Tractor fluid in a transmission

[zooguy]

The torque converter on my car is pretty loose and talking with a couple Old Timers at the racetrack and parts store some of them recommended that I actually replace all of my transmission fluid with tractor hydraulic fluid to help tighten up the torque converter anybody ever heard of doing this?

Maybe Frank Cahall could chime in?

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[Enthusiast]

Yah Ive heard of it. You can do some searching using Hy-gaard, thats the john deere brand, but apparently its pretty common. The hydraulic fluid is normally clear though, so most people mix it with a little trans fluid so you can actually see it on the stick.

I believe there are two viscosities, I think the heavier one can generally tighten up a converter.

Its what Im putting in the race car, when I put the shift kit in.

[shownomercy]

Really depends on how much you expect to gain, but it will tighten things for sure.

Go on the bullet and do some reading

[Cathead]

That's interesting. Other than a tighter converter, any pro's & con's when doing this fluid swap?

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[zooguy]

I've Been Told that it will also lower my transmission temperatures a little bit because the torque converter won't be stalling so fast in the low RPM range below the stall speed

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[Cathead]

Does it hurt the pump or seals or anything like that?

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[zooguy]

I wouldn't think so but Frank Cahall would be the expert on this subject matter

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[Cathead]

Yep. Frank knows his shit, he built mine.

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[JPosey]

I have a bracket race dragster with a powerglide. Runs 4.90-5.00 in eighth mile. In my dragster, tractor fluid made it slightly tighter on the graph but it also ran a lot warmer. did not like it and do not use it anymore. It it very popular with the ultra high horsepower turbo guys. Type f in my powerglide and Mercron Dextron 3 in my 4l60e for me.

[Cathead]

I use Dex 3 in my 4L60E, also. I recall asking Frank about any fluid recommendations and he said "Dex 3. How much you want to spend is up to you".

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