What parts do you ALWAYS replace in the pump?
Pump Bushing, Front Seal, Both Stator Support Bushings, Boost Valve assembly, Pressure Regulator Spring, Drill out the drain back circuit, Drill a Lube To Line Bypass.
*If the Pressure Regulator bore plug is loose.....Sonnax has a plug with a O-ring.
*The Pump Body, Pump Cover, & Pump Gears need inspection & culled if worn/damaged.
On a High Performance unit....I recommend replacing the pump gears with PTFE/Teflon coated gears from CK Performance.