I have a 94 5.7 l two wheel drive 1500 truck and I need to replace the crank in the main bearings do I have to pull the motor out of a truck

 

Unless you wish to remove the grille, condenser and radiator, yes, you do. And in some states, perhaps the US (assuming you live here) you'll have to evap the refrigerant from the A/C to remove the condenser, legally.