Type F Fluid in Chevy Transmissions?????? - Team Camaro Tech
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Transmission & Driveline Transmissions and Differentials

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  #1  
Old May 25th, 07, 01:29 PM
bravewink bravewink is offline
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Default Type F Fluid in Chevy Transmissions??????

A LONG time drag racing friend of mine (Ford Guy) suggested I use Type F fluid in my Turbo 400.

His theory is that the clutch material in the Fords are meant to slip somewhat and Type F does not have additives since the clutch material slips.

GM clutch material does not slip, so the fluid has additives so the clutches will slip somewhat.

By using Type F non-slip fluid with the non-slip clutches, you have NO SLIPPING.

I did use Type F in my last tranny, it lasted for 3 1/2 years as opposed to only 2 years for the previous two trannies with the Dextron.

I just wondered if any other racers or tranny guys have had any experience with this. Looking for any and all opinions since I'm getting another tranny rebuilt.
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  #2  
Old May 25th, 07, 01:32 PM
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Default Re: Type F Fluid in Chevy Transmissions??????

Only in drag trannies that I know of...Street car shouldnt have a 'drag' tranny.
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  #3  
Old May 25th, 07, 02:40 PM
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Default Re: Type F Fluid in Chevy Transmissions??????

As Harley suggests, and I suggest also, if trans is born with DEXRON, keep it Dexron.

If new clutches and manf of the clutches gives a choice of either, I'd go with Type F. ONLY if NO Dexron has touched the clutches.

Now, a neighbor of mine did just the opposite, drained Type F and puored in Dexron. His Ford went no where. He drained Dexron and added Type F, worked just fine.
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Old May 25th, 07, 03:15 PM
onovakind67 onovakind67 is offline
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Default Re: Type F Fluid in Chevy Transmissions??????

I've used type F in all my GM trannys for years with no ill results.
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Old May 25th, 07, 03:16 PM
68RS-SS 68RS-SS is offline
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Default Re: Type F Fluid in Chevy Transmissions??????

FYI: I put Redline synthetic in a 700R4 thinking it would be an improvement and it slipped like crazy. Used reg. GM type prior and was fine.
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  #6  
Old May 25th, 07, 04:34 PM
South Side Goons & Hitmen South Side Goons & Hitmen is offline
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Default Re: Type F Fluid in Chevy Transmissions??????

I agree with Everett. If your trans has Dextron II keep that fluid in there. If it it is currently being rebuilt with new clutches, bands, etc then it's ok to use Type F.

Most people I know have found that draining & filling the trans with Type F especially in a daily driver that sees several thousand miles per year results in the same thing as switching to synthetic oil in my 1999 Ford Explorer. You can say kaboom to both your engine & tranny after doing that.

The SSG&H Bottom Line: Unless it's brand new with zero miles or it is currently being rebuilt, keep what is in it!!
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  #7  
Old May 25th, 07, 05:40 PM
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Default Re: Type F Fluid in Chevy Transmissions??????

I ran type F in my TH400 for 14 years without any problems. When I went to type F the trans was just built and did not have any Dexron in it. Now I use Redline synthetic.
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Old May 25th, 07, 05:47 PM
JimM JimM is offline
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Default Re: Type F Fluid in Chevy Transmissions??????

Back in the old days that was a common "trick." They sold B&M slick shift fluid back then, expensive stuff. Me and my buddies used type F, the tranmissions shifted great.
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  #9  
Old May 25th, 07, 07:18 PM
bravewink bravewink is offline
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Default Re: Type F Fluid in Chevy Transmissions??????

The tranny will be rebuilt and will not touch any Dextron.

I knew about the Trick Shift "secret".

I was just checking to see if anyone else had any experience with using the Type F fluid. It seemed to shift harde than the Dextron and seemed to hold up better in my last transmission.

Thanks for the replies.
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  #10  
Old May 25th, 07, 07:45 PM
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Default Re: Type F Fluid in Chevy Transmissions??????

I have no problem with Type F in a new trans. Its just if it was Dexron in service, then change to Type F, trans won't work.

New clutches, Type F, no problem. Mystery solved, trans runs great. Like I said, if Dexron touched clutches, then Dexron it is for its service life.
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  #11  
Old May 27th, 07, 05:17 PM
Oldani Motorsports Oldani Motorsports is offline
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Default Re: Type F Fluid in Chevy Transmissions??????

I suggest Dex/Merc fluid in all the Glides and 3-speeds I build. The "must use Type F" deal is bunk. It has less lubricity than the Dex/Merc fluids do, and don't believe those who try to tell you a trans will slip with anything other than Type F. I've run over 1500 hp through a Glide using ordinary Dex/Merc fluid. If heat becomes an issue use Mobil 1 or Amsoil.
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  #12  
Old May 27th, 07, 05:56 PM
jakeshoe jakeshoe is offline
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Default Re: Type F Fluid in Chevy Transmissions??????

Quote:
Originally Posted by Oldani Motorsports View Post
I suggest Dex/Merc fluid in all the Glides and 3-speeds I build. The "must use Type F" deal is bunk. It has less lubricity than the Dex/Merc fluids do, and don't believe those who try to tell you a trans will slip with anything other than Type F. I've run over 1500 hp through a Glide using ordinary Dex/Merc fluid. If heat becomes an issue use Mobil 1 or Amsoil.
Steve is 100% correct (as usual).

Type F is an inferior fluid. Do the research and look at the specs for Type F vs. Dexron. Even Ford doesn't use Type F, that should be reason enough to look at why.
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Old May 27th, 07, 06:58 PM
speedfreek speedfreek is offline
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Default Re: Type F Fluid in Chevy Transmissions??????

I have used dex then changed to F and had NO problems and drove for years.
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  #14  
Old May 27th, 07, 10:30 PM
jakeshoe jakeshoe is offline
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Default Re: Type F Fluid in Chevy Transmissions??????

The fluids will mix fine, they are required to by federal law. Using one or the other isn't going to cause an immediate failure. Mixing them isn't going to cause a failure, and changing the type of fluid you are using isn't going to cause a failure.
Each fluid was designed with a specific purpose. Type F was designed for transmissions that used a bronze friction element. These transmissions haven't been in use for years. So Type F is a dying breed as far as ATF is concerned and there isn't any need to use it. It has lower thermal resistance than Dexron and is simply a lower quality fluid.
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