Hey there I was curious as to what transmission fluid to use as I have been reading on some stuff called GM Syncromesh. The question is there is 2 types of this stuff. One of them is just the syncromesh and the other one is syncromesh with friction modifier. So what should I put in and should it be half and half? or just one straight one and which one? I have also heard that Penzoil syncromesh is the same stuff but its cheaper and supposonally Penzoil makes this stuff for GM. So whats your guys thoughts? Should I use another brand or what? Its for a T-5 tranny...thanks

 

Good question, i've used the regular GM syncromesh a couple times on imports with big hp, no problems for me personally, but a friend of mine blew up 2 eclipse 4wd transes shortly after switching to it..... and one trans had cryogenically frozen gears which the shop said were good to 400hp

 

From what i was told the royal purple stuff was the way to go. Regular ATF fluid with regular oil changes would be fine as well.

 

Guys at the local ford Motorsports recomend anything with Syncromesh for mine. Tremec 3550. I asked cause in the Summit mags there is a note by the Tremec's that read "tranny shipped empty, Tremec specifiesDexron III ATF" ???

 

i use GM

 

I was reading about this stuff and some people swear by it!! I want to know a little more about it before I just throw this stuff in my tranny

 

I use Redline but Synchromesh was also recommended. Seems to have good properties to help eliminate notchiness in shifting.

 

I switched over to Royal purple synchromax. The T-5 shift's alot smoother as compared to the atf that was in there before. You can use the GM synchromesh.

 

T-5's take ATF

GM syncromesh is for manual transmissions....Unless they make a ATF that i havent seen

I used mobil 1 synthetic ATF fluid... Royal purple is also a good choice.

 

Here is what Penzoil say's..and they manufacture the stuff for GM:

Pennzoil® Synchromesh Fluid is a synchromesh transmission fluid designed for certain manual transaxles and manual transmissions used by General Motors or Chrysler. Pennzoil® Synchromesh Fluid is formulated with high quality paraffinic base stocks, a fluidity modifier, multifunctional performance additives, corrosion inhibitors, a foam suppressor and a shear stable viscosity index improver additive. It provides excellent oxidation stability, low temperature performance, excellent synchronizer performance and compatibility with yellow metals, such as bronze, brass and copper components found in manual transaxles and transmissions. This product will satisfactorily lubricate General Motors or Chrysler manual transaxles and transmissions from -40°C to +150°C.

Okay, that all being said....The special trait would be the emphasis on the yellow metals compatibilities, specialty lube manufacturers have been seeing a trend in issues with yellow metal when using certain parrafinic/polymer based lubrications. The results usually are "glazing" and gum like by-products. If you "glaze" a yellow metal it's through, period. Looking from the outside though, I wouldn't say it's the new wheel...It is just a little more refined as its ancestors were. Car makers are using a lot more light materials than in earlier years, making a challenge for lubrication specialists.

My advice is, with a T-5, you don't really see too much more benefit other than as previously stated, a slightly smoother shift. But long term, no real benefits. imo.