Ive been avoiding this project since last year. Might be the push I need to do it.
If your "on the fly" switch ion the cab doesnt lock your truck into 4wd, and you have a leak in the hubs, this will fix the issue. But I would check to make sure you dont have a bad vacuum pump, or you dont have cracked lines somewhere. Im 99% sure its my hubs that are fried.
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