Greetings, I have a 2000 Chevy Silverado stock 2wd with about 20k miles on it, and I'm curious about one particular thing that I've heard is possible. Now before I continue I am not interested in anyone saying its not worth it, just buy a new truck. I am a rather high rank in the military, and cost is not an issue, but like most in today's economy I would like to find the biggest bang for my buck. The truck is the last possession that my father left me before he passed away and it has great sentimental value. I already have another truck, and so I'm just curious as to what I would have to get, or rebuild, to be able to convert this truck to 4wd. I've heard stories from all over the place saying you don't need a new trans; that you just need to modify it, and people saying you do need a new one - which is it? This is just a fact finding mission so please throw your mechanical knowledge out there and let me know. Any and all assistance would be appreciated. Also, Please forgive me if this has already been discussed or I am in the wrong section. Thank you.