Think through your fan replacement. I didn't break anything when I moved my trans cooler but went with two much lower profile 24v fans. A simple blanking plate over the core matrix with round holes sized for the fans got the job done in a package that was 5-6" shorter overall than the OEM unit:
I still haven't hooked up the power to them but they will blow down over the muffler. This version of the mount I made just uses muffler clamps to secure the vertical legs to the chassis crossmember. I am pretty sure this will be the final version but that may change once I get the subframe built.