Marcus, should be able to buy off the shelf items for the manual hubs, but I still cant understand why you would want to do this. It will mean that you will have to get out of your car to engage them instead of engaging your center diff on the fly. If your concern is the amount of fuel that you are using, then the cost of a new T-case and an adapter set to fit it up, plus the switching set up ( Electrically operated on the one you suggest) would cost a small fortune.. more than what you could expect to save on fuel and tyres. If your tyres are wearing badly then have your alignment checked both front and rear. I have found that this is the major cause of tyre wear as most people dont want to spent the few extra dollars for a front and rear alignment. If however, your tyres are chirping as you go around corners then your center diff is locking up for some reason when its should be unlocked. This would have to be investigated as you would be experiencing very severe axle wind up. To check this drive around the block on one direction only then park the car and jack up one wheel. If the wheel starts to spin ( a fair bit) as soon as it leaves the ground then you have axle wind up.

What your reading in the Forums about driving with the front hubs unlocked and the T-case locked being bad is definitely not true. It is better for the front propshaft to spin otherwise it just sits in one spot and bounces up and down causing premature wear in the shaft spline. Same goes for the crownwheel and pinion. This is one of the reasons that most 4wds are constant 4wd these days, as its much kinder on the drive line. What you want to do is certainly possible, but at what cost. I would expect that even if you could get an adapter kit to bolt up a different T-case you would be up for a couple of thousand $$, plus the cost of the freewheeling manual hubs and the electrical switching system to engage and disengage the T-case. Thats a lot of fuel.... especially when your only talking about the difference of a few cents per KM. not to mention that there is no guarantee that you will save any money at all.

Sorry mate, I know this is not what you wanted to hear, but I think I should be frank about it. Unless you have a specific reason to change over ( eg competition use) then I would strongly recommend that you dont. At least on a cost basis. IF however you still want to go ahead with it, then try speaking to a company called Marks Adapters and see what they think. They are the best in the business, and have done some awesome and wild conversions. Good luck, and keep the shinny side up.Cheers Mark