When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have problems with my auto hubs like a lot of people do. I know that several have capped off the vacuum lines and put in the manual hubs. My question is, why wouldn't you just keep the auto hubs, cap off the vacuum line, and just lock them in manually. I'm sure there is a reason that I'm not seeing, because I can't see why you would spend the money to change the hubs when you can just use the auto hubs as manual hubs.
You CAN do that, but the aftermarket hubs are usually much stouter than the factory units, or at least consider so. They also operate smoother, and IIRC WARN still holds at least a multi-year warranty on theirs, not sure about other manufacturers. I believe once you're out of the factory warranty, OEM hubs only carry 6 months to a year of warranty at best.
If a hub leaks vacuum its going to leak water too, water and dirt into the hub bearings is no bueno. Warn is multi year if not lifetime, Mile Marker is lifetime. I remember my first MM hubs and not engaging and thinking they broke like the vac hubs which literally blew apart the plastic inside and just free wheeled. MM guy was like a D60, SS449? BS, its stuck because you didn't lube it. He then sat on the phone and walked me thru disassembly, lube, and reassemble. Took under 10 minutes and when you get it apart, see the parts, you realize it would take an act of god to break that thing. When those engage you sure know it, they thunk SOLID into locked, you can feel it in the steering wheel.