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If that is the problem with the valve body, the sonnax part will fix it, in fact it will be better than new, as sonnax did some tweaking to this valve. Its usually safer to get the valve body replaced, because you could have another problem on the valve body. this is what currently I am facing. I used the Sonnax part, and it fixed the TCC lock-up, its working flawlessly...but my 1-2 shift is still not up to my expectations, so now tomorrow I am in the process of opening up the tranny again and replacing the 1-2 accumlator. I did it myself(I purchased the reamer tool needed). You mentioned your getting p1870, so your most likely to get it right with only the regulator. Good luck!
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