Frankly I don't know. I bought it off of eBay.
On this page:
http://www.gmpartsdirect.com/oe-gm/12588923
it shows a bunch of vehicles that this fits and they are all 5.3 and 6.0. Perhaps someone on this forum could chime in and tell us if there is any difference in the TAC modules used on 4.8 vs. 5.3 vs. 6.0. I thought they were all the same.