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Tranny selection?

Discussion in 'The Hokey Ass Message Board' started by RED-EYE-KUSTOMS, May 3, 2013.

  1. RED-EYE-KUSTOMS
    Joined: Oct 31, 2011
    Posts: 69

    RED-EYE-KUSTOMS
    Member
    from CA

    Hoping someone can help out an FNG:
    Looking for some ideas on transmission selection for my coupe. I ditched the 350/350 combo for a 390 Caddy and want to go with a manual transmission.
    390-
    [​IMG]
    '30 Coupe
    [​IMG]

    Tires- Radir cheaters, 29" tall x 9" wide
    Rear- 55 Chevy
    If anyone can give me an idea and what the particular transmissions come out of would be greatly appreciated!!
    Thanx
     
  2. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 8,210

    theHIGHLANDER
    Member

  3. GassersGarage
    Joined: Jul 1, 2007
    Posts: 4,728

    GassersGarage
    Member

    T-500 or T-600, both 5 speeds.
     
  4. Lakehouse51
    Joined: Sep 29, 2010
    Posts: 34

    Lakehouse51
    Member
    from Virginia

    Food for thought ,how about 3-on tree od, 1954 or back coloum.
     

  5. tylercrawford
    Joined: Jan 30, 2011
    Posts: 726

    tylercrawford
    Member
    from Buford, GA
    1. S.F.C.C.

    how many speeds are you looking for?
     
  6. RED-EYE-KUSTOMS
    Joined: Oct 31, 2011
    Posts: 69

    RED-EYE-KUSTOMS
    Member
    from CA

    Thanx for the info so far. Looking for probably 4 or 5 not sure. Will probably be mostly around town but do plan on making some trips in it when done.
     
  7. RED-EYE-KUSTOMS
    Joined: Oct 31, 2011
    Posts: 69

    RED-EYE-KUSTOMS
    Member
    from CA

    Also, the T-500 and T-600...what are these harvested from?
     
  8. Ole don
    Joined: Dec 16, 2005
    Posts: 2,915

    Ole don
    Member

    If you don't have one and have to spend money anyway, don't settle for less than a good one. Spend your money once, go with a good five speed. A T 500 should be enough for that engine, it has great ratios, and six places to choose for a shifter location. Use the correct oil in it and it will last you a lifetime.
     
  9. tylercrawford
    Joined: Jan 30, 2011
    Posts: 726

    tylercrawford
    Member
    from Buford, GA
    1. S.F.C.C.

    took me a minute to figure that one out too . . . I believe they are referring to the tremec TKO-500/600s . . .

    Didn't come in anything out of the junkyard if thats what you are looking for.

    The only modern "decent" 5 speed that you can actually find in a junkyard will be the T-5. Fords had a shifter location almost on top of the output shaft and chevys up a little further. The problem with them is the case is super weak and flexes easily once you start getting out past 300ft-lbs or so. You can break one powershifting a stock mustang, typically into 3rd. Even if you don't beat on it, I've seen them break at 350rwtq+ in cars the guys didn't drive hard at all.

    3550s (essentially the TKO case and later became the TKO 500 with a different spline input shaft) never came stock in anything, maybe the 95 Cobra R? doubt thats going to be in a junkyard.

    You *might* be able to get a T-56 from a scrap yard which is the 6 speed in the high end late model american v8s . . . camaros/corvettes/cobras/vipers.

    Your best bet is probably finding a rebuilt TKO on fleabay to hold the torque of your 390 unless you stick with the 60s 4 speeds.
     
  10. With a 55 Chevy rearend which isn't particularly strong, I would not think you need a transmission that was too beefy. How about just a standard Saginaw 4 speed? They were put in a lot of GM cars over the years and if you don't race it, it should hold up fine.
     
  11. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 8,210

    theHIGHLANDER
    Member

    There's also that gig where you take a Saginaw 4spd, a Saginaw 3spd with O/D, mix the parts up and end up with a 4spd and "mechanical" O/D. I have that planned for one of mine. Saginaws are cast iron 3 n 4spds that came in millions of GM cars. More than stout enough for a 390 Cad. I've had several 390s under my right foot and it won't hurt it in a light car like that.
     
