I have a 94, S110, tipper (scissors lift/dump), and have a question about the 4wd switch. There is a big round button on the middle of the dash, that when I push it in, seems to lock up the rear axle, in all gears, when in high range. There is a toggle switch, to the right of the steering wheel, that when in the on position, seems to lock up both axles, when in high range, but only in first, and reverse. If I move the selector behind the shifter into low range, both axles lock up, in all gears, putting me in what I’ve always callled 4-low lock. So, is this the way it is supposed to operate? And, has anyone modified the switches, so you can put it into 4-lock, in all gears in high range?