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1 st and 2nd and reverse will work manually bit it will act like neutral in drive range ?
let me know
if that is true and the converter is new then what is wrong is the forward sprag / one-way clutch has failed or is failing and causing this issue
that transmission will need to come out and apart to replace the sprag one-way clutch i am sorry to say
nothing else will cause this problem you are having i am sorry to say
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