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Thread: 1994 4R70W - transmission of doom

  1. #1
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    1994 4R70W - transmission of doom

    Well, TSB-95-8-3 is coming back to haunt me. Again. tsb-95-8-3.pdf Odd shift going from 1st to 2nd as though it had a shift kit in it or a Jmod. Third gear shifts went whack yesterday. As I read this I feel as though I have two options.

    1. Buy the 1995 PCM and transmission at the wreckers for a grand total of $280 plus a core charge
    2. Buy the 1995 PCM and 2001-2002 transmission at the wreckers for about $350.00 plus core and then mod the TCC and a few other small items.

    It's clearly making metal. Which route would you go? I don't have the time or the money to rebuild the current unit or I'd be up for an awesome learning challenge.

    One other lame question - can I reuse my fluid if I strain it several times and run a clean magnet through it several times? This fluid isn't but a year old and while it's not really expensive it's not cheap either. I know it's a cheap-arse question.


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  2. #2
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    The 99+ trans is a way better starting point than the 94 or 95 trans. I wouldn't waste my time putting another 94/95 trans back in. And no, you can't re-use that fluid, unless your goal is to see how quickly you can kill the new trans.

  3. #3
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    Just my opinion, but any straining/filtering that might even come close to being effective would cost way more than new fluid - you'd be amazed at what can exist after the goings on seen in the pan at the moment, that you both can't see and can't remove casually. Feel your pain, but not worth it, I think.

  4. #4
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    Fluid is going to the recyclers at the dump. Going to source a 98-02 unit tomorrow and get the 95 PCM. Mod the trans harness in the car and call it macaroni.

  5. #5
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    Quote Originally Posted by potshotscott View Post
    ...and call it macaroni.
    👍

    G'luck w/it. Should be slick when done.

    Ken

  6. #6
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    Bought a 2002 unit at a wreckers that has about 60K on it. Is a recent arrival to the yard. Got it for $300.00 without a requirement for core. I think I'm going to keep my 94' unit and rebuild it some day. The service advisor at my local dealer is actually looking into a PCM flash for my LX OBD2 PCM. Might be able to get more life out of it yet!

  7. #7
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    Also make sure you flush your lines and cooler while at it...I flushed my converter also when I did my last rebuild and had the same crap in the pan. Last thing you'd want is garbage killing the new trans.

    -Tim
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  8. #8
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    Subscribed. Looking forward to see how this works out, should you decide to chronicle this build/swap.
    1994 white sc (Daily Driver)
    14 year sc owner
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    View http://www.sccoa.com/forums/garage_v...vehicle&id=107

    UP THE IRONS!!!

  9. #9
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    The last time I did this I got an 02' Mustang unit for the SC from a wrecker with 3000 miles on it. No joke - 3000 miles. This time around I need the 2002 4.6 trans and they literally had lemons. The first trans I took home looked okay until I pulled the pan and half cup of water came pouring out. Not to mention it was an 03 unit that didn't have the gearing for VSS on the output shaft. The second unit they tried to give me was an 02 with 150K on it. It had a broken tail shaft housing and yep, you guessed it - they pressure washed it before they tried to give it to me. I quickly searched their website on my phone and found a 95 LX unit with 123K on it that I asked them to get down off the shelf. Needless to say for convenience sake (and because all their late model units were junk) I took the 95 unit home. I got it installed last night. Need to put the final exhaust section back on, torque the drive shaft bolts and fill it with fluid/test.

    One interesting thing and I'm wondering - I could turn the engine by hand to get the old converter out. I could NOT turn the engine by hand but instead had to engage the starter to turn the flywheel enough to put all the nuts on. Anyone have any ideas? The only thing I can think of is I don't have the torque converter on correctly??? I have the Ford shop manual and can read/follow directions in sequence but failed to look at the orange dot on the converter/flywheel. 75% chance I failed to mate them. However - this is not the original TC.

    Thoughts?

  10. #10
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    Sounds like its binding from the tc not being seated. I had similar trouble and broke the input shaft from the pressure. I didn't even spin the engine yet. It just didn't feel right.

  11. #11
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    Okay - not wanting to risk anything I'm going to pull the transmission back out this morning to take a peek. Hopefully I can get this thing running tonight.

  12. #12
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    Quote Originally Posted by potshotscott View Post
    Okay - not wanting to risk anything I'm going to pull the transmission back out this morning to take a peek..
    Did you sanity check the snout size on the replacement TC with the hole in the crank/flywheel just to be safe? Did you confirm the TC was fully plunged and engaged into the trans before mating to the engine? Spin and push...

  13. #13
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    So TC size into the engine side looks great. I believe I failed to seat the TC correctly on the input shaft when I put it in last night. I'm trying to pull it out this morning with the TC still in the car but its jammed pretty good and I'm pretty tired from getting it in by myself last night with a single floor jack. As I was getting things set on the jack the TC slid out of the bell housing. I thought I had it mated correctly - must have been wrong.

    Another awesome fun thing is that now my SC has the "brake!" light on and the rears feel like they're dragging. Hopefully all I need to do is adjust the pull cable.... If I wasn't going to Houston on Monday for work I wouldn't be so stressed. If I had more money in the bank I'd haul the LX to the wreckers and consider selling the SC. Tinkering is fun, full tilt mechanic stuff every year (balancer, transmission, coolant flushes) is getting old. If I thought I could get half of what I've got in my SC out of it I'd be tempted to list her on Craigslist today.

  14. #14
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    [QUOTE=potshotscott;1111577]So TC size into the engine side looks great. I believe I failed to seat the TC correctly on the input shaft when I put it in last night. I'm trying to pull it out this morning with the TC still in the car but its jammed pretty good and I'm pretty tired from getting it in by myself last night with a single floor jack. As I was getting things set on the jack the TC slid out of the bell housing. I thought I had it mated correctly - must have been wrong.

    Another awesome fun thing is that now my SC has the "brake!" light on and the rears feel like they're dragging. Hopefully all I need to do is adjust the pull cable.... If I wasn't going to Houston on Monday for work I wouldn't be so stressed. If I had more money in the bank I'd haul the LX to the wreckers and consider selling the SC. Tinkering is fun, full tilt mechanic stuff every year (balancer, transmission, coolant flushes) is getting old. If I thought I could get half of what I've got in my SC out of it I'd be tempted to list her on Craigslist today.[/QUOTisE]

    are your thunderbird your only mode of transportation? If so that sucks 25 year old cars that were advanced for there time at a bear to maintain much less expect them to pull the duties of a daily driven vehicle. may be time to buy a taurus Altima Camry for daily use man😉
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  15. #15
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    the torque converter should click in twice while seating it I believe.
    MEMBER #2488 best rwhp 504 485 torque
    2016 shootout Best of show award
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