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Thread: 4r70w problems

  1. #1

    Default 4r70w problems

    First of all I know this isn't a mustang but I was hoping that I could find some answers for my problem here. I have a 95 f150 with a 4r70w that I've been having some problems with. When it first started it would stall the motor when I came to a stop, a lot like a manual trans would do if I didn't push in the clutch. Now it will kick into neutral and slam back into drive at random times. It doesn't matter if I'm driving down the highway or leaving from a stop. What could be causing this? Is it the trans or possibly something else? The trans doesn't slip and I've never had any problems with it until now so if it's just a part that has gone bad that is reasonably easy to replace I would prefer to do that than get a questionable junk yard trans. Any help would be appreciated.

  2. #2

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    there is a guy that is on mercurymarauder.net & crownvic.net that is a guru of these trannys. gose by screen name 88grabdmarq . heres link to a project of his which should lead you to wat to ask a question. If it need rebuilt this is the guy . I rebuild AOD/AODE/4R70W/4R75E Transmissions, check out my Facebook page for
    my latest project;
    https://www.facebook.com/pages/North...48414635312478 for what its worth

  3. #3

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    Quote Originally Posted by Alpine85 View Post
    First of all I know this isn't a mustang but I was hoping that I could find some answers for my problem here. I have a 95 f150 with a 4r70w that I've been having some problems with. When it first started it would stall the motor when I came to a stop, a lot like a manual trans would do if I didn't push in the clutch. Now it will kick into neutral and slam back into drive at random times. It doesn't matter if I'm driving down the highway or leaving from a stop. What could be causing this? Is it the trans or possibly , else? The trans doesn't slip and I've never had any problems with it until now so if it's just a part that has gone bad that is reasonably easy to replace I would prefer to do that than get a questionable junk yard trans. Any help would be appreciated.
    Weird. I only see the word "motor" in your original post, but it looks like the whole post is in this quote. Anyone else have this going on?

    Jess
    Currently own;
    1979 Mustang, v6 swapped to EFI 393, custom installed m122 blower, 4r70w trans, Megasquirt II, T-top swaped in.
    Previously owned;
    1990 Mustang, 545 BBF, C-4 with brake, ladder bars.
    1983 Mustang, 1984 SVO Mustang
    1984 Mustang convertible, v6 swapped to 351
    1986 Mustang GT, 1989 Mustang GT convertible
    1992 Mustang coupe, 4 swapped to 302

  4. #4
    FEP Super Member
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    Default

    When you post , please don't use dark color for the text of your post .

    It makes it very difficult to read .
    clowns to the left of me , Jokers to the right

  5. #5
    FEP Supporter 82GTforME's Avatar
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    Not sure it's relevant but years ago we had a Chev Calvalier auto that would stall out when coming to a stop. Turned out to be a soleniod for the OD malfunctioned and would not disengage IIRC.
    Quote Originally Posted by Travis T View Post
    I think this is my favorite car on the site right now.
    Quote Originally Posted by BLUECRAPI
    This is the best thread on the internet.
    Darran
    1982-1C (Black) T-Top GT RestoMod:http://vb.foureyedpride.com/showthre...he-Road-Thread
    1986-9L (Oxford White) SVO: http://vb.foureyedpride.com/showthre...d-did-1986-SVO
    1979 (85:Tangerine) Coupe (my son's): http://vb.foureyedpride.com/showthre...gerine-Machine
    1979 (3F:Light Medium Blue) Coupe (one day to be my other son's!) http://vb.foureyedpride.com/showthre...other-79-Coupe!

  6. #6
    FEP Supporter 82GTforME's Avatar
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    Not sure it's relevant but years ago we had a Chev Calvalier auto that would stall out when coming to a stop. Turned out to be a soleniod for the OD malfunctioned and would not disengage IIRC.
    Quote Originally Posted by Travis T View Post
    I think this is my favorite car on the site right now.
    Quote Originally Posted by BLUECRAPI
    This is the best thread on the internet.
    Darran
    1982-1C (Black) T-Top GT RestoMod:http://vb.foureyedpride.com/showthre...he-Road-Thread
    1986-9L (Oxford White) SVO: http://vb.foureyedpride.com/showthre...d-did-1986-SVO
    1979 (85:Tangerine) Coupe (my son's): http://vb.foureyedpride.com/showthre...gerine-Machine
    1979 (3F:Light Medium Blue) Coupe (one day to be my other son's!) http://vb.foureyedpride.com/showthre...other-79-Coupe!

  7. #7

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    Quote Originally Posted by ashley roachclip View Post
    When you post , please don't use dark color for the text of your post .

    It makes it very difficult to read .
    I didn't change the color. On my desk top the background is black with a light text but on my phone the background is light with black text. I posted this off of my phone which has the light background with black text. I'm assuming that's is what happened. Either way I apologize.

  8. #8

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    Quote Originally Posted by Alpine85 View Post
    I didn't change the color. On my desk top the background is black with a light text but on my phone the background is light with black text. I posted this off of my phone which has the light background with black text. I'm assuming that's is what happened. Either way I apologize.
    That's strange. Never came accost this before.

    Jess
    Currently own;
    1979 Mustang, v6 swapped to EFI 393, custom installed m122 blower, 4r70w trans, Megasquirt II, T-top swaped in.
    Previously owned;
    1990 Mustang, 545 BBF, C-4 with brake, ladder bars.
    1983 Mustang, 1984 SVO Mustang
    1984 Mustang convertible, v6 swapped to 351
    1986 Mustang GT, 1989 Mustang GT convertible
    1992 Mustang coupe, 4 swapped to 302

  9. #9
    FEP Member Mgino757's Avatar
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    Sounds like torque converter clutch solenoid failure. There's a clutch inside of your torque converter that locks up when cruising and after 3rd and 4th gear shift above 40 ish MPH with the stock computer tune. When the TCC solenoid begins to fail, it'll sometimes keep the clutch engaged when coming to a stop. the neutraling out and slamming back into gear when moving could be signs of a failing one way roller clutch or low fluid (which sounds unlikely). If the torque converter is coming apart internally, it could also stay locked. Next time it stays locked when coming to a stop, try shifting it into manual 1st. In this position, the valve body will not allow the torque converter to lock hydraulically. If the torque converter stays locked anyways, it is broke. If the torque converter has failed, there could be debris that has been pumped into other parts of the transmission, causing it to neutral out.

    I assume that you have verified that the transmission fluid is up to the proper level? When is the last time the fluid has been changed? How much mileage on the transmission?
    1985 Mustang GT conv. modified 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 3.55:1 8.8'' rear end, 180* thermostat, Ford Racing 10.5" clutch. Garage dweller.

    1998 Mustang GT auto. Stock and slow daily driver.

    1996 Thunderbird LX 4.6L V8. Wrecked, drag racing in heaven. RIP Oct 1995-March 24, 2016.

  10. #10
    FEP Power Member slow84lx's Avatar
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    I'm late to the party here but if you are still having this issue with the 4R70W I would replace the MLPS. Common failure on these transmissions & will cause the neutral symptoms. Relatively cheap compared to a rebuild.

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