Register now to get rid of these ads!

tranny pre-oil

Discussion in 'The Hokey Ass Message Board' started by EARLYHEMIBILL, Oct 7, 2012.

  1. EARLYHEMIBILL
    Joined: Apr 7, 2008
    Posts: 465

    EARLYHEMIBILL
    Member
    from ?

    I've been wondering about something for sometime. Before I fire up a rebuilt engine I prelube it with a drill until I hear no more air in the system. What about the tranny? Should it also be primed before startup? I have a fresh rebuilt 727 and am curious about it's innards before the fluid is all thru the system and converter.
     
  2. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 9,214

    mgtstumpy
    Member

    Not sure about a torqueflight however I filled the convertor for my 700R before attaching the transmission to the SBC in my '35. I then filled the transmission before I started the engine and wound it over to pump fluid through everything before I actually tried to start the engine. It purged the system of air and put fluid in the coolant lines and where it needed to be. Once the engine started I checked the transmission fluid level and only had to top it up. I wouldn't run it dry under any circumstances. If there is no fluid in the convertor now I'm not sure what your next step is, sounds like it may take longer to purge the system.
     
  3. Well stated,
    Its amazing how much oil a dry torque converter holds
     
  4. zep058
    Joined: Jan 9, 2007
    Posts: 599

    zep058
    Member

    If 727s sit for a while I read they drain out of the converter and running in neutral not park allows the pump to refil the converter when started.
     
    Last edited: Oct 8, 2012

  5. Don's Hot Rods
    Joined: Oct 7, 2005
    Posts: 8,319

    Don's Hot Rods
    Member
    from florida

    Put a quart in the convertor and then install it into the transmission, making sure it is seated all the way in. To keep the convertor from slipping forward and becoming disengaged from the front pump, bolt a small combination wrench into one of the splash sheild holes so it acts as a "stop", pressing against the convertor to keep it in place.

    Bolt the trans to the bellhousing area and you can now remove the combination wrench and pull the convertor slightly forward to mate with the flexplate. Put 5 more quarts of fluid in the pan, and then start the motor and let it run for about 30 seconds. Check the dipstick and the fluid level should have gone down. Add a couple more quarts and start it again for 30 seconds. Check the fluid level and add fluid to bring it to the FULL mark. Start the engine again for 30 seconds and check the dipstick again, keep adding fluid until it remains at the FULL mark on the stick.

    The 727 usually holds about 8.5 to 9.5 quarts total.

    Don
     
  6. Bill, of course my post will get a bunch of naysayers, the " poke an hope " mechanics slapping shit together their whole lives, but if you want the advice given to me by the head of the company who does our racing automatics here goes.

    After getting things warmed up to temp, with the engine idling, hold your foot firmly down on the stop pedal. Now SLOWLY move the shift lever through all the gear positions stopping and pausing in each one and counting 1-one thousand, to 3 one thousand in each position. Do this twice all the way from Park to low or first gear, back to park, and repeat. Now check your fluid and add or subtract to the correct level required. All the best.
     
  7. CutawayAl
    Joined: Aug 3, 2009
    Posts: 2,144

    CutawayAl
    Member
    from MI

    In all the automatic transmissions I knew of, oil supply to the converter happens after the trans itself has sufficient oil pressure. So, starting with a partially filled converter isn't as bad as it sounds.

    The shifting through the gears procedure that Traditions Racing described will make a small difference in the dipstick reading. I worked for the engineering garage of a trans manufacturer for a while. That routine was standard required practice for a newly installed trans.
     
  8. EARLYHEMIBILL
    Joined: Apr 7, 2008
    Posts: 465

    EARLYHEMIBILL
    Member
    from ?

    I ask this question because I put a 727 behind my Desoto hemi to get the cam broke in and ran it for about 20 minutes. The fluid level never went down the stick as though never pumped up. I put alot of fluid in the torque converter before I fired it and filled it to full on the stick. It came from a guy's pro street Cuda. Said he wanted to go back to the stock 4-speed. Am wondering now if I bought a pig in a poke.
     
  9. TR Waters
    Joined: Nov 18, 2006
    Posts: 1,439

    TR Waters
    Member
    from Vermont
    1. Early Hemi Tech

    As stated, you will need to run it through the gears.
     
  10. kma4444
    Joined: Sep 24, 2008
    Posts: 197

    kma4444
    Member

    As mentioned earlier, the Torqueflight doesn't supply hydraulic pressure in park, it needs to be in neutral or, obviously, any of the drive positions. If you started it and didn't come out of park, the level is not likely to change.
     
  11. KIRK!
    Joined: Feb 20, 2002
    Posts: 12,031

    KIRK!
    Member

    Oh transmission, the title got me all excited.
     
  12. Dane
    Joined: May 6, 2010
    Posts: 1,351

    Dane
    Member
    from Soquel, CA

    I've never had problems on first start up with a 727 in park and the drive shaft installed. If you're worried, shift the trans into neutral soon after starting the engine for about 30 seconds, then back to park and you should be good to go. You'll probably hear the engine rpm's drop a bit when the pump in the trans primes and starts pushing fluid through the system. Two things - As soon as you start picking up fluid the level in the pan will drop fast and you'll need to stop and add fluid. The second is MAKE SURE the wheels are off the ground because if you miss neutral you'll have the car running down the road, through the garage wall, or worse...
     
  13. 40FordGuy
    Joined: Mar 24, 2008
    Posts: 2,907

    40FordGuy
    Member

    What Dane said !!!!!!!!!!!!

    4TTRUK
     
  14. EARLYHEMIBILL
    Joined: Apr 7, 2008
    Posts: 465

    EARLYHEMIBILL
    Member
    from ?

    Thanks for the help. I really appreciate it. Bill
     
  15. moparjack44
    Joined: Nov 8, 2005
    Posts: 659

    moparjack44
    Member

    It is always a good idea, with a torquflite, to to start the car in "N"uetral for a few seconds. Also, fluid must be checked in "N"uetral.
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.