Transmission fluid

[jmantle]

Originally Posted by ss3011

I recommend Castrol TransMax (which is also marketed as Allison TransSynd) , or Redline D4 . These fluids are basically a Dextron equivalent.

One thing that I noticed is the synthetics seem to perform the same all day long, where the mineral based (non-synthetics) seem to be slower on the first run of the day.

The friction package built into Dextron oils compared to Ford type F is quite different. Dextron has a higher static coefficient of friction, then Ford type F, which basically means it holds the clutches without slipping, better then type F . If you run lower line pressures in the transmission, this could be plus !

Type F doesn't have any friction modifiers, Ford took them out of the Type A in the mid 60's to cover up some design issues with the C4. I agree with you on the synthetics, they do seem to be more consistent between hot and cold and I run and recommend to my customers to run them. I like the Transynd type fluids because they are full synthetic, meet Dexron III friction properties and are a higher viscosity than some of the newer passenger car fluids. Check out TES 295 on Allison's website, it gives a full list of approved fluids that meet the same specs as Transynd.
The attached article explains some interesting facts about tranny fluids.

http://www.aftonchemical.com/Insight...ATFspreads.pdf

Jim Mantle V/SA 6632