  12. Mr48chev
    Joined: Dec 28, 2007
    Posts: 29,056

    Mr48chev
    ALLIANCE MEMBER

    I'd have to go along with what theHighlander said on both the Wilcap adapter and Saginaw trans of choice. With a good shifter you would have a pretty much trouble free setup unless you just hammered the hell out of it.

    I'm thinking that a T-56 setup would take extra work/pieces along with the the fairly spendy in comparison asking price. Sure would be fun to row that coupe though that many gears though.
     
  13. RED-EYE-KUSTOMS
    Joined: Oct 31, 2011
    Posts: 69

    RED-EYE-KUSTOMS
    Member
    from CA

    So what's the word on these Saginaws? What vehicles did these come out of and they are a manual 4 speed? I remember seeing one for sale recently just don't remember where. I do plan on putting my foot in it every now and then but won't be an every day thing. Appreciate all the info! I'll have start researching a little more as well.
     
  14. Buzznut
    Joined: May 9, 2008
    Posts: 2,349

    Buzznut
    Member

    Can't you mount a Muncie M20, M21 or M22 behind it?
     
  15. RED-EYE-KUSTOMS
    Joined: Oct 31, 2011
    Posts: 69

    RED-EYE-KUSTOMS
    Member
    from CA

    Not really sure what the difference is between the Saginaw and the Muncie. I'll have to do a little reading.
     

  16. 3550's came in late model Mustangs = '01 Cobras and later '05 - '09 V8's. They're tough but shift like a fn truck.
     
  17. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Highlander, tell us more. I am looking for a trans with an od, not real enthusiastic about the big spread in the 2.95 first gear T-5s, would like something closer ratio in the first 4. I will be running a mid-four final drive with a buzzy 300" overhead , the T-5 ratio spread is gonna suck The saginaw would probably survive with a typical period-correct 7.50x15 contact patch.
     
  18. Jay Tyrrell
    Joined: Dec 9, 2007
    Posts: 1,631

    Jay Tyrrell
    Member

    TREMEC!
    Check them out!
    Jay
     
  19. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    I did, still WAAAAY too big a spread. I am looking for something more like a close ratio t-10/muncie type 2.20/1.60ish spread. the 2.54 low saginaw is at least in the ballpark...
     
  20. 66tintop
    Joined: Nov 7, 2012
    Posts: 450

    66tintop
    Member
    from Canada

    go with a mid 70's t10 borgwarner 4 speed , reasonable price and still a lot of them around, my .02 cents :)
     
  21. Buzznut
    Joined: May 9, 2008
    Posts: 2,349

    Buzznut
    Member

    There's no comparison between a Muncie and a Saginaw...the Muncie is sturdier without question.
     
  22. DaddyO's..Deuce
    Joined: Jul 31, 2011
    Posts: 782

    DaddyO's..Deuce
    Member
    from Missery

    What's the comparo between a T-10 and a muncie? Is the muncie THAT much stronger?
     
  23. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Well, we are wandering way off the theme here, but a Super t-10 is stronger than a muncie, and a muncie is stronger than a t-10.
     
  24. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 8,210

    theHIGHLANDER
    Member

    falcongeorge, the 4spd O/D gig is listed here and on some early Chev PU sites:

    http://www.jalopyjournal.com/forum/showthread.php?t=647821


    http://www.chevytrucks.org/tech/overdrive.htm

    I had 1st heard of this on stovebolt.com or 348-409.com and think it's a great idea when you want to remain faithful to a build. It "seems" easy enough. There's the old pitfalls too like making sure your parking brake works or that the O/D unit is disengaged when parking on a grade. Some, being planetary driven, will free wheel backwards if engaged, even in gear.
     
  25. HotRodAV8
    Joined: Oct 7, 2002
    Posts: 88

    HotRodAV8
    Member
    from Seattle Wa

    most 390 cad do not have provision for a pilot bushing. you have to machine the crank or go with an adapter. i got a bendtsen's with tko-600 came with every thing you need to mount the stick shift of your choice.
     
  26. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Thanks. This is interesting, might work better for my deal than the T-5.
     

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