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Allison Flush Techniques

Discussion in 'Do It Yourself Articles - How To's & Product Revie' started by hoot, May 10, 2008.

  1. hoot

    hoot Recruit

    May 10, 2008
    SE PA


    The Basics.....

    I installed the deep pan/deep pan suction filter last night and switched to Transynd. Bought a 5 gal bucket of Transynd from the Allison dealer for $125, and used 4.75 gal with the disconnected cooler line. Kept a qt for future use/spin on filter changes.

    1) Added 10.5 qts Transynd and pre-filled the new spin on filter after swaping pans.

    2) Disconnected the FROM COOLER line, used a section of garden hose into a 1 gal pail (I had two 1 gal pails on hand)

    3) Remote started/shut off after about 1+ gal out. The ATF pumps out pretty fast

    4) Put in 2 gal+ or so Transynd, repeated #3,

    5) Re-attached FROM COOLER LINE.

    6) Check ATF level, COLD and HOT as outlined in the Diesel Supplement.

    A big THANKS to Kennedy for the tip on using the remote start (previous post) to do this, worked like a charm especially when you are working alone.

    More compiled notes....

    No torque sequence described in the Helm's manual. I put them in finger tight, moving from corner/corner and side/side etc. Then torqued/tightened them a little at a time doing the same.
    TORQUE PAN BOLTS = 20 ft lbs
    TORQUE DRAIN PLUG = 25 ft lbs

    There are two lines on the passenger's side of the transmission up front near
    the converter; the lower one is the "To Cooler" line and the upper one is the
    "From Cooler" line. If you disconnect the "From Cooler" line from the transmission
    you can put it in a bucket and flush to your heart's content.

    In case you haven't seen the Jiffy-Tite style connector before: Slide back the
    plastic cover over the c-clip-shaped spring, then use a small screwdriver to
    pop the spring out of its groove.
    because those springs just love to go flying off into some dark hole where
    you'll never find it. Once the spring is out,just pull and wiggle on the line
    until it comes out of the fitting. As soon as you have the line out you can put
    the spring back into its groove so you don't lose it - the line will snap right
    back into place when you're done, even with the spring there.
    Be careful not to damage the o-rings when re-installing.

    A few other tips for your pan swap...
    When you're removing the old suction filter: if the seal stays in the bore, don't use a screwdriver
    to pry it out. Just wipe off the neck of the filter, wipe out the seal, and reinstall the filter.
    **** it sideways a bit and pull down again - the seal should come out with it.>

    Your refill quantity will be 10.5 quarts or roughly 2.5 gallons. This
    is with the deep pan, and does not include the cooler lines. The torque
    converter holds roughly 4.5 quarts in addition to the 10.5 quarts. Obviously
    this means you will have a mixture of TranSynd and Dexron. The two fluids
    are compatible.

    I bought a 5 gal pail of Transynd ($125) and poured two quarts in clean
    containers just in case I needed to add any in the future. The remaining
    4.5 gal went through the tranny - start the engine, run a few quarts out,
    shut off the engine, add more Transynd and repeat until it was all in.
    Lucked out that my final check was right on the correct fill level
    (checked HOT as per the manuals).

    If you refill with Transynd as I did, you will have about 58% Transynd.
    After the second fluid change using Transynd, you will have about 80%
    and over 90% at the third change. If you plan on switching to TranSynd I
    recommend you buy 3 Gallons and pull the "From Cooler" line loose from
    the transmission (install a short hose into a bucket) and start the truck
    up to flush (the majority) the Dexron 2 out... I over fill the pan by 2-3
    quarts when I'm doing this...

    You "feed and bleed" , *DO NOT* pump your tranny dry!! You install
    your filters, pans and whatnots, fill her up to the "cold" mark with new
    fluid. Then hook up your flush hose and also feed new fluid down the
    dipstick hole while you are pumping. After pumping about 2-1/2 to 3 gallons,
    stop, reconnect the flush line, fill back up to the cold mark with new
    fluid. Then start it up and work your way through all the gears
    (holding the brakes), pausing for a few seconds in each selection.
    Take her out for a spin around the block and drive for about 15-3O minutes.
    Then come back and do the through-the-gears routine again before winding up
    in Park and while still idling check for fluid at the "Hot" level. Adjust
    as necessary and you are set!

    No.. What I'm saying is after you have drained the fluid and replaced
    the spin-on filter you can remove the "From Cooler" line and install
    a short piece of hose into a bucket... From that point I hope you measured
    about how much fluid you took out of the trans including the filter...
    Now install the same amount +2-3 more quarts and start the truck up
    (it may take a few seconds for the fluid to start coming out so don't
    be alarmed if it does this) You should be able to tell when the Dexron III
    stops and the TranSynd starts. At that point cut the
    truck off and reinstall the Cooler Line.. Now crank the truck back up
    (check for leaks) and place it in Drive-Neutral-Reverse then back to PARK..
    Do this a few times then check the Fluid level.. It should be on the "COLD FULL"
    line if not add Fluid until.. Then as idle chatter said, drive it around
    to get the trans temp up then check to see if it's at the HOT FULL mark
    if not add fluid..

    Pan bolt torque - 18-21 ft-lbs.
    Drain plug torque - 25 ft-lbs.

    Pan: 29536522 $48.87 PHOTO
    Filter-Suction, Deep: 29537966 $21.22 PHOTO
    Spin on filter: 29537268 $8.87 PHOTO

    ...Prices may vary.....

    Last edited: May 10, 2008
  2. busdriver75

    busdriver75 Busier than hell...

    May 7, 2008
    NW Ohio
    thanks hoot! i'll be giving this a whirl next oil change. hopefully i can add some more pics!
  3. upbrakie

    upbrakie Recruit

    May 9, 2008
    Topeka, KS
    Great write up! Where would us noob's be without such great help out there like you. Thanks!
  4. BudTX

    BudTX Edjumacated Redneck

    Let's make this one a sticky.
  5. modified

    modified modified

    May 16, 2008
    NE Wisconsin
  6. Marauderer

    Marauderer Grumpy Old Cur***geon

    Dec 8, 2009
    Powder Springs, GA
    Thanks for assembling this info Hoot. I am getting ready to do mine this week.
  7. hoot

    hoot Recruit

    May 10, 2008
    SE PA
    No problem. Guy up the street just picked up an 05 Dmax. I'm his adviser now :hihi:
  8. Marauderer

    Marauderer Grumpy Old Cur***geon

    Dec 8, 2009
    Powder Springs, GA
    Wow, it has been a while. I ended up with leaky hoses and3 replaced them with the Alligator kit so I didn't really need a flush so to speak. In anothe 20K mi I will be doing the flush and changing over to Transend 295 equivalent.

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