Type F transmission Fluid?

B

Booyah the monkey

New member
I have a 79 International Scout 2, 345, 727. I am doing a rebuild on my transmission and after reading a book on the 727 by carl munroe it mentions that type f transmission oil is a good oil for a racing automatic and dexron is ok for a stock rebuild. What I want to know is would type f help in a stock rebuild. The benefits mentioned are more additives and reduced slippage over dexron. Can anybody help me out here?
 
Dexron atf should work great in your 727. The key points in a/t longevity are: keep the fluid clean/fresh, prevent the fluid from overheating, keep the trans adjusted properly, install a good shift kit.

And don't 'abuse' the trans...
 
Dex/merc is the most modern and closest incarnation to dexron iii and what I would recommend for a stock or even shift kit modified 727, as it tends to be a bit easier to find than dexron iii. Dexron vi is supposed to be backwards compatible with all earlier versions, but I have heard that it is a bit more slippery. You can find dex/merc on just about any shelf anywhere. If you were building a full race trans with all the bulletproof shizz inside, then I would say go ahead with the type f as part of that purpose built package. Otherwise...nah.
 
Nope. I could, but I won't. This is now part of the knowledge base. Might help someone else with the same question later on.
 
Whoever told you that type f fluid has more additives doesn't know the chemistry of the fluid. So, with that being said, type f fluid has fewer additives, including a pronounced "o" ppm of zinc, which is the main additive for wear control. Type f was only used by Ford for a very short time and was discontinued around 1970, it was used in transmissions with paper-faced clutches, which did not tolerate friction modifiers...in fact if you had one of those trannys with the original paper faced clutches it would slip immediately if you introduced a dexron-type fluid.

Some race teams use type f because of the faster shift as compared to dexron or mercon fluids, but the best fluid to use is swepco 714-20, which is available from IHPA by the gallon. It has more additives, yet you get a more positive shift at the same time. It also promotes better wear control, and cooler operation. It is also used in dd's as well as many different classes of racing, including baja-type off road cars.
 
whoever told you that type f fluid has more additives doesn't know the chemistry of the fluid.
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I have the same book, and unfortunately it's there just like he says. This has caused me to some research dick, and I found what you already know:gringrin:
 
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