Ok ive got a few questions. Im looking to get rid of my dog of a v6, looking for something with a little more pep. I had a buddy with a 03 Silverado with the 4.8 and 5spd. I loved the sound of a manual v8 but it wasnt entirely enough power. Did i little searching and found the 2500's had a 6 liter and 5spd option but is that the same transmission thats in my truck? Id like to drop in a 5.3, but again, i dont know if it would mate up and if my transmission will handle it. Any help would be appreciated.