I was wondering if someone may be able to let me know if it is possible to change to oil pump in a 2001 silverado 2500 4x4? I have a 01 with 366,000 miles, the oil pressure tends to be fine then drops off then comes back up. The sending unit is fine, so ive been advised that a new oil pump in in order.

Any help would be apreciated very much.

Thanks, Steve