I have aisins on the front hubs(off an 83 monty) on my 95 SR. They fit fine. Yes I have attempted to shift to active trac(4hi) when the hubs were unlocked(by mistake)...not a good Idea unless you like to hear horrible grinding sounds <img src="/forums/images/graemlins/shiner.gif" alt="" />. The cool thing about the active track system and manual hubs is that you can leave the hubs locked and simply shift in and out of 4wd at will and then when you feel like it, or your wheeling trip is over, You still have the option of unlocking them. I feel that manual hubs save the cv's and cv boots from wear when running cranked T bars as well as less rolling resistance in the front drivetrain when running in 2WD.