GM-GMC: 4L60E question, 4l60e transmissions, gmc sierra

Question
What year and make 4L60E transmissions will fit in my 99 Gmc Sierra?

Answer
The best place to get an answer to that question is an auto recycler.  They have books that specifically cross reference what parts fit what vehicles.  I would guess that any tranny from an s-10, blazer, jimmy, astro, c1500, k1500, trailblazer, rainier, etc etc from 1998 and up would fit.  To be sure though, make a quick call and ask.
Hope this helps.