I have a 1999 Chevy Tracker that already has 4WD and 4WD air mesh. It's similar to the Toyota system: when you select four-wheel drive in the transfer case, the air system engages a clutch gear at the front that puts you in four-wheel drive. Convenient, but it means some things are constantly turning and potentially causing more wear. So some of us install manual hubs anyway. The other big advantage is that you can use low range in 2WD mode, which is handy for long descents on paved roads (using 4WD, especially in low range mode, is not a good idea on paved roads). They are very easy to install. Anyone who can change a tire and has a torque wrench can do it. And Warn tech support has been very helpful. I contacted others who told me I couldn't even do that. Sometimes you get what you pay for.
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