JohnnyJuan

I've decided that I'm gonna lean more towards GM synchromesh from what people are saying. Is there just one kind for manual transmissions?

Stephonovich

No, there's multiple kinds. You want the kind that says "Friction Modified" on it. GM P\N 12377916, AC Delco P\N 88900399. They're the same thing, just re-labeled.

JohnnyJuan

They used that part number but it doesn't come up for what I am looking for they said. They gave me a number 12345349

Stephonovich

Googling looks like that's the same stuff. The dealer I went to said they change part numbers a lot on fluids. I don't remember the number I used with them; they gave me the 889... one.

Saki GT

I've found the opposite - I've used GM SFM, Amsoil, Honda, and GM fluid works the best, although after a year I change them out.

I think each car is a little different - try the different fluids and find the one your S likes best.

cdelena

I've had the same experience and have gone back to redline.

Jdrum1

For me, GM has been the best. Amsoil felt good at first, but went downhill fast (around 1k miles).

speakeasy2009

i just bought the GM Syncromesh Fortified here on Amazon -

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1


Will let you know how it feels over the MTFII. Right now i have the typical AP1 notchyness going from 1->2, 2->3 and a fresh change of the Honda MTF hasnt helped....im hoping the GM fluid helps..

The GM part number i used was 88900399.

dedonderosa

gm part number 12377916 was actually discontinued, you could always have the dealer to a locate and see if any other dealers have any stock of it lying around.

the 88900399 is the acdelco friction modified fluid, but for some reason it has a totally different smell compared to the 12377916, which makes me think it is slightly different

Timmay208

im using penzoil syncomesh in mine, so far so good