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Old 12-26-2009, 04:21 PM   #41
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The fluid you installed was Skydrol. Its an ester based fluid and will eat almost anything......including seals not meant to be used with that type fluid. OOOOps

Mec
Yeah, skydrol is nasty... not good with Viton and just ok with NBR seals. EPDM typically...
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Old 12-26-2009, 05:16 PM   #42
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ok pan is dropped...about to go buy fluid. So how come type f instead of dex 3?
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Old 12-26-2009, 07:53 PM   #43
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It's really a personal preference and you'll get a hundred different thoughts on it, but Type F transfluid has no friction modifiers where as Dex fluids do have friction modifiers to aid in a smoother shift. Most racers want a firm solid shift and type F delivers in that department. It's also common to mix Type F and Dex fluids for a happy medium. There is no right or wrong here really, but drivetrain slip reduction keeps me happy

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Old 12-27-2009, 12:08 AM   #44
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It's really a personal preference and you'll get a hundred different thoughts on it, but Type F transfluid has no friction modifiers where as Dex fluids do have friction modifiers to aid in a smoother shift. Most racers want a firm solid shift and type F delivers in that department. It's also common to mix Type F and Dex fluids for a happy medium. There is no right or wrong here really, but drivetrain slip reduction keeps me happy

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Well this new transmission shifts way hard enough lol. I went with Gastrol Dex. So far is has helped. But that was only about 5 quarts worth. I think it took 12 qtrs. What would happen it it had to much fluid? Would it build up to much pressure...or just puke it out of the tube?
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Old 12-27-2009, 05:55 AM   #45
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I'm not sure what kind of functional issues it might cause from being over filled, but it'll definitely expand when hot and puke out the vent tube. That will not only make a mess, but it could get under the back tires and wreak havoc.
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Old 12-27-2009, 06:35 AM   #46
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i know some of the guys around here use tractor fluid, i thought the reason was it was less flamable, in case of an explosion, but maybe im wrong
when i built my old switch/pitch turbo 400, the guy that built the converter
gave me a couple diff brands of tractor fluid to use, but i never did
years ago, Ford used the type F fluid for some v/b control, where sup. GM used diff mach in the v/b, and lighter fluid, but years ago most guys used F fluid in the trans-at one time there was a mismatch of fluids/seals not being compatable
i just use dex in my 4L80E, it has no problem getting a shift, lol
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Old 12-27-2009, 10:58 PM   #47
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Depending on your combination, you many or may not notice a stall speed difference with tractor fluid. You will however, have a noticeable loss in transmission operating temperature with tractor fluid. There is really no down side to tractor fluid, as long as your transmission is set up to use it.
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Old 12-28-2009, 07:12 AM   #48
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Depending on your combination, you many or may not notice a stall speed difference with tractor fluid. You will however, have a noticeable loss in transmission operating temperature with tractor fluid. There is really no down side to tractor fluid, as long as your transmission is set up to use it.
Yeah my transmission guy told me too, said it makes them run 30 degrees cooler....
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Old 12-28-2009, 07:42 AM   #49
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While not new to us we have bean running John Deere HYGAURD in the turbo cars as it will take the heat without foaming or breaking down much better than atf. Sythetic air compressor oil also works well to. This is common practice in turbo cars that take a lot of time to spool.

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Old 12-28-2009, 08:07 AM   #50
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While not new to us we have bean running John Deere HYGAURD in the turbo cars as it will take the heat without foaming or breaking down much better than atf. Sythetic air compressor oil also works well to. This is common practice in turbo cars that take a lot of time to spool.

Greg
Any of these turbo cars running 4L60es?
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Old 01-04-2011, 04:41 PM   #51
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I run mobil 424 tractor fluid in my 200 4r with no issues . 424 degree boiling point and perfect shifts.
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Old 01-06-2011, 09:09 PM   #52
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It works, it has to meet a minimum rating for C4 allison fluid. Depending on how hot the combo is anywhere from 200 to 450 rpm drop in stall speeds. I use it as a tool, like if I missed the converter by a touch, the fluid brings me back in so I know when that converter comes out, what needs to be done. Popular brands are john deere hy-guard (has to be hi viscosity), citgo torque fluid, cat drivetrain oil, mobil lube 424. I've been liking travelers premium tractor drivetrain oil (any tractor supply) cause you can get it anywhere and it works.

But a word of caution: dacron filter elements (4L60-E typical) hate tractor oil. Can't get it thru the filter. Like someone breathing thru a straw, and then some smart *** pinches off the straw.
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Old 01-06-2011, 09:09 PM
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