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Thread: 727 Swap

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    Wolf360rt's Avatar
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    Default 727 Swap

    Hey guys I just happen to have a small block 727 trans and a trans break just taking up space in my Garage and I know the 727 will bolt up to the Magnum block but, what else it needed as in the Flex Plate, converter and computer. And ive heard that your ET will drop by almost a second due to the lack of the rotating mass of the OD unit is this true? I also have a full race ready 8-3/4 axle with 4.56 gears and a full locker just sitting around and its wide enough to fit under the truck I dont give a damn about not having 6 bolt on the truck anymore. So What do you guys think should I do it or what?
    Derrick (Big D)
    2000 Black Regcab Dakota R/T (14.29 @ 95.77mph) soon to have a Garret Gt42-02 74mm turbo.
    1968 Barracuda Notchback Big Block Turbo E85 project.. S488 88mm Turbo

    my mad ms paint skills

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    Just made that swap...Dropped 5 tenths the fist time down the track, but I was coming from a very good 46RE. I know I have room for improvement with the 727.

    You'll need a longer drive shaft, and a different tranny mount, and you will have to notch the trans case for the Crank trigger, and get the auto flashed out of the PCM...CELs will still be your friend.
    For strip, with limited street, do it. But the 4.56 gears and a 3 speed gonna get old if you spend much time over 60 mph.
    11.29 @ 117.83 All motor on Mars

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    Wolf360rt's Avatar
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    The truck is most likely gonna become an around town screw around toy so it wont spend much time above 60 unless im messing with someone..lol... and it wouldnt take much to swap out the 4.56 for something smaller.. Ive honestly never had the trans out of my truck myself to look at it is notching it a pretty easy job.. and does anyone sell the trans mount or is it something im gonna have to fab up.. Who can reFlash the pcm for me I have the performance pcm and dont wanna pay $450 for another one if I dont have to.
    Derrick (Big D)
    2000 Black Regcab Dakota R/T (14.29 @ 95.77mph) soon to have a Garret Gt42-02 74mm turbo.
    1968 Barracuda Notchback Big Block Turbo E85 project.. S488 88mm Turbo

    my mad ms paint skills

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    Quote Originally Posted by Adobedude View Post
    Just made that swap...Dropped 5 tenths the fist time down the track, but I was coming from a very good 46RE. I know I have room for improvement with the 727.

    You'll need a longer drive shaft, and a different tranny mount, and you will have to notch the trans case for the Crank trigger, and get the auto flashed out of the PCM...CELs will still be your friend.
    For strip, with limited street, do it. But the 4.56 gears and a 3 speed gonna get old if you spend much time over 60 mph.
    isn't there 727's out there with extra long tail shafts? i thought about a 727 when i had my trans done but my DS is long enough as it is.
    Fu·ror noun \ˈfyu̇r-ˌȯr, -ər\ : an angry or maniacal fit

  5. #5

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    if i remember right your have 3 diff. 727 tailshaft, you have a short, med. length one, and the long tail shaft.
    88 samurai
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    408dakota's Avatar
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    I was running a 727 but then changed to a built 904. I think I picked up a little more rwhp just from it being a lighter mass just like everyone was saying but if you are buying new I would recomend the 904. Mine was built and dynoed tested at 750 hp so I will last me a while. It had a trans brake in it but the guy who bought it new kept it for his new upgraded trans.
    LA 408, W2 heads, Indy Intake, Bigs carb, long tube headers with 3" dual exhaust no cat, Built 904 manual valve body trans with 2800 stall.

  7. #7

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    heres some pics
    short:

    med:

    long:
    Last edited by red R/T; 01-11-2009 at 10:52 PM.
    88 samurai
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    94 dakota
    01 dak r/t

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    Quote Originally Posted by red R/T View Post
    heres some pics
    short:

    med:

    long:
    nice

    anyone know the lengths of those compaired to the 46RE/RH's?
    Fu·ror noun \ˈfyu̇r-ˌȯr, -ər\ : an angry or maniacal fit

  9. #9

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    med length tailshaft is 20in and the long tailshaft is 26in

    i'll measurements for the 46re and the short tailshaft tomorrow
    88 samurai
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    94 dakota
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    Wolf360rt's Avatar
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    What Flex plate and converter will I have to run with this setup.. can I use the stock flex plate, and just a standard 727 converter.. and does the speedo read off the trans or the rear end or our trucks off the abs ring...
    Derrick (Big D)
    2000 Black Regcab Dakota R/T (14.29 @ 95.77mph) soon to have a Garret Gt42-02 74mm turbo.
    1968 Barracuda Notchback Big Block Turbo E85 project.. S488 88mm Turbo

    my mad ms paint skills

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