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Im having a problem with my 4l60e transmission. In drive it starts in 2nd gear and only shifts up to 3rd. I can gain 1st gear manually but not 2nd manually. When the transmission shifts to overdrive it is intermittent. I've changed the 1-2 Shift, 2-3 Shift, the pmw, and the 3-2 downshift solenoids with no change. Ruled out the ignition switch by jumping power from the first ignition wire to the transmission wire with no change. Need advise before i throw more money into it


   
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Location: Oregon
I am not a transmission expert but I would scan the trans module and see if there are any codes before I did anything else. Then go from there


   
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