Okay guys, here's the deal...I swapped in manual hubs in place of my autos. No problem, no kit was needed. But...I have an NP241 transfer case. I don't know whatkind of t-case you have, but if you have an NP203 (big cast iron hunk o' metal), you may need some sort of "part-time" conversion kit. I'm not positive on this, so someone else speak up please. What I do know is that if you have an NP241, 205, or 208, you won't need any conversion kit to replace your auto hubs with manuals.