That wont help in high range. This is definately one of the problems with lifting a sidekick and running toy diffs. The 5.29's only are fine with say around a 33 and less. But once you start going up in tire size that poor 1.6 can barely grab 4th.
The 2WD to sami t-case gives you overall gear reduction, and then with a gearset you can get even deeper high range. My range box gives me 18% more reduction in 2H, I was running 5.29's but couldnt get over 70km/h in 5th gear, now I run 4.10's in my diffs. Back to basically stock gearing on road, but nice and deep off road.