Really can't see the point of fitting uprated coil springs, if anything I want softer ones off road, the front is horrendously hard even with the anti roll bar removed. A torsion spring is fine as someones said it's common practice on Peugouts etc to lower then on the splines quite radically at times too but I've also seen road rally pugs lifted that way without any problems.
Biggest problem with the twin wishbone set up is the limited travel. If I lift it much more I'll loose all my droop but will gain more bump travel which is where I could get trouble with the torsion bars being over stressed. Larger bump stops would cure that though as would removing the bottom bump stops. However I would then come unstuck in that the driveshafts CVs might end up operating beyond the extremes of there range - one knackerd CV joint. I've had a look and it would be possible to lower the front diff to avoid this, but this would involve lowering the two crossmembers which would be counter productive as they are already just about the lowest point at the front of the truck.
I really can't see a Patrol axle under a Maverick unless it had massive arch extensions etc and I certainly wouldn't be mounting it on cart springs if I did, lift can be achived on any live axle system easily enough.
Now what I really need for the front end is a set of portal hubs off a Humvee, they run independent all round with portal style hubs, thats the real solution, however back in the real world as they are somewhat pricey and would be major re-engineering to fit - I've looked at it.
To get some more height I need bigger rubber. I've only got 30s on at the moment and a few people are running 31s, now with my 60mm body lift I've got over 2 inches more clearance in the arches, which means 35s might be a possibility, I need to borrow a set to try them, don't mind trimming the arches get them in.
But that would put the gearing up 20%. As I've got a petrol, I've already got the lower of the diff ratios so thats not an option and I don't know of any other ways of lowering the gearing thats available for these trucks - but anyway a new clutch would be first as this ones getting tired and you never know it might cope on standard gearing.