Yes muggy diffs are a drop in to the lst2 cases, Sportwerks are as well; and you can use Mayhem ST TiNi gears for bulletproof muggy ratio. Running that in my muggy.
I just saw a mayhem 45t ring gear, will that fit in the lst diff case? Also with the pinion, does it need to be matched with the ring gear or can I just swap the pinion 11 to 12 to 13?