How much noise is a 5-speed supposed to make?
 

Ever since I replaced my clutch and transmission fluid a couple months ago, my transmission has been whining. I'm using the Ford MTX fluid, and I put in an FM stage 1 clutch. Did I do something wrong or is the new fluid making it whine or something?

I can only hear it at low speeds, or when in neutral with the clutch out. It's not really loud, but I'm pretty sure it wasn't ever this loud before. This transmission has about 55k miles, and about 3k of those are turbo'd.

my buddys 5 speed makes all kinds of racket but he has almost 200k miles on it and i am sure it is more than alil worn in the synchros etc.

Bearings make noise when cruising, not synchros.

His shit makes noise all the time while i dont think he has any real bearing damage i told him to be on the look out for a 6 speed or a better 5 speed.

Bearings get loud, it happens. My 5-speed in the daily was previously owned by a drifter, the trans is loud, and has been for the last 40,000 miles. My 6-speed is pretty loud too. Put a spare in the garage, you may never need it.

So I should just keep driving it and hope? Is there some common mistake while changing fluid and clutch that would cause this noise? I'm pretty sure it started suddenly.

Check the oil level, and if it's full, keep driving. I think AMSoil MTG is thicker than Motorcraft, but it doesn't matter and I wouldn't waste time if it were my daily.

Also could be your throwout bearing... My brother installed a cheapie that came a w/ a oe parts store clutch and its loud now. (we didn't know better) push the clutch in and it shuts up. Trick is to get the $50 one from mazda.

I can do gearbox work. Not a lot of guys can do it at home, but I would still buy a healthy box for a daily once the old one broke every time, its not worth the hastle or money to pay someone to put a new set of bearings through it.
So yeah, what hustler said.

Dann

did you correctly align the box with the PPF before torquing up?

Generally it only effects the box when in overrun, but if yours is badly out it could effect it all the time.

align? I guess I would say no... How would I align them more than just putting the bolts in?

does it sound like this:





if not does it sound like an RC car motor, and if so, does it happen in 4th gear?

The transmissions that I broke the drive gears for the secondary shaft all squealed shortly before they went. Think I've broke 3 of them like that. loos every gear but fourth. I think it is a bearing in the transmission that allows the shafts to separate a bit when it goes out and then the teeth break as they get more tip loaded.

Bob

I broke one just like this. They will squeal and holler before they let go from bearing failure. I used a quart of lucas oil stabilizer, and a quart of their regular old gear oil, and mine shut up. This isn't conventional miata wisdom, but hey.

How to do it is in the Miata manual Brain hosts in the useful saved posts area, it's very simple to do, just jack the tail of the box up to a certain height in relation to the frame rails. There's a large-ish tolerance but not enough to cover the tail dropped as far as it can attached to the PPF.

It sounds a lot like that in neutral, and and RC car motor in first and second, but then after that it's not loud enough to hear over road noise.

that noise was all because i failed to grease anything when i installed.

it's the sound of the TOB rattling on the fork.


if the whine goes away in 4th gear, it's internals.

What was I supposed to grease? I put some on the input shaft, but I think that's about it.

yeah.

FSM shows the:

Fork pivot joint
Fork "fingers" where the TOB sits
Input shaft
TOB "guides" the hold to fork


http://www.boostedmiata.com/gallery2...ase_points.jpg
http://www.boostedmiata.com/gallery2...se_points1.jpg


I have yet to grease the springs on the disc, but i see that as well.


After doing those spots, I have no more clutch noise.

Damnit. Pulling that shit off again is going to suck, especially just to grease it. At least this time the exhaust should be pretty easy to get undone.

i mean, listen at idle and push the clutch in and see if it goes away. it shouldnt make any noise while driving.

I had the exact same noise as Brainy after putting in an ACT XT. I do recall greasing all the recommended points. My 5 speed blew up over 20k miles later, most likely due to 240whp.

This.

4th gear is straight through input to output 1:1 and dosn’t load bearings. everything sends torque through a secondary shaft and loads bearings.

Mine would squeal at light load after a flog session, usually coming off the track or at the end of an autocross run. After a little while a big bang would leave it with no drive in any gear but 4th. I have also broken second gear and 3rd gear only in other transmissions and when that happens it didn’t squeal prior to failure. I’ve broken 7 of them with 3 different failure modes. I havent thoroughly investigated but I think the squeal could possibly be from a chiped gear tooth getting stuck in a bearing and the race spinning.

Bob

Mine makes noise in neutral AND while moving, but not with the clutch in and the car stationary. I will see if I can get a video of it tomorrow or something.

Mine does this. Held longer than my engine at my power level...

Is it more of a whine or does it sound like a "big ass cricket"?

https://www.miataturbo.net/general-miata-chat-9/clutch-squeaks-after-long-drive-45805/

Less noise than a freight train and more noise than a sleeping kitten?

I thought that 5 speeds were so cheap that you were supposed to swap it out each time you miss a shift?