4l60e in to lj

Hi guys

i tried looking but couldnt find a answer.

Has anyone put a v8 4l60e in to a lj. Does it need tunnel mods i know i will need a new crossmember and probably need to shorten the tailshaft. What else would nee to be done?

I currently have a t350 in it but want a extra gear for high use. In putting in a efi 5 liter and the computer can control the box.

Thanks