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Customs 1955 Cadillac hydra-matic what fluid??

Discussion in 'The Hokey Ass Message Board' started by The G00SE, Mar 20, 2015.

  1. The G00SE
    Joined: Nov 9, 2011
    Posts: 152

    The G00SE
    Member

    Ok folks I have a 55 Cadillac 331 hydra-matic combo im stuffing in a 56 Cadillac coupe. It's time to start filling up fluids. The fluid that came out of the tranny was clean but didn't look like dex/merc . Ive been having trouble scaring up info on what people are using. I posted on the hamb Cadillac cruiser page and one Cadillac brethren posted back that he is using b&m trick shift ( thank you). I saw one other post on the internet were a guy said dex/merc is fine to use . Can anyone confirm that? I dont know squat about trannies, thanks for any help.
     
  2. I've used Dexron in mine but have Type F in it at present... supposedly shifts better and leaks less.
     
  3. chopolds
    Joined: Oct 22, 2001
    Posts: 5,990

    chopolds
    Member
    from howell, nj
    1. Kustom Painters

    Used whatever version of Dexron that was available during the entire time I drove my 55 Olds, with hydro. Still works fine, since 1982.
     
  4. The G00SE
    Joined: Nov 9, 2011
    Posts: 152

    The G00SE
    Member

    Alright guys thanks for the help. With that type F do you notice a difference? Warbird1
     

  5. d2_willys
    Joined: Sep 8, 2007
    Posts: 4,188

    d2_willys
    Member
    from Kansas

    I use Dexron III in my hydros. (All single coupling types like you have). The type F fluid has more abrasives in it and some of the friction components might wear a little faster than with Dexron III.
     
  6. The G00SE
    Joined: Nov 9, 2011
    Posts: 152

    The G00SE
    Member

    Alright d2willys thanks for the heads up . Ill go with the dex 111. Keep it simple. Thanks again every one
     
  7. I ran type F in my 4sp. hydramatic after an overhaul. Operated perfectly.
     
  8. Nope, never noticed any difference with the Type F in my single-range clunker. I'll probably go back to Dexron when I install the rebuilt Olds dual-range in my roadster.
     
  9. pontiac
    Joined: Mar 21, 2006
    Posts: 769

    pontiac
    Member

    I run Dexron III/DexMerc in my dual range Hydra-matic... 11 years, 80k+ miles no issues.
     
  10. Fender1325
    Joined: Aug 31, 2014
    Posts: 730

    Fender1325

    I have a 1950 hydramatic (1950 cadillac 331) and I use Dexron VI. I mustve called 6 cadillac dealers to see if they could verify an article I read claiming theres a service bulletin stating all modern dexron's are compatible with all previous generation dexrons. Not surprisingly none could answer, but I got a hold of an older hyrdramatic rebuilder/specialist who told me the VI would be fine. So far everything seems just fine.

    I do believe I read the VI has a stronger shear capability designed for the tighter tolerance modern gm transmissions. I think it might be more like comparing synthetic to standard. Seemed to leak a little at first but that went away. The car has been parked for many years and is just waking back up. Good luck. I think you'll be fine with III or VI.
     
  11. Using Dexron III in my Jetaway, after a fresh rebuild.
     
    Bishop Schulz likes this.
  12. The G00SE
    Joined: Nov 9, 2011
    Posts: 152

    The G00SE
    Member

    Thanks every body
     

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