How hard is this? '95 4runner with autolocking hub - got the six bolts off put it was hitting something that was keeping it from coming off. Does 4wd need to be engaged? We tried that and it didn't work - it was up on jackstands, does it need to be on the ground? We're trying to tighten the wheel bearings, and probably do a bearing repack - is this any/much harder than on a Cruiser axle? Thanks.