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I am getting ready to change out engines in my 04 chevy trailblazer, 4.2 is it best to disconnect tranny or pull it out with engine

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If you can not easily reach the bolts on the top of the transmission, it's easier to take the engine and transmission out together. It will usually require you to add a tilting mechanism to the engine hoist because you'll have to probably tilt it at a pretty steep angle to get them both out, but that's an easy part to use.
If the bolts are easy to reach on top of the transmission, and you don't need to do any work on it, then unbolt it and remove only the engine.

Posted on Nov 22, 2014


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SOURCE: 2002 Chevy Trailblazer Engine Codes

This is actually an easy swap out. Remove the electrical connection, remove the retaining bolt and pull out old one. I believe the sensor is located in the front passenger side of the engine on this particular model.

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