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Mopar torque converter differences

Discussion in 'The Hokey Ass Message Board' started by 19vegas56, Nov 19, 2011.

  1. 19vegas56
    Joined: Apr 4, 2004
    Posts: 30


    I have a '48 Plymouth that came w/ a 360 in it. The 360 has a nasty rap so I pulled it & have a 318 to go in, using the tranny from the the 360. Today when I went to change the torque converter I noticed that the slots in the hub of the 318 t.c. are about a 5/32" wider than the slots in the 360 t.c. I don't like the slop that this would cause. Why the difference? Should I just knock the weights off the 360 t.c. & use it w/ the 318?
    Last edited: Nov 20, 2011
  2. RodStRace
    Joined: Dec 7, 2007
    Posts: 2,777


    Pump drive slots? They should match the trans. Was the 318 hooked to a 904?
    I think the input is a different diameter too, but not sure.
    So long as you remove the weights, you should be good, but don't forget to mark the flexplate and TC so you don't do the bolt hole dance!
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 50,932


    there's a trick to it...something about the little whole in the flexplate being up, and the drain plug being down? then they line up. it's been almost 10 years since I put one in!

    But yeah, most likely it's a 904 converter you're trying to put in a 727? look at the pans on the transmissions, if one kicks out about an inch where the filler tube goes in, then it's a 727, if not then it's the 904
  4. Bonneville Avanti Dan
    Joined: Jan 21, 2011
    Posts: 243

    Bonneville Avanti Dan
    from California

    Do Not Knock Off The Weights!!
    The 360 Mopar is externally balanced. The 318 is internally balanced. If you try to use the 360 convertor on a 318 you will have one hell of a vibration. I know this first hand. Go to your local trans shop and buy a rebuilt 318 convertor. I like to use the 10" convertor as it gives me a nice 1800 to 2000 stall speed for easy street driving. The stock convertor on most 318's is a 12" or 11" and carry a 1200 to 1500 stall. By the way you have to use the 318 harmonic balancer also. The 360 is part of the external balance package.

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