2001 LB7 Duramax | GMC Sierra 3500 Crew Cab Long Bed Dually. Seals blowing out on the OEM steering gear box is a fact of life, especially for trucks that are or near 20 years old. Luckily you can pick up a remanufactured replacement machined to have tighter tolerances thus making them last longer. As an added bonus they are pretty cheap to replace and do not take a whole lot of time or special tools.

Pick yours up:
Cardone 277589 Remanufactured Power Steering Gear: https://amzn.to/3xboa1i
Puller Kit:
YSTOOL Front End Service Tool Set with Automotive Ball Joint Separator Tie Rod End Puller Pitman Arm Remover 5 PCS Removal Splitter Kit: https://amzn.to/3PVjDHH