got a 2005 LLY that is down and out. bought a 2003 LB7 truck with descent engine. and tranny. how hard would it be to install the LB7 in my LLY truck transmission and all. i have the complete donor truck so i have computers . i know everybody goes the oposite to what i want. but i can tell you ive owned 2 LLY trucks and both have been weak even with tuners and other mods