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Old 08-21-2009, 05:00 AM   #1
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Ok, so my ACT 6puck clutch install will be starting this saturday or possibly next monday. This whole time my stocker was going out I was hunting around for a replacement transmission. Here are the problems with my current one:

The fluid never had been changed, so I drained it for some Royal purple transmission fluid. Ever since then the car had a transmission leak. Every morning under the car there would be a few drops of transmisison fluid.
Did the new synthetic Royal purple eat away at the seals and cause the leak? No idea maybe some of you will know.

2ng gear grids unless you are real careful and the car is fully warmed up. 3rd gear is finicky but more or less ok. I'm thinking the synchro's need replacing.

So my plan of attack is: take off transmission to replace clutch, and while its off open it up, put in new synchro's and re-seal the whole shebang with the transmission silicone sealant stuff I have left over from the wrx transmission rebuild, as well as use new front/rear seals.

Is this a good Idea?

I've been looking for replacements and just can't afford to drop the 600+ on a 6 speed, and all the 5 speeds I've seen so far are either: 1)high *** mileage beat up ones 2) extremely expensive 3) way far and would be expensive to ship.

So I'll retain mine if I can do what I plan on doing for no more than say 100 bux. Is this possible? Where would I find sunchro's (if at all) and what is the average price? (aside from the stealership obviously).

Any help would be greatly appreciated.
Thanx
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Old 08-21-2009, 06:44 AM   #2
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Deal with your crappy tranny, save your pennies, and get a 6-speed. 5-speeds aren't worth putting a dime into if you are putting more than 200whp to the rear tires.
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Old 08-21-2009, 06:50 AM   #3
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One other option I JUST found is a guy selling one out of a 2000 with 140k miles in supposed good condition for 200 bux.

I don't really mind the finicky gears really. Its the dripping that pisses me off. I'm so tired of scrubbing oil off my driveway. Its a very expensive new concrete driveway and to put a million black oil stains on it is the last thing I want to do.

So not worth it AT ALL to even bother with the 5 speed? That sucks.
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Old 08-21-2009, 11:15 PM   #4
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Started on the transmission today:


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Old 08-22-2009, 02:59 AM   #5
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split and reseal the case and be done with it. alot of tranny repair and rebuild sites offer synchros for like 50-60 bucks.
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Old 08-22-2009, 11:39 AM   #6
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Quote:
Originally Posted by magnamx-5 View Post
split and reseal the case and be done with it. alot of tranny repair and rebuild sites offer synchros for like 50-60 bucks.
Magna,

I need synchros so; would you be so kind as to point to me which tranny repair and rebuild sites offer them?

Thanks

(sorry Vlad for crapping on your thread).
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Old 08-22-2009, 12:27 PM   #7
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hmm well iono **** was easy to find on my nissan but seems scarce for a miata. Try mazda direct then :shrug:
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Old 08-22-2009, 01:43 PM   #8
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Quote:
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hmm well iono **** was easy to find on my nissan but seems scarce for a miata. Try mazda direct then :shrug:
lol. I see your English is improving!

Thanks anyways
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Old 08-22-2009, 05:57 PM   #9
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A little progress:




It appears that the stock clutch is still actually in really good condition. Has plenty of life left on it and is not scarred or burned in any way. I guess the reason it started slipping is due to the pressure plate? I'm thinking my estimated 200 butt dyno whp/tq was just overwhelming the stock pressure plate causing the clutch to slip.

Anyhow, I have not found any place that sells synchro's for this transmission. I am just going to split it like Magna advised, and re-seal the sucker to get rid of the oil leak, as well as replace the front/rear seals.

Here's another question: is Redline MT-90 the best transmission oil to use? I don't track the car and want shifts to be as smooth as possible without messing anything up, should I just get the stock oil from the dealership or use the Redline?
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Old 08-22-2009, 07:43 PM   #10
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Quote:
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Here's another question: is Redline MT-90 the best transmission oil to use? I don't track the car and want shifts to be as smooth as possible without messing anything up, should I just get the stock oil from the dealership or use the Redline?
That question will start a large discussion no doubt It is as contentious as the ol' what engine oil should I use question.

I am using Motul 300 Gear based on Gary's (Track Dog Racing) recommendation; it is not cheap, about $15-$20 a quart and hard to find ad the usual parts stores. Hustler will tell you do not use it.

There is a huge thread on m.n about the awesomeness of a particular Motorcraft transmission fluid with many happy reviews after switching to it. Read through that one... also not cheap, about $20 a quart. You need two quarts. I am about to change my trans fluid and am considering trying it.
Motorcraft Full Synthetic Manual Transmission Fluid - MX-5 Miata Forum
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Old 08-22-2009, 08:09 PM   #11
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i changed my fluid out for mt-90 at around 35K. The original fluid was definitely smoother,came out super clean too, oh well
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Old 08-22-2009, 08:50 PM   #12
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Thanx guys. I think I'll either use that or the stock stuff. I really didn't like the Royal Purple gear fluid that I had in it :/

Some more progress

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Old 08-22-2009, 10:23 PM   #13
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Looks good. I need to get a 6 sp.
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Old 08-23-2009, 02:12 AM   #14
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