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Transmission

Discussion in 'The Hokey Ass Message Board' started by buddy graham, Jan 28, 2012.

  1. buddy graham
    Joined: Jan 12, 2011
    Posts: 40

    buddy graham
    Member
    from irving tx.

    I am installing a 327 engine in my 47 ford coupe I would like to know what would be a good overdrive transmission and best fit I am thinking a 700 r4 I have a 8.8 355 ratio rear end thanks
     
  2. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,355

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    If you still have, and want to retain, the "X" member, the 700R4 is a bit large for that. Checkout the dimensions of a 2004R...same length as a TH350.....either of which will likely require some modification of the "X" member, but less than a 700R4, I believe.

    Also, you may want check the Chassis Engineering website. Seems to me they have some nicely made bolt-in kits for this very purpose.

    Ray
     
  3. mike hohnstein
    Joined: Dec 4, 2011
    Posts: 262

    mike hohnstein
    BANNED
    from wisconsin

    I vote for 4.11 rear gear, 3.9 @ the least.
     
  4. xxzzy999
    Joined: Apr 8, 2011
    Posts: 143

    xxzzy999
    Member

    Buddy,

    The 700R4 has a low 1st gear (3.07) compared to the TH350s (3.52) and TH400s (3.48). So, as an example, a 3.08 rear end in a 700R4 will launch like a TH350 or TH400 with 3.77 gears. Assuming 27 inch tires.

    Bottom line, So, a 700R4 with a 3.55 rear will be fine (launch faster than TH350 with 4.11s), and you'll have OD for the highway gas mileage.

    Regards,
    X
     

  5. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,355

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    uuuhhhhhhh.......that's 2.52 and 2.48, respectively...... I make typos all the time too :)

    and my reference to a 350 was merely as to it's length..not recommending it for this build...the OP clearly stated he wanted OD trans........btw, the 2004R has a 2.74 first gear.

    tough night or just no coffee yet?

    Ray
     
  6. mike hohnstein
    Joined: Dec 4, 2011
    Posts: 262

    mike hohnstein
    BANNED
    from wisconsin

     
  7. Cerberus
    Joined: May 24, 2010
    Posts: 1,392

    Cerberus
    Member

    All depends on what you want. Both the 700R4 and the 200 4R are nice OD trannys. I chose the 200 4R to put behind my 350 V8 that had a TH350 for two reasons: I like the close gear spacing of the 200 4R, and didn't have to shorten the driveshaft.
     
  8. xxzzy999
    Joined: Apr 8, 2011
    Posts: 143

    xxzzy999
    Member

     
    Last edited: Jan 28, 2012
  9. Cerberus
    Joined: May 24, 2010
    Posts: 1,392

    Cerberus
    Member

    As with any overdrive transmission, when there is excessive downshifting you simply take it out of overdrive and put it in drive. I have to do this occasionally in bumper to bumper traffic when speeds are around 40-50 mph. I installed a 200 R4/ 2200 stall conv behind a mild Chevy 350 with a 3.42 posi. Tires are 25.63" tall (225/60 x 15) and at 65 mph doing 1,955 rpm.:D
     
  10. mike hohnstein
    Joined: Dec 4, 2011
    Posts: 262

    mike hohnstein
    BANNED
    from wisconsin

    Yeah well I guess we deal with different realities, or at least move in vastly different social circles. If a guy has a 3.55 don't need an OD and if he has a engine that's happy @ 2000 cruise I hate it for him. How boring, like cruising @ 65. I rarely see a customer that has a cam that will idle under 1500. I cruise the damn Wanderlodge @ 75 to keep from getting run over by the big trucks.
     
  11. Cerberus
    Joined: May 24, 2010
    Posts: 1,392

    Cerberus
    Member

    I replaced the M21 in my '56 Chevy with a TKO600. Engine is a mild 350 with a 3.70 posi. At 70 mph it was turning 3400 rpm and I was getting passed by Honda Civics on long trips. After the TKO600 install it now turns a reasonable 2719 rpm at 70 mph, and the Honda Civics breathe my exhaust, if I want to get it on.
     
  12. xxzzy999
    Joined: Apr 8, 2011
    Posts: 143

    xxzzy999
    Member


    ------------------

    I used 65mph to match the 2000 rpm of the converter lockup in OD in my example... not as a typical crusing speed, especially on modern freeways.

    Buddy lives in the DFW metroplex (i.e. Irving, TX) where folks generally go 75+mph on the freeways and tollways. So, at these speeds in OD he's well out of downshift range with 3.55s in OD with the 700R4.

    In my example, Buddy will be turning 2300 rpm at 75mph with 3.55s vs. 2700 rpm at 75mph with 4.11s. The 3.55s is easier on the wallet when gas gets to $4+/gal. The 700R4s low 1st gear gives him the best of both worlds without having to sacrifice gas mileage by using 4.11s.

    Not saying your wrong, but to just through out 4.11s without some explanation or example doesn't really help much.

    To each his own....

    Regards,
    X
     
  13. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 9,214

    mgtstumpy
    Member

    If you go a 700R you most likely will need to fabricate a new centre section to your OEM frame and trim the leg on the passenger side x-member due to the width of the 700's wider pan. I've seen bolt in kits that make it easy. My '35 has 3.5:1 Jag IRS with 235:75:15's tyres and turns 2k rpm at 60mph.
     
  14. mike hohnstein
    Joined: Dec 4, 2011
    Posts: 262

    mike hohnstein
    BANNED
    from wisconsin

    I guess I stumbled into the wrong group, thought brisk acceleration was part of the program, probably want to run on regular gas too. Whatever. My shop manager says he see's 2300 @ 75 with 4.11 and 26" tires w/700 trans and calls into question some of the calcs bandied about here, I'm gone from this one.
     
  15. I have a 700r behind my hemi with 3.55 gears and love it. Great for cruizing down the highway and when you want to play it has a great first gear.
     
  16. nexxussian
    Joined: Mar 14, 2007
    Posts: 3,240

    nexxussian
    Member

    Mr buddy, as some have mentioned, how hot your 327 is, and what size rear tire you have will help immensely in the reccomendation of which trans is better.

    If your 327 is stock, which tune (300 HP, 360? Makes a heck of a diference).
     
  17. xxzzy999
    Joined: Apr 8, 2011
    Posts: 143

    xxzzy999
    Member

    ------------------

    Not even close... boss-man needs to get his speedo checked. He would be going 61.8mph using the above scenario.

    I see you still don't get it...

    The OP "will have" very brisk acceleration with 3.55s in a 700R4... similar to a TH350 with 4.30s because of the 700R4s very low 1st gear.

    Regards,
    X
     
  18. xxzzy999
    Joined: Apr 8, 2011
    Posts: 143

    xxzzy999
    Member

    ----------------------------------

    Nex,

    Pay attention! There's going to be a test....

    We discussing which rear end gearing is best for a 700R4 trans in a 1947 Ford Coupe with a 327 being driven by Buuddy Graham, a retired older gentleman living in a large metropolitan area.... :)

    Regards,
    X
     
  19. Cerberus
    Joined: May 24, 2010
    Posts: 1,392

    Cerberus
    Member

    Must have his spinnaker out with a good tail wind.
     
  20. nexxussian
    Joined: Mar 14, 2007
    Posts: 3,240

    nexxussian
    Member


    Yeah, all I had to go by is what the OP wrote in his orriginal (only) post in this thead.

    Sounds like he's open for other options, just thought I would mention those two pieces of info are important for an accurate suggestion, just I case he cares to elaborate or post again. ;)
     

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