2007 is a change over year. There are 2007 Classic and 2007 New body trucks. All the new body trucks had a Generation IV engine, and the Classic and prior were all Generation III engines. Major changes took place in the electronics that control the engine & transmission. 2007 Classic and prior had a PCM, or Powertrain Control Module. 2007 New body, have a ECM and a TCM. (Engine Control Module and Transmission Control Module.) One computer controls engine, the other the transmission. In vehicles equipped with a 6 speed automatic, the TCM is located inside the transmission its self.
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