GM Synchromesh is teh ROCK!!!!

[toucci]

I just changed mine today. I used a mini beer bong consisting of $4 of 1/2" OD vinyl tubing (with a lot left) and a $1 funnell from home depot. I stuck it securely in the fill hole from the top, facing downwards with about 4 feet vertical to let gravity draw it down

The fill level is at the bottom of the fill hole so feel free to put all 3 quarts in providing you have an oil pan under the car.

The difference was immediate. The synchros grab faster (although not harder, so you still should take it easy shifting day-to-day) so I think it will prolong the life of the tranny. The shift effort is reduced by a lot, going from uncomfortable to my hands with the hard kartboy knob to comfortable. First gear still requires rev matching for smooth engagement, but rolling stops below 5 mph are a snap, unlike before.

Overall this shifted my feelings for the tranny from negative to neutral. It's no S2000 tranny, but it's a hell of a lot better than before.

 

[HarmlessJohnny5]

I'm going to confuse a few people with a choice they will face at the GM parts counter that hasn't been addressed yet.

1. Regular GM Synchromesh, GM part # 12345349
2. Friction modified GM Synchromesh, GM part #123777916
3. GM Friction Modifier added to any 75-90 gear oil

QUOTE]
WHOOHOOO, thanks a bunch for the part numbers, esp friction modifier part no. 12377916, they didn't know what it was, or that it existed until I got em that part no.
incidently, the friction modified (said to be better if you have a differential (since it requires some friction)), was only 10.01 a quart instead of 9.98 a quart for the non friction modified.

 

[mraasch]

So, which one is recommended for the MSP transmission??

 

[HarmlessJohnny5]

According to " DistantTea "
this thread, post date/time of " 06-15-2004, 09:37 AM " (I am posting this message at about 0740, so if it's off and hour or too look at the time it says I really posted this message on your machine).

"Wow.. that looked like alot of work for just changing the tranny oil... I just crawled under there and did it.

Just a warning for anyone thinking about Mobile 1... I don't care what mazda says it is THE WRONG thing for our cars, after a couple autocrosses I had severe sounds coming from my LSD and tranny. Mobile 1 thinned out so bad once it got really hot that there is no way it was protecting jack in there. Don't put that crap in there...

There are probably other oils that work just as good but you really can't go wrong with GM Synchromesh (or the cheaper but identical penzoil alternative). I'm so pro-synchromesh that I'm convincing my dealership that they are harming people's cars when they put the mobile 1 in.

Your LSD has a Synchro-like conical clutch in it, it generates heat under stress. The hotter it gets the more viscosity it needs to function properly. Unfortunately Mobile 1 thins out at higher temps for some reason. The result is a grinding noise that sounds notuntirely unlike a failing CV joint under tight slow turning.

I'm no expert though... so grain of salt."
end quote

Sounded like a good idea, and since the stuff was only 10.01 (instead of 20 bucks) I got the version with friction modifier (since I have a front end Limited Slip Differential in my MSP, instead of no LSD in an MP3).

anyone else got any more specific information, or a confirmation of this opinion for using this fluid as superior to the non friction modifier one?

oh yeah, both are synthetic, I'd bet the penzoil version is as well, though I cannot find the friction adder additative (what I would use if I had already filled up with the non friction modified version, or if I used penzoil or one of the otheres listed).


Also, Question for anyone who know, what do I need to do to compleatly remove ("flush") my old fluid and then fill with synchromesh? Do I just pour a quart of synchro through and out after it's drained, or what???

 

[Swerny]

1. Regular GM Synchromesh, GM part # 12345349
2. Friction modified GM Synchromesh, GM part #123777916

I need to know ASAP.
Which one are you guys using??????

 

[CrazyCaker]

1. Regular GM Synchromesh, GM part # 12345349
2. Friction modified GM Synchromesh, GM part #123777916

I need to know ASAP.
Which one are you guys using??????

I'd like to know as well.

Bump.

 

[Swerny]

bump?

