Join Date: Feb 2005
location: The Woodlands, TX
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Type-F and Honda automatic transmission, an opinion
There have been some entertaining threads about transmission fluids and Honda transmissions lately that I thought I would address in a separate thread.
I believe Honda understood the root cause of the V6 transmission failures several years ago- HEAT! If I remember, the design of the transmission case was causing the fluid to overheat and break down. Once the transmission fluid breaks down, the transmission will fail as the lubricating properties no longer can perform their designed task. The goal of the “jet kit” fix was to cool the area of the case that was causing the problem and stop the transmission fluid from overheating. I assume the transmissions that were being replaced had a “fix” from Honda in the case that no longer restricted the flow of fluid causing it to overheat. I could go look all this stuff up again, but if I remember correctly, that was the root cause analysis of the issue.
The reason a transmission cooler would not fix the issue was due to the design restriction in the case. IE, the fluid was cooked in the restricted area of the transmission. That’s not to say that a transmission cooler is a bad thing, they are always a good addition to an automatic transmission. That’s why almost all trucks with a factory towing package and many high performance vehicles also include an auxiliary transmission cooler.
As far as “Type-F” transmission fluid goes, if my memory serves me, that is “FOMOC” Ford Motor Company designed fluid used in production vehicles for years! Type -F fluid has been around since at least the 1960’s and was always considered a quick way to modify (Speed up) the shift characteristics of other automatic transmissions. It has always been the first upgrade that anyone who drives a high performance Chrysler automatic transmission known as the 904, 727 series or ”Torque flights “ has under taken to speed up the shift characteristics. Modified value bodies that increased the line pressure at WOT also were a modification that would speed up the shifting with the goal of getting a chirp of the tires going into second gear. Also if I remember Chrysler specified no drain intervals for torque flights under normal conditions. This goes back to the 1960’s when they first were introduced. They are still a staple of high performance racing and the most built proof automatic transmission ever built.
Now we live in a time where smooth slurred shifts of the transmission are expected by a public that has no real interest in automobiles. The engineers are most likely building around these parameters and do not have a say into doing what they may like to do. So the friction modifiers are added because most people today don’t want to feel the transmission shifting. To accomplish this task a lot of manufactures pull timing out of the motor when shifting gears. Faster clutch engagement will always prolong the clutch discs in an automatic transmission. However this increased shock may stress other internal components of the transmission.
Without “proof” it is hard to say that any Type-F transmission fluid would increase the shift characteristics of any transmission to the point of causing damage (My opinion), however they may “firm up” the shifts to where you can feel them and prolong the clutch disc life.
So do whatever you want, it’s not likely that any of these fluid are going to cause any damage to your transmission.
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