Dennis, I had a shop do the replacement at the time, as I was also getting a ball joint replaced and wanted a full 4 wheel alignment completed. The shop was good with corresponding with me (and I am a pretty hands on and nosey owner, going in the back of the shop etc.) to my knowledge nothing required a modification.
I should add that while getting the rack installed and a ball joint changed, with an alignment, I also had camber locks installed. The front end was in good shape then and everything was done at the same time.