I ran my rig welded for 12yrs on and offroad with 35" to 37"s tires and welded it similar to how you did yours without breaking it. You'll be fine and if it does break, a spool or locker will replace all of it anyways.
If you welded the 4:10's you'll probably be underpowered in hi range with 40s, but with an ultimate tcase set up you'll have a lot of gearing options.
The goofy leaf set up does work pretty good as mentioned. When climbing up vertical sections you might suffer from this set up though. You might want a track bar to help with axle wrap this will cause.
