christover1 wrote:If I go this way, do I need to use a rear or front diff, or don't it matter.
Doesn't matter AFAIK.
Is it just a matter of putting Vitara ring and pinion gears onto Sierra centre?
Or do we need the vit side gears for the spline on axles to match up?
Depends on whether your axles are 22 or 26 spline. (There's a changeover point from memory)If it's 22 spline grab a 4 pinion front sierra diff centre from a NT. If it's 26 spline use a Rear centre.
Do I still use the stock alloy axle housing piece on the Vit.
If you have to. If the pinion of the sierra diff is strapped down hard, and you don't smack the alloy housing on the ground, it should be OK. If you don't strap the pinion, expect it to break at some stage if you punch it in reverse. That's because it's trying to twist the back of the pinion up.
I will most likely be using an auto locker in the front,
Can't see a problem with that.
If I could use my rear lock rite up front, and spool the rear, that would be worth considerations.
I don't think I'd do that. Vitaras are quite a bit heavier (and more powerful) than sierras, they generate more traction, and their axles are no stronger. I've heard of quite a few vitaras with welded/spooled diffs breaking axles on the road.
Steve.