can you change the oil pump with engine in car

I should have gave a little more info. It is a 5.7. The oil pressure has been checked with a gauge. At 1000 rpm, it flucuates between 15 to 40 psi. I was hoping to find some one who had tackled this job before. The engine has 232000 on it and does not use any oil between changes. Parts to do this run about 100.00. Plans are to replace the car for suv with more room. I think the engine will raise far enough to remove the pan with out taking tranny loose from engine but, not sure. That is why i was looking for some one who had done this.

Pump most likely ok! Sludge in oil pan intermittently blocking pickup screen! Google "flush oil pan". Then if that doesn't work, remove oil pan by jacking engine, may have to drop pump with pan!....That what you looking for??

thanks, will take a look.

Yeah!