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Question
06 yuon 4x4 will not shift into 3rd or 4th gear could it be a sensor
I suppose it could be, but I don't know which one. If you are not getting any codes (check engine light) then the only likely culprit is the ECM. I am assuming that there is not a fluid leak, of course. You are going to have to get a tech to scan the ECM and look for the problem.
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Mike Evans
Expertise
Auto repair and parts questions on any year or make including older and foreign makes(MG and DeSoto, for example)
Experience
30 years as an auto parts counterman and parts manager, both wholesale and retail
Education/Credentials
B.A. in english, minor in physics
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