I have an 04 crew cab and I am swaping the ol 4.3 out with a small block 350. I am a mechanic in training so I'm fine with all the engine stuff but Imy not to familiar with all of transmission and the electronics for it. If I switch to a 350, will my electronic transfer case still engage and will my tranny shift? Does the 4l60e have a tcu? and if so will I have to add any sensors to the bblock for it? Any help or opinion would be nice! Thanks!