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Discussion Starter #1
Posting since it hasn't been revisited in awhile.
I'm sure no one loves the manual transmission. I've posted off and on, mostly in the SOVA thread, about not being able to downshift an not being able to make a full power 1-2 shift without going slooOOW.

Changing my motor oil I decide to try something else having access to just about any transmission fluid on hand.
I settled on syncromesh after some reading, especially on the Tiburon forums.
This stuff here:


So with that massive lead-in I pulled out the shop pulled a full power 1-2 shift and it actually went in. by the time I made my garage i actually made a 3-1 downshift.
Yeah I know, Well I'm excited.

Don't know the long term but the Syncromesh does make a difference.
 

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Discussion Starter #3
What were you using before? I've been running stock fluid so I'm doing my first tranny fluid flush. I went with Redline MT-85.
I changed to Amsoil GL4 about 20k hoping for an improvement. It made none.
I rebuild transmissions, I actually checked to see if any parts had been superseded that I could swap in. Fluid isn't a magic bullet but I don't hate shifting as much.

Update: After driving for awhile the transmission feels "notchier".
Upshifts are better, downshifts are still hit or miss but better.
 

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unce unce unce
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Oh hahaha! I'm so out of it. Could have sworn the "GL4" meant it was tranny fluid. Assumed all tranny fluid was GL4 regardless.

So this new synchromesh seems to be better?
 

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Discussion Starter #7
Most manuals take GL4. Older ones could take GL5. The properties are very different, GL4 is quite "slippery".
Syncromesh is light as motor oil where GL4 and 5 are thick as snot.
 

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Discussion Starter #11
A full power 1-2 shift was impossible before.
It's easier now, so yeah, I'm thrilled with Syncromesh.
 

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central fl. gencoupe club
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1,371 Posts
I use royal purple gear oil in my tranny,it is rated both GL4 and GL5
I didn't have any problems with my tranny,but when I reached 26,000 miles I decided to change it any way.
I changed the differential oil at the same time and now after 39,000 miles it's still going strong,no problems.
you can run it for a long time without worrying,as royal purple was designed for offroad extreme driving,like the Baja race's etc.
so no problems if you run it for a year or more before you change it again.
 

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never use only drop once!
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@Franklin Do you know what that synchromesh is rated at? I wouldn't put something in my transmission that didn't specifically state whether it was GL-4 and GL-5. Our transmissions are not compatible with GL-5 according to Hyundai. I'd also be concerned about the VI if it doesn't explicitly state it on the bottle... not to mention that VI is different at the same weight between GL4 and GL5

@Dirtyloud - GL4 is an API standard and it is pretty specific a GL4 oil has no pour depressants and no anti shock additives and less EP additives and DIFFERENT friction modifiers than GL5.

The other difference between GL4 and GL5 is that GL4 is non-ferrous metal safe (brass, bronze, etc.) since we have brass synchros, our trans is specced for GL4. Apparently most synthetic GL5s now have shock deactivators that keep the shock inhibiting (think Redline Shockproof) additives from corroding yellow metals...so much so that the GL4 spec is becoming obsolete... You can find good info on it at - Bob is the Oil Guy

Gear Tribology and Lubrication - Part I | Technical and White Papers | Bob Is The Oil Guy

@ flacoupe That's not possible. They're completely different. You may have a GL5 oil that says it's non ferrous metal safe, but that doesn't make it a GL4. They have completely different profiles. GL5 is differential oil. End of story. It has different friction modifiers from GL4, and more of them. It's also got typically twice the EP additives that GL4 has, and it's much more viscous at the same weight than a GL4 oil. The trans is specced for GL4, you should put GL4 in it. GL5 only in the differential.
 

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Discussion Starter #14
The only issue is: the transmission shifts like crap with GL4.
It's not what's called for but it makes a needed improvement.
The question is whether the Syncromesh will protect from long term wear.
Gl4 reduces metal to metal contact. In a transmission that already has issues is not helping.
 

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never use only drop once!
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Covering up the symptoms isn't the same as fixing the problem. I understand wanting smoother shifts, but when a specific heat dissipation rating, viscosity index, and modifier % is specified from the manufacturer...it usually is done so for a reason. No arguments here that the trans shifts like ****. I'm actually putting redline MT-85 in my trans this afternoon and probably flushing the redline 75-90 I put in the diff 3 weeks ago in case there was any **** left in there. I have to pull the subframe, so I might as well if I have enough left over.

I'll let you know what I think about the MT85. This is my first trans fluid change since the trans got replaced at 27k. New trans...still shifts like ****. IMO the shifting issues are DMF related and not so much the trans. Maybe the trans isn't great, but the DMF just exacerbates the problem and is a bigger piece of ****.
 

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Discussion Starter #16
What does dimethylformamide have to do with shifting? :-O
If there was a fix for the transmission I'm sure there's a bunch of us that would do it.
There's no new internal parts and the '13 is the same parts as well. I checked the part numbers.

IMO, that leaves us patching what Hyundai gave us.
 

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never use only drop once!
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What does dimethylformamide have to do with shifting? :-O
If there was a fix for the transmission I'm sure there's a bunch of us that would do it.
There's no new internal parts and the '13 is the same parts as well. I checked the part numbers.

IMO, that leaves us patching what Hyundai gave us.
Dual Mass Flywheel...

The fix is the flywheel/clutch assembly. If you're on a 3.8 you can change the flywheel to a single mass no problem. The 2.0T should be internally balanced before switching to a SMF.
 

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central fl. gencoupe club
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1,371 Posts
well bked the royal purple states right on the bottle it is rated GL-4 and GL-5
i gueass because they make such a superior product they can rate it as such
i used the 75w/90, and i used it in both my tranny and diff.
next time you go to the auto parts store pick up a bottle and read the label,you might learn something.
 

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Jedi Master
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do NOT USE ROYAL PURPLE!!!!!

(why don't people read!!!)

I only say this to save you a trip to the dealership and 3 weeks of arguing to get a new trans. Royal Purple will destroy your transmission.

Do REAL research on there product (not whats on the bottle) there gear oil is 100% intened, completely and only for mechanical commponant drag reduction. THe oil only serves as a lubricate it has NO shook resistant additives. Royal Purple make there gear oil for the mechanical commponents to not have lo resistance, not to protect the components.
 
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