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Okay, I am looking at my old textbook from school - "Automotive Technology - A Systems Approach - 3rd Edition"
I'd like to put a few quotes in here from pages 988, and 989 discussing the differences between DEXTRON-III/Mercon and Type F (and other transmission fluids)
"The various chemicals added to ATF ensure its durability and overall performance. Zinc, phosphorus, and sulfur are commonly added to reduce friction [friction modifiers]. Detergent additives are added to ATF to help keep the transmission pars clean. Dispersants that keep contaminants suspended in the fluid so they can be trapped by the filter are also added.
Because some chemicals used in the composition of transmission fluid may adversely react with the fibers or synthetic materials used in the seals of the transmission, the compatibility can result in external and internal transmission fluid leaks due to deterioration, swelling and/or shrinking of the seals."
"To reduce ware and friction inside a transmission the most commonly used transmission fluids are mixed with friction modifiers. Fluid types A, CJ, H, Dextron, and Mercon have friction modifiers [reduce friction] added to the ATF. Transmission fluids with these additives allow for the use of lower clutch and band application pressures, which, in turn, provide for a very smooth feeling shift. Transmission fluids without a friction modifier, such as type F and G tend to have a firmer shift because higher clutch and band application pressures are required to avoid excessive slippage during gear changes.
If an ATF without friction modifiers [type F] is used in a transmission designed for friction modified fluid [Dextron III] the service life of the transmission is not normally affected. However, firmer shifting will result and the driver might not welcome this change in shifting quality. Transmission durability is effected by using friction modified fluid in a transmission designed for nonmodified fluids. This incorrect use of fluid will cause slippage, primarily when the vehicle is working under a load. Any amount of slippage can cause the clutches and bands to ware prematurely. Also, because of the high heat generated by the slippage, the fluid may overhead and lose some of it's lubrication and cooling qualities, which could cause the entire transmission to fail."
I'd like to put a few quotes in here from pages 988, and 989 discussing the differences between DEXTRON-III/Mercon and Type F (and other transmission fluids)
"The various chemicals added to ATF ensure its durability and overall performance. Zinc, phosphorus, and sulfur are commonly added to reduce friction [friction modifiers]. Detergent additives are added to ATF to help keep the transmission pars clean. Dispersants that keep contaminants suspended in the fluid so they can be trapped by the filter are also added.
Because some chemicals used in the composition of transmission fluid may adversely react with the fibers or synthetic materials used in the seals of the transmission, the compatibility can result in external and internal transmission fluid leaks due to deterioration, swelling and/or shrinking of the seals."
"To reduce ware and friction inside a transmission the most commonly used transmission fluids are mixed with friction modifiers. Fluid types A, CJ, H, Dextron, and Mercon have friction modifiers [reduce friction] added to the ATF. Transmission fluids with these additives allow for the use of lower clutch and band application pressures, which, in turn, provide for a very smooth feeling shift. Transmission fluids without a friction modifier, such as type F and G tend to have a firmer shift because higher clutch and band application pressures are required to avoid excessive slippage during gear changes.
If an ATF without friction modifiers [type F] is used in a transmission designed for friction modified fluid [Dextron III] the service life of the transmission is not normally affected. However, firmer shifting will result and the driver might not welcome this change in shifting quality. Transmission durability is effected by using friction modified fluid in a transmission designed for nonmodified fluids. This incorrect use of fluid will cause slippage, primarily when the vehicle is working under a load. Any amount of slippage can cause the clutches and bands to ware prematurely. Also, because of the high heat generated by the slippage, the fluid may overhead and lose some of it's lubrication and cooling qualities, which could cause the entire transmission to fail."