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my swap was tough because I wanted to stay 5 speed, but I had the transmission mounts and axles already at the good length and everything, but on the downside I had to get a flywheel made and balanced with the engine..
but your swap will be easier because of the fact that you stay with an automatic car and keep the 4t65hd tranny so the harness will be wayyy less job to do than mine (btw, I had no harness with my engine, I did mine from scratch using the 4cyl alero harness)... a couple of thing will need to be bypassed like the 2 speed fuel pump setup in the fusebox if you want to keep your stock fuel pump but all in all the wiring should be simple..
edit, I also tucked my harness and placed the pcm under the dash like stock, not underhood like the 3800
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