just lockup both diffs in your montero and lifting a tire won't matter.

Holy unsprung weight Batman!!!

I dont know about the factory ifs unit working because of the offset center. If I use jeep or toyota axles I will reinforce the housing any way and by the time you do that there wouldn't be too much of a difference in weight, I wouldn't think. Plus you would raise the pumkin up 4 inches or more. And if done right big if maybe 4 wheel steering.

Have you done anything to see how well these things work? Check out youtube. Raider. Pajero. Montero. I have been wheeling these since 2008. I feel like a newbie compared to some of the guys on here, but I have wheeled mine hard enough that the biggest local jeep club let me become a member. I am the only non-jeep in the club, and it has some 250+ members. You are trying to do this cheap, but any SAS you do is not going to be cheap. Even if all the labor is free. Jeep axles, Toyota axles, They won't be geared properly to go with everything. Stock in these is 4.62 man. it sounds like you have access to a welder.Get some manual hubs. If you can't find any at your local junkyard, order them from a guy here on the board, his name is plh. He gets them BRAND NEW from over in the Far East during his business trips. After you get those. weld up that front differential. That is going to makea huge difference in your wheeling abilities. Do you know for sure that it DOES NOT have the LSD (limited-slip)differential in it? Is there a faded orange sticker in the drivers door opening anywhere? Have you changed the fluids in the axles/differentials? If so, if it a LSD rear axle, you have removed all the stuff in the differential that makes the LSD work. Forgeta bout all that flex talk that goes on among jeepers.

climbing rocks, 35's,l ocked front and rear

Have fun fitting that beast under the front and clearing the oil pan and you would have to switch your transfer case to one that is center drop. Reminds me of the humtero or whatever it was called where a guy put the hummer axles on a raider. I like it but tough to fit it in. I had 2/3 of a mitsubishi SR front axle done before heading to school. Now it is sitting in a trailer waiting to be finished up. This would be your nice of best world if it could be finished.