This statement came from a speedshop owner, Valvoline dealer, that also was a dealer for B&M.
"The Trick Shift is just Type F ATF packaged by a refiner for B&M."
That was in the early 70s, it could have changed since then.....
I always used type F in all my Pontiac hot rods. I never had any complaints, or problems using it. The viscosity of type F is higher than dexron, so it improves the hydraulic function in the transmission, firmer, more positive shifts.
On Jake's site, he used to not recommend using synthetic fluid, not sure if that is still up on his site, or not. He wasn't specific why he didn't recommend it though.
I was told that no matter who made, say dexron, it all was made to certain specs by GM, I assume type F was the same as. It had to meet the manufacturers spec to be called dexron, so that the label of the refiner wasn't any different than another refiner, same quality no mater who refined, and blended it.
From Jake's FAQs:
Quote:
What type of fluid should be used?
In most applications, regular Dexron III type fluid is fine. Dexron VI or synthetic is also fine but not necessary. In some very harsh conditions, the use of tractor transmission/hydraulic fluid can help fluid and clutch life. This fluid is clear and harder to see on the dipstick. It is equivalent to Caterpillar TO-4 fluid and is available in different viscosities. We recommend using the low viscosity if you decide to use it unless you are trying to use it to tighten up the converter stall slightly. We do not feel Type F fluid is up to modern specs but it will not harm anything to use it.
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