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Thread: 1994 4R70W - transmission of doom

  1. #16
    Join Date
    Dec 2007
    Location
    Salem, OR
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    6,335
    Quote Originally Posted by davec73 View Post

    are your thunderbird your only mode of transportation?

    My '90 Anny was (since 2008) until last Nov. when it needed some body work. I picked up another vehicle (2002 Windstar; 3.8L) in the mean time and now the SC mostly just sits. Runs fine, but I got nervous about it being my only transportation. It's never left me stranded, tho.
    Last edited by KMT; 08-05-2017 at 03:11 PM.

  2. #17
    Join Date
    May 2012
    Location
    Oregon
    Posts
    768
    We have a Sienna van and two '94 Birds. One is a Super Coupe and on is an LX. Wife is out of town all week. Usually its not this much of a bother. Got the SC back in good order though with a simple parking brake adjustment.

    Now gotta figure out the LX. I've got all the trans bolts out and everything is unmounted EXCEPT the torque converter. I can't get the trans down. Might need to turn the crank with a 3 foot breaker bar so I can get the TC nuts off. It should come out then. I should have known better last night when I needed to use the starter to turn the TC to put all the nuts back on.... shame on me for being impatient.

  3. #18
    Join Date
    Sep 2004
    Location
    Herrin Illinois
    Posts
    3,385
    Quote Originally Posted by potshotscott View Post
    We have a Sienna van and two '94 Birds. One is a Super Coupe and on is an LX. Wife is out of town all week. Usually its not this much of a bother. Got the SC back in good order though with a simple parking brake adjustment.

    Now gotta figure out the LX. I've got all the trans bolts out and everything is unmounted EXCEPT the torque converter. I can't get the trans down. Might need to turn the crank with a 3 foot breaker bar so I can get the TC nuts off. It should come out then. I should have known better last night when I needed to use the starter to turn the TC to put all the nuts back on.... shame on me for being impatient.
    hopefully you can just seperate the tc3 and flex plate spin the tc3 and it will go into place.
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  4. #19
    Join Date
    Feb 2003
    Location
    Tinton Falls, NJ
    Posts
    1,502
    If all the bolts are out of the trans, support it with a jack and pry the trans back an inch or so off the motor, and that should allow the motor to turn over freely. At this point though, if you bolted the trans all the way tight with the TC not seated, you have at the very least damaged the front pump, and possibly damaged the converter, and possibly the whole trans.

  5. #20
    Join Date
    May 2012
    Location
    Oregon
    Posts
    768
    I never started the car. I separated the TC and the trans today and then got it put back together correctly. I need to put the exhaust back on the car and then fill the transmission with fluid. I'm no expert but I don't think I've ruined anything. Crossing my fingers for tomorrow.

  6. #21
    Join Date
    May 2012
    Location
    Oregon
    Posts
    768
    Well as luck would have it I did NOT ruin anything. Put 13 Quarts of fluid in her and took it out for a spin. Shifts VERY nicely. Wished I had a method to check PCM code version - will look into that later. Checked fluid when I got back from the test drive and it appears as though it's full at 13 Quarts to the "hot" line (I did take it out on the freeway and open it up a little bit too).

    Pretty happy to have this beast back on the road for my daughter. Now with trans, filter and fluid I'm into this car $1000 including purchase price. It's so quiet that now I am reminded that this car might need rear wheel bearings or some differential work since there's a very small low frequency whine back there. When that/those go perhaps it will be time to send it off to pasture.

    Thanks for the help all

  7. #22
    Join Date
    Oct 2016
    Posts
    4

    4r70w

    Quote Originally Posted by potshotscott View Post
    Well as luck would have it I did NOT ruin anything. Put 13 Quarts of fluid in her and took it out for a spin. Shifts VERY nicely. Wished I had a method to check PCM code version - will look into that later. Checked fluid when I got back from the test drive and it appears as though it's full at 13 Quarts to the "hot" line (I did take it out on the freeway and open it up a little bit too).

    Pretty happy to have this beast back on the road for my daughter. Now with trans, filter and fluid I'm into this car $1000 including purchase price. It's so quiet that now I am reminded that this car might need rear wheel bearings or some differential work since there's a very small low frequency whine back there. When that/those go perhaps it will be time to send it off to pasture.

    Thanks for the help all
    Your 4R70W innards will fit and are an improvement for the AOD that are used in the 89-91 SC (and other birds as well). 4R70W have the wider 2" overdrive drum and other changes that will help the issues with the AOD. Transmissions are not that hard to overhaul, mostly a good overhaul manual, a place to wrestle with it and the best quality snap ring pliers you can find.
    Using Alta "red" frictions and steels the AOD with 4R70W innards becomes a decent transmission. The strongest version of the 4R70W is from the F-150. It's only a matter of time before my 91 has overdrive problems and I'll be looking for that 4R70W to swap in the better parts. Also.. the Torque Converter and input shafts are totally different between the two automatics. The AOD has a weak shaft-in-shaft design (two seatings on the Torque Converter installation, 4R70W is one seating like most other Torque Converters are..AOD's are the oddball).
    Your 4R70W has value as a improved swap core to the AOD. The AOD body accepts all of the 4R70W innards with no modification. Use the AOD valve body with a shift kit and the same TV settings determined by pressure gauge, it'll be a good unit for many a mile. You are very fortunate you did not fracture the cast iron front pump gear tabs. T/C snouts also have been made different diameters in Fords from time to time. C6 460 used in Lincolns are not the same as T-Bird or Mercs. Ask me how I know that from first hand experience!$$!

  8. #23
    Join Date
    May 2012
    Location
    Oregon
    Posts
    768
    I was going to keep the old core but I have a 3.8 SC and a 92 5.0 LX of which none are compatible. The 5.0 has a dead transmission and I just replace/rebuild a 3.8/5.0 4R70W for it when the time frees up to work on Mustang that's been sitting for a while now. If you're anywhere near Oregon I'm about to list the 4R70W core for cheap on Craig's.

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