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my 99 cummins has a 47re auto i bought it from a guy who put a 2000 model motor in it and parked it. it sat for nearly 2 years when i got it i changed the trans fluid and filter but it still wont shift into overdrive any ideas on what could be causin it?
 

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The 99 internal tranny electrical components and 00 electronics are not compitable. Have no ideal how much the wiring is different. Was the 99 ECM,PCM, and wiring retained?
 
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