 

[CrazyCaker]

bump?

bump again?

 

[HarmlessJohnny5]

Well, I'm now using the friction modified version of GM synchromesh. I am very happy with the results, and find that the fluid deffinantly "feels" thicker (noticed when a gear slipped a bit, the fluid was thick and slowed the gear down right quick), it dosen't seem to "thin out" like the mobil one stuff. I still cannot confirm what signifigant differance for sure that the friction modifier makes, or weather it's necessary. I reccomend you get the friction modified version if it's not too much more expensive where you are (some places want 20 bucks/quart!!).

 

[cosmo420]

well i bought the penzoil stuff and they had the friction modifier right next to it so i will do this after work tomorrow.

 

[CrazyCaker]

Thanks guys. I'm going to go with the friction modified one.

 

[davens]

Friction modifiers, either the premixed formula or the additive, are designed for LSD applications.

 

[goldstar]

[QUOTE/]oh yeah, both are synthetic, I'd bet the penzoil version is as well, though I cannot find the friction adder additative (what I would use if I had already filled up with the non friction modified version, or if I used penzoil or one of the otheres listed).

Also, Question for anyone who know, what do I need to do to compleatly remove ("flush") my old fluid and then fill with synchromesh? Do I just pour a quart of synchro through and out after it's drained, or what???[/QUOTE]

Synchromesh is a mineral-based oil, not a synthetic. It is made from paraffinic base stocks. For more information, go to:
www.stealth316.com/2-pennzoil-synchromesh.htm
www.pennzoil.com

If you want to use a true synthetic oil, try Red Line MT-90.

You don't need to flush your transmission when changing oil. Just make sure that you drain when the oil is hot as you get a more complete drain that way.

 

[Swerny]

The Friction modified stuff is semi-synthetic.
I picked up 3 bottles last night.

 

[gregy]

I use this in my Honda and it makes the shifting a little less notchy, going into 1st and the 1st to 2nd shift is smoother. I cant comment on which one to get but the GM product is made by Penzoil but its what is preferred over the standard yellow penzoil stuff. Specifically the GM product with the Friction Modifiers. Thats all I have ever used and thats what most of the Honda drivers use.

Friction modified GM Synchromesh, GM part #123777916

It is not signifigantly more than the non Friction Modified so I would suggest going with this product.

Someone mentioned the LSD having fluid, has anyone changed that out? Someone also mentioned that the stock factory fluid is Mobil 1? Is that true? I used Mobil 1 in my honda (says in the manual that 5w30 oil can be used) but it shifted horribly.

 

[sr240z]

You Sure Your Honda Doesn't Use 75w130? The Lsd Fluid Is Apart Of The Tranny In These Cars As Its All One Unit, So When You Change Your Trans Fluid You Are Changing Your Diff Fluid.

 

[TurfBurn]

for reference... use synchromesh if you want to detonate your transmission if you make more than 250 whp. Pretty much every trans that has popped so far during normal driving had synchromesh in it... I still stand by Redline Shockproof lightweight and heavyweight.

Later!

Steve

 

[gregy]

I used the GM synchromesh with FM based on reccomendations from other owners of the same car. The car specifies Honda MTF, I dont know the grade. All I can say is that it definately improved the smoothness of shifting. If you go to any honda forum, you will see tons of posts about it.

 

[ForceFed]

I used the GM synchromesh with FM based on reccomendations from other owners of the same car. The car specifies Honda MTF, I dont know the grade. All I can say is that it definately improved the smoothness of shifting. If you go to any honda forum, you will see tons of posts about it.

Wrong car pal....Your honda experience does not apply in this situation...Not all cars are created the same. What works for one may not work for another. Do a search and read some posts(RTM)

 

[sr240z]

Redline Shockproof Is Awesome... I Used Redline Shockproof Heavy In My 240z Lsd Diff And Light In My Sr20 Trans And It Was Amazing The Difference Is Feel And Temperatures Of The Fluids During Use.