primary fluid Q

Discussion in 'Transmission' started by noeld, Mar 17, 2013.

  1. noeld

    noeld Member

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    i was planing on running ATF in my 89 primary,& was told to run type F but not dexron III but when i looked at the bottles marked ATF they said that they were made for dexron-mercon cars so can i use this stuff or just type F ???
     
  2. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    I have seen this question several times and my thought has always been that there is more going on the the primary case than just clutch friction. The primary chain and drive gears have to enter into the equasion. I for one will continue to run the lubricants that might be a trade off but have given me good service.
     
  3. BUBBIE

    BUBBIE Well-Known Member

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    I have always shied away from ATF fluid in the primary of my Big Twins.

    May work for some, but I like a little more lubrication... (my thinking)

    I do use MTL buy Redline, I also use Harley Formula+ in my sportster.

    Some replacement Clutch's and after-market parts call out for OR suggest to use ATF.

    signed....BUBBIE
     
  4. Ga98Dyna

    Ga98Dyna Member

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    Had good luck with Formula+ in the Primary for a lot of years, see no reason to change.
     
  5. 90FXRS

    90FXRS Junior Member Contributor

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    Are you running a stock clutch or an aftermarket? I have a Rivera Primo Pro Clutch in the Fatboy. Their instructions specify Dexron III. But as stated earlier, there are other factors to be put into the equation. I've known people with the same clutch that are running Formula+ with no problems. It's a trade-off in friction modifiers, lubrication and cooling. The primary fluid also dissipates the heat from the stator. If you're running the bike on the strip or riding it like you stole it........TYPE F is it.
     
  6. noeld

    noeld Member

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    i think i was told that it was a barnnet clutch
     
  7. 90FXRS

    90FXRS Junior Member Contributor

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    Straight from Barnett:


    In regards to the primary oil, we do not recommend using the HD Formula Plus (the regular old HD primary oil is fine). Any of the aftermarket brands such as Motul, Drag Specialties, Redline, etc. are all fine to use. ATF (Type F) is also ok- B&M Trick Shift has been used for many years with good results as well. If you go with Mobil 1, just make sure it is their oil designed for use in the HD primary (not automotive). The main thing is to just keep good light weight, clean oil in it so it can do it's job to help cool the plates.
     
  8. noeld

    noeld Member

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    thx for reply
     
  9. Slo-Ryd

    Slo-Ryd Junior Member Contributor

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    I've run the B&M Trick Shift (Blue) in the Softie for years with no problems at all. JMO