Doesn't the front axle go through the oil pan on trailblazers? Or is that just on the I6? Either way, unless it is RWD only, one more thing to think about. Might need a rear-ended TBSS AWD to complete a swap.

 

The V8s have the oil pan where the front suspension goes threw it as well. I dont think its the actual axle, I think its the rack that goes threw the oil pan?
The 4.2s and 5.3s have the 4l60e and the LS2 has the 4l70e behind it.