Use the flywheel AND the block adapter for the 04 truck. The 07 used a G56 6 spd and the 04 used a NV5600 trans. The clutch and PP also are different. My question is the 04 a 305 or 325 hp engine? You can only use the 07 engine if you have a 325 hp engine in your 04.

392 gen III hemi on E-85 727 trans Dana 60
10.02@134