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Type F trans fluid

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by xnoahx, Sep 23, 2001.

  1. xnoahx

    xnoahx 1/2 ton status

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    I hard that using Type F trans fluid is better than dexron III because the dexron is designed to slip for a smoother shift While the Type F helps make a firmer shift. Is this true?

    My 73 K5 <a target="_blank" href=http://www.geocities.com/xk5blazerx/73k5.htm>http://www.geocities.com/xk5blazerx/73k5.htm</a> 350/TH350/NP203, Q-jet, Edelbrock intake, Vortec heads, 4" lift, and 36" TSL's
     
  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Type F fluid is Ford stuff. They used this stuff on the older vehicles.

    Now adays, on the newer Fords, they use the Dexron fluids.

    Does that tell you something? [​IMG]

    <font color=red>I'm a "black top mudder"!!!</font color=red>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  3. xnoahx

    xnoahx 1/2 ton status

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    That doesnt really tell me anything, it would make sense that they use the dexron now because its made to slip and provide a smoother shift. Anyone else?

    My 73 K5 <a target="_blank" href=http://www.geocities.com/xk5blazerx/73k5.htm>http://www.geocities.com/xk5blazerx/73k5.htm</a> 350/TH350/NP203, Q-jet, Edelbrock intake, Vortec heads, 4" lift, and 36" TSL's
     
  4. mudddog91

    mudddog91 1/2 ton status

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    Ive got a transmision overhaul and performance build up book that I bought at barnes and noble and Ive been running type F in my 1991 z-71 for about 3 years now and it makes a big difference.The way the book explains it is that the dexron IS designed to slip a little for a more comfortabl ride , plus dexron has got more anti corrosive and anti viscosity breakdown additives in it .Basically the book states that typeF and the expensive fluids like trick shift and such are the same stuff!Like I said Ive been running this for 3 years now and have been more than happy with the shift feel!!!!!1
     
  5. Hossbaby50

    Hossbaby50 3/4 ton status

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    Will the Type F fluid run hotter than the Dexron 3? Firmer shifts would be nice, but if it runs hotter it wouldn't be worth it to me because I run a 700R-4.
     
  6. Thunder

    Thunder 3/4 ton status

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    I have heard the same thing. I know some people use type F fluid in auto transmissions built for racing.Type F is designed as a high friction fluid and should only be used in transmissions designed for this type of fluid. It probabally would provide firmer shifts.
    However I wouldn't put fluid designed for a ford in my GM trans.It is highly recomended by all lubricant manufactures not to do so.. They are designed to run on a fluid with the friction charestics that dexron has. I believe using type F will cause wear and durability problems.
    Dexron is good fluid. Even ford has been using it sence 1981. There must be a good reason no one uses type F fluid any more.
    If you want to firm up your shifts by changing fluid try TCI or B&amp;M trick shift trans fluid.

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze>http://coloradok5.com/gallery/Thunders-Blaze</a>
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  7. flcpl4fn

    flcpl4fn 1/2 ton status

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    i was told years ago when i had my 1975 blazer that the f-type fluid would hold up to hotter temps than the dexron III. and i didn't have a problem running it in my older truck

    '85 Jimmy in Jax, Fl
     
  8. xnoahx

    xnoahx 1/2 ton status

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    About it raising the trans temp, slippage causes heat and so if type F reduces slippage then it should run cooler.

    My 73 K5 <a target="_blank" href=http://www.geocities.com/xk5blazerx/73k5.htm>http://www.geocities.com/xk5blazerx/73k5.htm</a> 350/TH350/NP203, Q-jet, Edelbrock intake, Vortec heads, 4" lift, and 36" TSL's
     
  9. Twiz

    Twiz 1/2 ton status

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    Thats a old school drag racing trick. These guys have been running Type F trans fluid in Glides/T350/T400 for years, it firms up the shift and that would also help the trans run cooler. I think it's compatible with the older G.M. auto transmission seals and valve bodys, but I'm not sure. I haven't heard anyone that runns Type F fluid in thire G.M. trannys say anything bad about it....BUT....

    I wouldn't run it in a 4 wheel drive on the street that HAS a shift kit installed allready. The combination of the shift kit AND Type F fluid, -might- be too aggresive, and the rest of the drive train would take a beating. (just my opinion)

    An average auto trans holds somewhere around 8-10 qts of ATF. A trans service only changes out about 4 qts.

    You can't go the other way around and run Dex.III in a old Ford C-4 or C-6. I've heard they slip to much and would self destruct with the Dex fluid.

    Dextron III can be run in ALL G.M. auto trannys. It is the same "100,000 mile" trany fluid used today. It's good stuff and seams to work as advertixzed from what I've seen.

    <font color=green>1012</font color=green>

    <font color=blue>Twiztid</font color=blue>
     
  10. Jason73K5

    Jason73K5 1/2 ton status

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    B&amp;M Trick Shift fluid is type F (just put a bottle in my Cougar), so if you can use it, then using any type F shouldn't hurt.

    73K-5: TBI350/TH-400/NP-203/14FF/D44
    Topless, doorless and no tailgate!
    Fresno, CA
     
  11. mudddog91

    mudddog91 1/2 ton status

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    There is a good reason people dont use type F fluid anymore,its because they design trannys to slip enough to provide driver comfort and because of its anticorrosive properties.Type F doesnt have these properties but it does have the firmer shift we are all looking for. B&amp;M's trick shift IS type F .TRY it and you wont go back to DEXron.I DIDNT notice an appreciable difference in temp after the swap so I cant confirm or deny..........
     
  12. Thunder

    Thunder 3/4 ton status

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    Trick shift fluid is similar to type F. But it's additives allow it meet or excede all the Dexron or Mercon requirements. Type F does not meet these requirements.
    I'm not saying type F wont work in an older trans. I'v heard it works good in older TH350s. Also If your trans is rebuilt with heavy duty performance parts I dont think Type F would do any harm.
    But I would never put it in a newer stock trans like a 700r4, 4l60E, ect. They are designed for Dexron. Firming up the shifts on these tranys without modifing the clutch packs and other stuff inside usually results in damage.

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze>http://coloradok5.com/gallery/Thunders-Blaze</a>
    <font color=blue>NEVADA: Where the pavement ends, and the West begins.</font color=blue>
     
  13. wayne

    wayne 3/4 ton status

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    I have a th350 in my 73 pick up with a B&amp;M deep pan and they reccommend using type F fluid over the Dextron.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     

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