ok. Just bought a totalled silverado SS. Gonna put the motor and driveline in my 07 sierra 1500 SLT. Gonna sc eventually but thats a convo for another day and a different website. Anywho the factory 5.3 will be coming out. Is this physically the same motor as the GXP or will i need to modify? I think it should b the same but does anyone know for sure. Im thinking if anything I might need a different flywheel to mate to the 4t65 but i honestly have no idea. Just hoping i dont have to shorten crankshafts and crap like that.
