just picked up a 94 reg cab pickup 4wd 5 speed, mile marker locking hubs, 4wd lever will move into 2wd, 4hi, neutral, but doesn't want to stay into low. Light on dash doesn't come on, locking hubs seem not right, gonna take them off and put a set of Aisin hubs on that I have laying around. 4wd won't engage in 4hi or low, any ideas in why other than hubs? Thanks in advance