Well, I have it in the S2000 tranny.

The previous Honda fluid was placed just before the May 25 Pahrump track event. After I had changed the oil previously, it seemed the car was difficult to get into 1st many times, and notchiness seemed possibly worse. Grinding was a common occurance at the track, but the 1st gear 'lock out' seemed lnot to be a problem after that.

GM Synchromesh Transmission Fluid has minimal odor compared to the Honda fluid. The Honda brand also smells like gear oil (sulfur like?) while the Synchromesh does not. Synchromesh is amber colored and seemed slightly thicker than Honda's, though flows freely.

At this change, the Spoon magnetic trans plug had several splinters of metal, more than at any previous change.

With the new fluid, the shifter throws seems to exhibit slightly more feel in the throws when cold, as in a knife going through firmer butter. The actual notchy part of the shift throws were much less notchy. When warm, the throws were lighter with even less notchiness; actually smoother than I ever recall experiencing with RedLine or Honda brands.

This is with just a day of driving. The impressions might change as the fluid wears.

So far, I like it and look forward to hearing from the others who plan to try GM's product.

 

So the Synchromesh is THICKER than Honda MTF? I haven't compared them side by side, but when the Synchromesh that I have looks like the thinnest oil I've ever seen. It seems really watery if I shake the bottle or wet my fingers with it.

I will change my tranny fluid tomorrow, and I'll report back too.

 

A caution.. GM sells more than one 'synchromesh' transmission fluid. It is part number 12345349 that is widely acclaimed. I hope this works well.. I have suspected that the properties are similar to RL MT-90 and the performance would be what Prolene has found. It has a very high VI so it should have limited change with temperature but I am curious to see if it is acceptable when it is cold... may be too stiff under 60F.

 

I want to thank whomever it was that first brought this product to the board's attention. The car is shifting tremendously well.

I will check as to which of the Synchromesh fluids I have.

 

Marcucci brought it up in "Notchy" Shifting - Will change tranny fluid help?(https://www.s2ki.com/forums/showthread.php?...52&goto=newpost)

 

Thanks!

The fluid I obtained is the 'correct' one: 12345349. If it does things for other transmission that it has done for mine, it is no wonder it is 'widely acclaimed'!

 

Prolene, did you pick this up at a dealer or somewhere else? Mind sharing with us a pic of the bottle?

Thanks!

 

I didn't get to change mine yesterday, since I spent the day buffing out the scratches that my little brother put on my wife's Tahoe. You've got me excited about it though. I will do it as soon as I get back home tonight.

 

[QUOTE]Originally posted by marcucci
[B]Prolene, did you pick this up at a dealer or somewhere else? Mind sharing with us a pic of the bottle?

 

Have you driven it to the point that you would have normally gotten a grind? Is it hot where you are? I was in L.A. and San Diego over the weekend, and it was really cool compared to Texas. I got a 2nd gear grind twice yesterday when I picked up and dropped off my brother, who lives 20 miles away. It was pretty hot (90s), and I was driving hard both ways.