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Thread: Transmission Issue. Delayed Drive Engagement and Intermittent hard upshift to 2nd

  1. #1
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    Transmission Issue. Delayed Drive Engagement and Intermittent hard upshift to 2nd

    Transmission guru needed fellas please and thank you. In have a 4R75W with a 2 to 3 second delayed engagement to drive from park or reverse. No slipping, seems to shift fine initially. After driving for about 20 minutes of you come around a bend coasting down at about 20mph it hesitates and then kind of bangs into gear, like it's searching for a gear light throttle only. It's not violent but noticeable. The transmission has 140K not sure if was serviced before, pan has never been down. The fluid is full and it's not burnt but a little dark. I dropped the pan yesterday it was very clean, no debris or clutch dust. I changed the filter and put 5 quarts of fluid in it. I probably should have checked all the valve body bolts but didn't have time. It still has the delayed engagement and the hesitation has become more frequent. I haven't had a lot of time to research but I read valve body issue, dried up or damaged seals, or a forward clutch issue. I was just hoping someone has run into the same thing. The car is not modified it is completely stock. Any suggestions or thoughts would be helpful. Thank you.

    More info the car drove fine for a few days with OD off but still had delayed drive engagement. It has now started slipping into drive we parked the car. I was going to drop the valve body and check for a cracked separator plate or check balls that are stuck or worn. I wouldn't think I would need to replace the entire valve body........... Any help would be great thanks.
    Neil
    2003 Mercury Marauder - DBP/DC
    #195, Eaton Swap Car, New Bullet ITW
    2003 Mercury Marauder - BLK/DC
    #2821 of 7838, Tagalong 2 - Wife's Daily Driver
    2004 Mercury Marauder - DTR/LF
    #963, 310K Miles, Junkyard Engine, Daily Driver
    1964 Mercury Marauder - BLK/BLK
    390FE, 4D HT, Staggered 18's, Cruiser
    1986 Buick Regal Grand National
    Stock Block/Heads 11.08 @ 122.39mph, 25psi

  2. #2
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    What fluid type did you use? Merc V?
    Have you verified the fluid level? Trans has to be hot (after an interstate run) and idling to check correct level.

    screwy upshifts could be a broken accumulator spring which although its not too uncommon it is unlikely.

    Im led to believe that both of your trans issues are related which I would think is a pressure issue. If you can verify hotter than normal trans temps that would lead me to believe the torque converter is at fault.

    btw, if you have a trans thats been neglected and hasnt been serviced in 100k miles you shouldnt have changed the fluid as that usually causes them to fail.
    If you have to top off a high miler I only recommend adding a bottle of lucas trans fix.

    If it were me I'd toss a new converter with a bottle of additive along with fresh fluid and the lucas and hope for the best.

    Unfortunately, Ia havent come across many vb issues.
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  3. #3
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    Correct fluid, correct level, etc. I am aware of correct service intervals. Once the trans engages into drive after the delay and slip then bangs to engage with overdrive off it performs flawlessly. That is until you have a light throttle condition where you are coasting down to around 20mph and step on the gas as stated above. I am struggling to understand why you would say torque converter or a broken accumulator spring. My symptoms have little or nothing to do with those components IMO. I appreciate the reply.
    Neil
    2003 Mercury Marauder - DBP/DC
    #195, Eaton Swap Car, New Bullet ITW
    2003 Mercury Marauder - BLK/DC
    #2821 of 7838, Tagalong 2 - Wife's Daily Driver
    2004 Mercury Marauder - DTR/LF
    #963, 310K Miles, Junkyard Engine, Daily Driver
    1964 Mercury Marauder - BLK/BLK
    390FE, 4D HT, Staggered 18's, Cruiser
    1986 Buick Regal Grand National
    Stock Block/Heads 11.08 @ 122.39mph, 25psi

  4. #4
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    Where are the trans guys at?
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  5. #5
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    Not really what i was trying to say.. Where are the transmission experts lol... I too say internal fluid leak. Put a pressure gauge on it bud.
    The twins2.3 whipple/aluminatorVortech V-2 lots of goodies

    04 DTR totaled, might make into a station wagon Here is how bad it was https://youtu.be/REUxjP1BVpg

    04 Whipple SILVER BIRCH
    03 Silver Birch Light Flint <--- Cannot kill it.
    03 C.V. Sport SILVER FROST daily beater
    04 Heaton Swapped DTR
    Joe's Wrecked DTR rebuild thread

  6. #6
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    I was able to pull codes. Its got a transmission code for the output shaft circuit and a throttle actuator code. Btw this is an 05 CV Sport. I wonder how much input the electronic throttle body controls or talks to the transmissio? Hmmmm. Trans experts please step in. Not other trans types ��
    Neil
    2003 Mercury Marauder - DBP/DC
    #195, Eaton Swap Car, New Bullet ITW
    2003 Mercury Marauder - BLK/DC
    #2821 of 7838, Tagalong 2 - Wife's Daily Driver
    2004 Mercury Marauder - DTR/LF
    #963, 310K Miles, Junkyard Engine, Daily Driver
    1964 Mercury Marauder - BLK/BLK
    390FE, 4D HT, Staggered 18's, Cruiser
    1986 Buick Regal Grand National
    Stock Block/Heads 11.08 @ 122.39mph, 25psi

  7. #7
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    if you have codes you need to fix that first before you can do any diagnostics

    the oss is used to shift, if its not working correctly your shifts will be screwed up

    throttle position is used for shift scheduling and tv pressure. If its not working correctly your trans shifting will be screwed up.
    '03 Marauder 300A - 87 Octane Race Tune
    O&E Speed Shop - 2333 Aberdeen St. Kenner, LA
    EFI Calibrator - decipha @ EFIDynoTuning
    http://www.efidynotuning.com/tune.htm

  8. #8
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    When I was younger, richer, and dumb... I bought a J modded valvebody for my Marauder's 4R70W.
    Now that I'm older, poorer and still dumb...
    I still have the very low mile OEM valvebody that I pulled out of the transmission.
    What's something like that worth?

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  9. #9
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    Just to finalize this the forward clutch piston seal is probably toast. Even the smallest nick can cause a pressure leak. This means the clutch will apply, but may leak pressure slowly and cause the clutch to burn. The forward clutch is applied once you put the gear selector in Drive and it stays applied in 1st, 2nd and 3rd gear, so it has to keep fluid pressure otherwise it starts to slip. The separator plate cracked where the 2-3 servo cover pushes on the plate. This causes Forward clutch pressure to bleed over to the direct clutch passage. I replace the separator plate with the Superior Tuff plate part # K092 and it made no difference. Rebuild time.
    Neil
    2003 Mercury Marauder - DBP/DC
    #195, Eaton Swap Car, New Bullet ITW
    2003 Mercury Marauder - BLK/DC
    #2821 of 7838, Tagalong 2 - Wife's Daily Driver
    2004 Mercury Marauder - DTR/LF
    #963, 310K Miles, Junkyard Engine, Daily Driver
    1964 Mercury Marauder - BLK/BLK
    390FE, 4D HT, Staggered 18's, Cruiser
    1986 Buick Regal Grand National
    Stock Block/Heads 11.08 @ 122.39mph, 25psi

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