How to know if my 2000 ford ranger has pulse vacuum hub locks?

My 2000 ford ranger 4x4 xlt. 4.0 engine, has been making a humming noise for some time now on the front driver's side hub. And I know what wheel it is. I looked for prices online but it gives me 2 options. With or without pulse vacuum hub locks. I'm handy, so I was wondering if anybody could tell what steps to take in order for me to physically find out, or the differences between both hubs. I've asked in many autoshops and they don't know. And some mechanics, but they want to charge me in order to find out.

Assuming your talking about the hub assembly for the 4wd, is it a electronic 4x4 selector or the lever on the floor?

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