727 Output Shaft compatibility

Engine, Transmission & Driveline

  1. jcslocum

    jcslocum New Member

    Messages:
    13
    Likes Received:
    6
    Joined:
    Oct 5, 2019
    Location:
    Eastern Shore, MD
    Hello transmission experts. I have a 1966 Fury 3 (318 Poly) wagon with a blowed up 727 trans. I can rebuild the current '66 727 but it has very limited options available for this year/model, particularly the torque converter. I plan an engine swap later this year so want to upgrade the trans now and use it for the summer.

    I have picked up a 78 727 from a motor home with low miles BUT it has the E-Brake on the tail-shaft. The question, is will my current '66 727 output shaft work with the modern heavy duty 727? I recall reading somewhere that the inner end of the shaft won't match up to gear cluster inside the trans. Does anyone know for sure?? I can pickup a more modern tailshaft and use that but need definitive info on this issue.

    Thanks for any help. I really appreciate it.
     
  2. 70bigblockdodge

    70bigblockdodge Old Man with a Hat FCBO Gold Member

    Messages:
    11,675
    Likes Received:
    4798
    Joined:
    Jan 19, 2013
    Location:
    Avonmore Pa.
    That's the way I understand it. The early and later than 74,75,76 not sure of year exactly spline shape changed. It will go together but is on the clock for possible failure. I would put the 78 front into your case. Better pump support, possible wide drum, and 4 pinion.
     
  3. jcslocum

    jcslocum New Member

    Messages:
    13
    Likes Received:
    6
    Joined:
    Oct 5, 2019
    Location:
    Eastern Shore, MD
    Thanks for the info.

    So, use the new 727 stuff in the front half of the trans and retain the old stuff in the back half.

    So you think I shouldn't worry about a new output shaft?
     
  4. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

    Messages:
    2,596
    Likes Received:
    3178
    Joined:
    Nov 22, 2010
    Location:
    Kingston Ontario Eh?
    From the Poly, what engine upgrade you planning?? LA block? Or big block?
    Frankenstiening the RV trans is not cost effective even if you got it for free it will be a headache.
    Spending a dollar at the tranny shop just to save a nickle.
    Best off getting a early 70's passenger car 727 core and rebuild it.
    Even a Loadflite from a 70's D100 pickup or tradesman van will work.
    Best of both worlds...fits right behind the Poly and broadens your convertor choices.
    We rebuilt a 72 727 and put in a later input shaft. The car did not move..trans was a lump until we put back proper input shaft.
    Hope this helps just my 2 cents
     
  5. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

    Messages:
    2,596
    Likes Received:
    3178
    Joined:
    Nov 22, 2010
    Location:
    Kingston Ontario Eh?
    ...And in the valve body the 3-2 part throttle kickdown feature not present in his 66 trans.
    I butchered a truck 1973 727 and used parts from it into the BoaB's big block 1968 727.
    But left the input and output shafts alone.
    As you mentioned the RV innards includes the 4 pinion just like the Hemi 727.
    Also today's modern technology and materials clutch band quality is much better.
     
    • Agree Agree x 1
  6. 70bigblockdodge

    70bigblockdodge Old Man with a Hat FCBO Gold Member

    Messages:
    11,675
    Likes Received:
    4798
    Joined:
    Jan 19, 2013
    Location:
    Avonmore Pa.
    Yep valve body also from 78.
    Just take the pump and input, front drum
    Not the whole case and what not.
     
    • Thanks! Thanks! x 1
    • Agree Agree x 1
  7. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

    Messages:
    2,596
    Likes Received:
    3178
    Joined:
    Nov 22, 2010
    Location:
    Kingston Ontario Eh?
    tJbRXNrmo7X2FBvSq85S4gpmgc8aVk51fP3YJq6lDm19eR5zMWvr3Prv90AOWPek3mRTVgGt_oFO8E6DD6Oqi8PsfzloksJw.jpg
    Use your 1966 casing but with RV guts.
    Toss the RV rear casing half..
    :thumbsup:
     
    Last edited: Feb 11, 2020
  8. 70bigblockdodge

    70bigblockdodge Old Man with a Hat FCBO Gold Member

    Messages:
    11,675
    Likes Received:
    4798
    Joined:
    Jan 19, 2013
    Location:
    Avonmore Pa.
    No front half is good casing. Send it to me instead of rising.
     
