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  1. ducati-cooter

    ducati-cooter Registered Member

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    I am interested in doing a auto to manual swap, I have read the previous posts but I am wondering how well this tranny wrks for adailyb driver on hwy speeds. is 4th gear low enough to run at 70-80 mph with out reving the motor to the sky.

    thanks in advance
     
  2. MUDNUTT

    MUDNUTT 1/2 ton status

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    depends on your axle gearing and tire size. ive got 3.73's and 33's and at 75mph im turning 27 or 2800 rpm.

    deck
     
  3. solowookie

    solowookie 1/2 ton status

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    yea it isn't a big deal... your RPM's will probably be a bit higher, but people ran like this for YEARS
     
  4. 73k5blazer

    73k5blazer Unplug the matrix cable from the back of your head Premium Member

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    It all depends on your tire size, rear end, and transfer case gearing.
    The SM465 has a 1:1 4th gear, and no overdrive.
    Goto:
    http://www.jeeptech.com/javaAps/gta.html
    (enter 1.0 for fifth, entering zeros causes problems.....)

    BlazerMan
     
  5. kickinasphalt383

    kickinasphalt383 1/2 ton status

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    at 70 i am at about 3000rpm with 4.56s and 36s with a diesel... thats screamin! but for you gassers its not that bad
     
  6. TXsizeK5

    TXsizeK5 1/2 ton status

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    Yeah same here... 35's and 4.56 gears going down the highway keepin up with people i rev 2.9k-3.2k
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    At 60, with 33's and 3.42's, I'm turning 2200 or so, which is perfect for the motor that is in it. Excellent mileage, plenty of power.
     
  8. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    What trans do you have now? I have always heard that the TH400 and the SM465 have the same gearing 1-2-3 vs. 2-3-4. So unless you have a 700R4, it should be very much the same... except now you'll have to row the gears! /forums/images/icons/cool.gif

    I am doing a swap from a TH400 to the SM465/205 hydro setup. Trust me, I'll be posting ASAP the results of that mod... I can't wait to drive her again!
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    With the same gearing the SM 465 will cause it to run with slightly lower RPM...similar to a lock-up equipped automatic in 'drive'

    Dan, you could see a 200 rpm drop in cruise rpm...

    Rene
     
  10. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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  11. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Pardon the gramatical error, but-

    YOU AIN'T LYING RENE! /forums/images/icons/laugh.gif
     
  12. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    3 rd is 1.70:1 not 1.57:1

    Rene
     
  13. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Guess the 400 has different gearing than the 465...
    http://www.jeeptech.com/convtrans/gm/gmth400id.html

    Rene, according to both sites I looked at, they say that the 465 has a 1.57 3rd gear. You know something that I don't? /forums/images/icons/smile.gif
     
  14. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Yeah, both web sites are wrong./forums/images/icons/smile.gif

    If you keep searching you'll find reference to both ratio's. MJ recently took the time to calculate the true ratio in a semi-disassembled SM465 and confirmed the third gear ratio was 1.70:1. I trust MJ a lot more than a web site posting hearsay.

    As for the cruise rpm, a manual will always turn less rpm at the same speed in 1:1 than an auto unless the auto is a lock-up convertor style like the 700R4.

    Rene
     
  15. 84_Chevy_K10

    84_Chevy_K10 Banned

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    mj counted. 3rd gear is 1.70:1.

    TH 400 is 2.48 1.48 1.00 I believe
     
  16. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Well, I guess I will have to look up that thread, huh? Thanks for the good info Rene!

    And just to clarify, I completely agree with the statement you made about the RPMs dropping somwhat due to the "locked" pressure plate/flywheel vs. the slightly-slipping non-locking auto converter! /forums/images/icons/laugh.gif I know what you mean...

    That, and I can't wait for the power gains... after all the 400 is the LEAST efficient auto trans out there... I don't care how tough it was! /forums/images/icons/smile.gif But enough about me, I have hijacked this thread enough already!!! /forums/images/icons/laugh.gif Sorry!

    -Dan
     
  17. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    You'll love the granny gear...then again winning races is prety tough to do with the SM465./forums/images/icons/wink.gif It's too hard to powershift it./forums/images/icons/smile.gif
    <blockquote><font class="small">In reply to:</font><hr>

    I have hijacked this thread enough

    <hr></blockquote>
    Me too/forums/images/icons/blush.gif

    Rene
     

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