It'll feel like a someone shov'd a red hawt pok'r up yer kiester, I reckon'! be walkin' funneh fer a week!
Joking aside, you'll notice a reduction in acceleration (due to lower gearing), a more jerky/torquey feeling when using the throttle (again due to gearing). You'll also notice the vehicle making probably a little more gear noise and being slower. It might stiffen up the steering slightly, its not as noticable as domestic vehicles. But you'll feel like you're crawling along more than you do in 4Hi.