518 vs 45RFE

What exactly are you asking? I see 518 vs. 45rfe in your title but nothing in the post. If your thinking about using a 45rfe in an A-body it'll be alot more work. It's a progressive shift transmission that requires a computer to make work. That's one negative but it can be overcome. I've read it's not capable of the torque handling a 518 is either. Another big negative.