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Q: what is making my transmission slip back into a lower gear after i get up to 45 on 2007 Dodge Ram 1500

when the transmission changes to higher gear and i'm above 2 rpm it slips back to lower gear and now the malfunction light is on.
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You need to have the PCM(computer) scanned to retrieve trouble codes. Could be a TPS(throttle position sensor) or other things. Won't know where to start without a trouble code.
The parts house will not be able to retrieve trans codes. You do not necessarily have to take it to the dealer. A qualified independant repair shop can diaginose this problem.
I would seek out a trans shop. You must know someone that has a recommendation for a trans shop.
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