  9. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

    Messages:
    2,596
    Likes Received:
    3178
    Joined:
    Nov 22, 2010
    Location:
    Kingston Ontario Eh?
    edited,lol
     
    • Thanks! Thanks! x 1
  10. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

    Messages:
    2,596
    Likes Received:
    3178
    Joined:
    Nov 22, 2010
    Location:
    Kingston Ontario Eh?
    I hope the OP realizes the A/LA and B/RB bell housings has different bolt patterns that do not interchange...
     
  11. jcslocum

    jcslocum New Member

    Messages:
    13
    Likes Received:
    6
    Joined:
    Oct 5, 2019
    Location:
    Eastern Shore, MD
    Actually, I'm going old school Hemi. I have a 354 on the stand with 10:1 pistons mild cam and a 4bbl.

    What if I transplant the RV trans with the new tailshaft. It's a 727 non-lockup trans.

    That is sort of the plan. I was worried about the output shaft not matching.

    Yes, I'm aware that the bolt patterns are different. The "new" RV trans is from a 440/727 combination.
     
  12. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

    Messages:
    2,596
    Likes Received:
    3178
    Joined:
    Nov 22, 2010
    Location:
    Kingston Ontario Eh?
    So..you answered your own question and still not getting it
    The 440/727 will not bolt up to the Poly--different bolt pattern.
    Yer putting the cart in front of the donkey here..
    A waste of time trying to change the tail stock,output shaft and find out it will not bolt to the Poly.
    Best to take the good guts out of the RV and put them in your 66 727.
    That is a trans I would buy when no longer needed.
    As for the future Hemi,possibly an adaptor plate to match its bell housing or a different trans altogether.
    Done repeating myself :BangHead:
     
  13. 70bigblockdodge

    70bigblockdodge Old Man with a Hat FCBO Gold Member

    Messages:
    11,675
    Likes Received:
    4798
    Joined:
    Jan 19, 2013
    Location:
    Avonmore Pa.
    I'm not sure what year the bellhousing is not part of the block and also the crank flange is different on some of those. I'm not too good with their intricacies, others here know better than I do.
     
  14. commando1

    commando1 Old Man Wearing a Hat on the Porch FCBO Gold Member

    Messages:
    33,145
    Likes Received:
    18220
    Joined:
    Mar 10, 2011
    Location:
    FUHOA Reservation, Sebring, Florida
    Lea, take a time out over at the Gold Member Rant thread... :lol:
     
    • Thanks! Thanks! x 1
  15. Lefty71

    Lefty71 Active Member

    Messages:
    231
    Likes Received:
    87
    Joined:
    Mar 17, 2018
    Location:
    Ohio
    The spline angle is different on the front of that output shaft, for sure!
     
  16. twostick

    twostick Senior Member

    Messages:
    1,830
    Likes Received:
    825
    Joined:
    Dec 13, 2012
    Location:
    Beautiful Downtown Roebuck Ont.
    This.

    Look up the procedure to properly swap the later front pump into your 66 trans. It's a common upgrade. Use the later valve body with the part throttle kick down and finish with new bands and clutches.

    4 pin planetaries are highly overrated. The aluminum splines in the hub are the weak link, not the pinions. A super stock racer friend of mine used to remove 2 pinions on a 4 pin set on their AA/SS Hemi and never ever broke a pinion. Stripped out the splines on a few figuring out how many laps they would take before failure.

    Kevin
     
    • Thanks! Thanks! x 1
  17. jcslocum

    jcslocum New Member

    Messages:
    13
    Likes Received:
    6
    Joined:
    Oct 5, 2019
    Location:
    Eastern Shore, MD
    Thanks for your patience and info. I will now transplant the newer front bits into the old trans with new clutches and bands.