t find a bolt that fit the threads though. As near as I can tell they are 9mm left hand threads. Pretty much non existent off the shelf. I called Mazdamotorsports about the SST 49-N017-2A0 Clutch Hub Installer. Said it was ~ $90 special order 4 to 6 weeks for delivery.
How are other people getting that thing on? I think I might be able to press it on by somehow supporting the other end of the shaft up in the flywheel housing as I’m pressing on it which is what I’m leaning towards trying.
Couldn’t find a bolt that fit the threads though. As near as I can tell they are 9mm left hand threads. Pretty much non existent off the shelf. I called Mazdamotorsports about the SST 49-N017-2A0 Clutch Hub Installer. Said it was ~ $90 special order 4 to 6 weeks for delivery.
How are other people getting that thing on? I think I might be able to press it on by somehow supporting the other end of the shaft up in the flywheel housing as I’m pressing on it which is what I’m leaning towards trying.
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