4R70W OD light flash...1-2 shift error
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4R70W OD light flash...1-2 shift error
I have 97 4.6 4x4 with the 4R70W and the OD light started to flash over the weekend. I have recently purchased the truck and the previous owner said a local shop re-did the tranny ~10k miles ago. (currently truck as 122k) I took it to local Ford dealer and they said it was 1-2 shift code. (they didn't tell me the exact code.:-(. The recommend a 1-2 shift accumulator. Any thoughts from the experts? I replaced the TCC right after I bought the truck to solve a TC shudder with the help of those in the know here...asking for assistance once again. Is the 1-2 accumulator common and is it something I can do on my back in my driveway. (I have reasonable mechanical aptitude)
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From: In my House
I did the 1-2 accumulator spring on my 96 right in my driveway. Your probably having a hard 1-2 upshift, that would mean the accumulator spring is broken. Get yourself a good pair of straight snap ring pliers. Ones with a 90 bend on them don't go deep enough i foound. Make sure you have a photo of what your looking at beforehand. 
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I took 1-2 accumulator apart tonight, everything looked pretty OK...no broken springs etc. I have the updated piston assembly ordered from Ford Dealership and they will be here tomorrow. The accumulator was old style (aluminum w/ o-rings) and I was able to remove it without removing VB, I am hoping I can re-install it with leaving VB in place. Other than polish the bore slightly with scotchbrite is there any tricks?
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From: duncan oklahoma
sounds like you are right on track,the only thing that comes to mide is did you find any big pieces of metal in the pan.i was thinking that a intermidiate one way clutch could cause a no second gear also
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Update: I replaced the 1-2 piston and springs with the updates version. (had older aluminum style). Polished the two bores with some scotch-bright and re-installed...drove couple miles 1-2 shift felt good...2-1 downshift felt good...I am starting to be pleased then bam..OD light back flashing. The the shifting is odd (I assume it goes in a "limp home mode". I didn't replace the cap and/or cap o-ring and I thought maybe that was dumb since I had it all apart. Also I had some difficulty getting the cap past the preload and install snap ring but I eventually got it. I was afraid I harmed the cap o-ring once but removed it (before I had snap ring in) and the o-ring looked OK. I dunno what else to try.......thoughts from the experts? FYI oil was clean, no trash anywhere and smelled fine.
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From: duncan oklahoma
Originally Posted by mneal
Update: I replaced the 1-2 piston and springs with the updates version. (had older aluminum style). Polished the two bores with some scotch-bright and re-installed...drove couple miles 1-2 shift felt good...2-1 downshift felt good...I am starting to be pleased then bam..OD light back flashing. The the shifting is odd (I assume it goes in a "limp home mode". I didn't replace the cap and/or cap o-ring and I thought maybe that was dumb since I had it all apart. Also I had some difficulty getting the cap past the preload and install snap ring but I eventually got it. I was afraid I harmed the cap o-ring once but removed it (before I had snap ring in) and the o-ring looked OK. I dunno what else to try.......thoughts from the experts? FYI oil was clean, no trash anywhere and smelled fine.
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Yeah, I ordered the solenoid pack (it was 40 dollars) and the updated 1-2 accum. cover from my local dealer. It come into tomorrow and I will that this weekend.....after that...I am at a total loss.
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