Originally posted by rkneeshaw3.0:
Don't use friction modifier for the love of god wtf good is that supposed to do in your MTX? Its for rear end differentials!



There was a huge thread about a year ago about problems encountered with RedLine MTL. In that thread, different fluids were discussed ad-nausium. In that thread, someone posted a copy a page from his Ford shop manual (95 or 96 IIRC) showing that the factory recommendation was to add about 2 oz of Ford Friction Modifier to the ATF used to refill the MTX-75.

That aside, yes, friction modifier, the wrong kind in particular, used in too heavy of a concentration may not be good. BUT, adding friction modifier to most any manual trans brew has been a know cure for sticky synchros for decades.

Friction modifier is one of the items used to blend a good manual trans fluid. Even ATF has some friction modifier to start with. The Chrysler spec ATF+3 and ATF+4 has a higher level of ATF to start with than does Mercon or Dexron III and works very well in the MYX75 with no additional friction modifier.

While I will agree that you are better off most of the time allowing the oil chemistist (tribologist) to do the blending that cooking up your own brew, experience of many of us here at CEG has shown that Mobil 1 ATF (which is Mercon rated), Mercon, and even Ford Honey benefit from a mild dose of friction modifier.

What do I have in my car? Ford Honey with 2 oz of friction modifier. What's going into it on the next change? Probably AFT+4 without any additional friction modifier.

Do you know the function of friction modifier in the diff? It is only needed on clutch style limited slip systems. The friction modifier makes the oil more slippery so that the clutches don't grab when turning. If you have even driven an LSD car with the wrong fluid in it, you sould know what I'm talking about.

It is the same property of improving the slipperyness that often benefits synchros on a manual trans.

Jim Johnson 98 SVT 03 Escape Limited