Power steering pump question

[chevy354]

Hi I have a 1977 chevy silverado k2500 with 40x 16.5 ground hawgs on it. The power steering pump whines like crazy and I'm guessing is a stock pump. Does anybody know of a good aftermarket pump that will support that big of tire without making any noise and where can I get one? Thanks for any info

 

[Black02Silverado]

Have you tried changing out all the fluid? Give it a good flush out, it is amazing how much crud builds up in the power steering system.

 

[chevy354]

No I haven't yet I was just gonna buy a bigger pump but maybe I'll try that first