Cool. In the big picture, you should consider yourself lucky. Swapping-in new leaf springs is an easy fix. Driving around like that could have been disastrous. Hopefully the t-case is okay. It looks like the whole axle shifted rearward, and fortunately...the H3 has an extremely long slip yoke on the rear driveshaft. So I can't see the spring issue having much effect but, driving around for 2-months in 4HI-Lock can't be good for it. The fact that you cycled the buttons on the dash and it switched modes tells me that its probably okay.
Driving around on drive pavement in a locked 4WD mode is a huge NO-NO (on any vehicle). Even in the 70s...owners manuals caution against this. The reason is that both 4HI-lock and 4LO-lock put a tremendous load on the drivetrain, and there is a lot of binding that occurs...especially when turning. The idea is that a slippery surface (mud or snow) compensates for the all that binding. You sort of need a slippery surface so the tires can slip and release some of the stress that builds up in a "locked" mode. The problem I see isn't so much the t-case...its all the other parts that have been put through the ringer for two months. Your front CV joints, driveshafts, steering rack, and differentials have all been seeing much more than normal stresses for the past two months. You may have doubled or even tripled the wear on your tires for this this period. Definitely check and rotate them when you get your truck back from the dealer.
Now that you've got it in 4HI-street mode...your drivetrain can finally "relax". You should immediately notice it will steer much better, and generally be smoother throughout your daily driving. Mileage should be better too. Time will tell if any of that stuff (including the t-case) got damaged.
