Anyone ever "fix" a scratchy synchro with fluids? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-21-2012, 10:34 PM   #21
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Just switched to MTG in my 6speed as of 30 min ago: already feel a difference. Feels Goodman
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Old 11-22-2012, 04:04 AM   #22
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Quote:
Originally Posted by hustler View Post
...the AMSoil MTG is for extreme use, Motorcraft and Synchromesh for dialy driving.
Has anyone proven this with a UOA?

My Motorcraft fluid shifts *much* better on the track than the GM Friction Modified fluid which made shifts into 3rd a crunchy mess. I'm tempted to try the AMSoil MTG but I'm reluctant to abandon something that works for me.
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Old 11-22-2012, 10:53 AM   #23
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hustler, is this your daily or your race car?

If daily, the BG SynchroShift is also pretty smoov.
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Old 11-24-2012, 03:06 PM   #24
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Daily. I may try that, but I'm really tempted to dump this off and consider it "experience". $600 down the *******.
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Old 11-24-2012, 03:19 PM   #25
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what does it do specifically? Grind? Tough to push it into the gate?

Mine is an absolute clunk box when its cold. I have to seriously put effort into shifting smoothly, but when I do, its totally fine. I'd keep revs from dropping too fast between shifts and that seems to avoid any notchi-ness or roughness. It doesn't grind though, just tough and rough switching between gears.

When its up to temp it shifts like butter. Flawless.

Is yours the same way or always clunky?
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Old 11-24-2012, 03:40 PM   #26
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Quote:
Originally Posted by 18psi View Post
what does it do specifically? Grind? Tough to push it into the gate?

Mine is an absolute clunk box when its cold. I have to seriously put effort into shifting smoothly, but when I do, its totally fine. I'd keep revs from dropping too fast between shifts and that seems to avoid any notchi-ness or roughness. It doesn't grind though, just tough and rough switching between gears.

When its up to temp it shifts like butter. Flawless.

Is yours the same way or always clunky?
I basically have to shift without the clutch when cold and 3rd gear always grinds miserably on the downshift. At this rate and severity, the trans won't last long.
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Old 11-24-2012, 05:15 PM   #27
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Any chance the previous owner put something too snotty in there? I'd say it's worth the cost of a trans fluid flush and a refill with one of the synchro fluids.
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Old 11-24-2012, 06:48 PM   #28
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Any chance the previous owner put something too snotty in there? I'd say it's worth the cost of a trans fluid flush and a refill with one of the synchro fluids.
It's already been flushed. I started with cheap-o synchromesh. Junk oil from the old trans I pulled, drove it for a week, swapped to MTG.
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Old 11-24-2012, 07:26 PM   #29
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Once a synchro is worn enough that it no longer has the ability to act as a brake and slow the gear, there's no reviving it with fluid. You can potentially change the way the trans feels/shifts with a different viscosity gear oil, but if the synchro is worn out and grinding, it's done. There is literally material worn away from the inner contact area, or the teeth are deformed enough, that it can't function properly any more.

And make sure your clutch is properly adjusted. I'll assume you know how to do that and that your clutch is not dragging. Which is the #1 killer of synchros.
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Old 12-03-2012, 02:50 PM   #30
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you could try some synchromesh fluid, but the reality is even if it helps at all, it is a bandaid. you could also try revmatching your downshifts to help with smoother engagement.
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Old 12-03-2012, 04:13 PM   #31
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Quote:
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you could also try revmatching your downshifts to help with smoother engagement.
Oh god, are you serious? Could I really try that?
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Old 12-03-2012, 04:30 PM   #32
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Quote:
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Oh god, are you serious? Could I really try that?
hahaha!
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Old 12-03-2012, 05:03 PM   #33
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Quote:
Originally Posted by hustler View Post
Oh god, are you serious? Could I really try that?
Are you serious? Why the sarcasm? You are asking if a fluid could fix your trans... All I was doing was making a suggestion. Lighten up. I didn't say it in a condescending way. Why ask questions and then **** on the answers? We ALL know if the trans is acting as you describe the only real fix is to replace the failed parts. Maybe next time just don't reply to posts that you think are stupid? Sorry if I am coming off as a dick, I just don't understand why people ask questions then get pissed off when they don't get the type of answers they want. Feel free to weed out / delete my posts if you find them unrelated or not helpful in any way.

Last edited by acorn; 12-03-2012 at 05:13 PM.
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Old 12-03-2012, 05:28 PM   #34
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Quote:
Originally Posted by acorn View Post
Are you serious? Why the sarcasm? You are asking if a fluid could fix your trans... All I was doing was making a suggestion. Lighten up. I didn't say it in a condescending way. Why ask questions and then **** on the answers? We ALL know if the trans is acting as you describe the only real fix is to replace the failed parts. Maybe next time just don't reply to posts that you think are stupid? Sorry if I am coming off as a dick, I just don't understand why people ask questions then get pissed off when they don't get the type of answers they want. Feel free to weed out / delete my posts if you find them unrelated or not helpful in any way.
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Old 12-03-2012, 08:08 PM   #35
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As much as I would like to say some smart *** comment, I will refrain. We are all enthusiasts here, and interenet bs aside, no one like busted cars. I hope you sort out your trans problems. Take care.
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Old 12-03-2012, 10:19 PM   #36
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Quote:
Originally Posted by acorn View Post
As much as I would like to say some smart *** comment, I will refrain. We are all enthusiasts here, and interenet bs aside, no one like busted cars. I hope you sort out your trans problems. Take care.
I can translate sarcasm for you:

Quote:
Originally Posted by sarcasm translator
We already had deep conversations about synchromesh fluid and how it was already in this trans at one point and you'd have known that if you had spent more than two minutes replying to 10 threads.
This is why I called you out on it in the for sale thread. Because it's annoying and most people don't have the patience to deal with people who come here to post a bunch of one-liners that are barely relevant just so they can ***** their car parts without otherwise participating.
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Old 12-03-2012, 10:48 PM   #37
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Actually the original problem lies in the fact that i was on my phone and i did not realize this thread had 2 pages so i missed the whole mention of synchromesh. I was not spamming. I personally used synchromesh with good results on one of my previous cars so i suggested it.
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Old 12-04-2012, 01:21 PM   #38
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I had no luck with additives. I had to replace tranny in my 99. Had to put it on blocks, took 1 day to remove and replace. Wasn't too bad.
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Old 12-04-2012, 01:36 PM   #39
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The vast majority of "bad syncros" are actually the result of a bent shift fork. Its pretty unusual for a syncro in a good, modern transmission to just get shitty out of nowhere. Typically a shift fork gets bent, it starts grinding, then after a year of that ****, the syncro is torn up so when someone opens the transmission they go "oh, look at dat der syncro dats all tore up, ders yer problem".
So no, I dont think any kind of fluid is going to help. Going to a different weight might make it shift better so you dont bend the fork in the first place, but thats about it.


In the mean time, double clutch...
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Old 12-04-2012, 02:52 PM   #40
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Did Motorcraft change their labeling on the MTX bottles?

Bought a shelf full of what the counter guy says is the right stuff. The part number contains MTX but the label just says synthetic transmission fluid.
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