Hey guys,
I have an 02 Tahoe LT 5.3L 2WD Flex Fuel. As I'm sure most here can relate I love my truck, so I want to keep it as long as I can. This means eventually I might need to replace or rebuild the engine and transmission.

So out of curiosity, what transmission and engine would you guys recommend putting in the truck if you had to replace it? or would you rebuild it.

A while back I came across a thread were someone said I could get an engine from GM for cheaper than than rebuilding a used one, especially if you do a full rebuild. Is that accurate?
Also, is it possible or worth replacing a 5.3L with a 6.0L?

FWIW, I don't need to do anything right now. I'm just trying to learn so come the day I do, I know what to get.

Thanks guys, much appreciated

R.