[74cj5360]

I have a 1974 Cj5 with Warn Premium Lockout Hubs.... Unfortunately I don't get out 4-wheeling as much as I would like, but the last time out I had an interesting thing happen. Had already locked in the hubs, then got into a mud hole.... shifted into 4 low and noticed neither front wheels spun, while the rear did. Shifted into 4 high and the front engaged, then shifted back into 4 low and they worked fine.... Does anyone have an idea where the problem may be coming from, or is it possibly a transfercase problem ??... Thanks !