For your 4" of suspension lift, a 1" MML is not going to be enough by itself to replace the t-case drop. They have similar effects on the drivetrain angles but not in equal amounts. The two do compiment each other however.
The better and correct way to solve the drivetrain issues caused by such a tall lift is to get rid of the t-case drop and install a SYE kit and longer CV driveshaft. Not to mention the OE non-CV driveshaft becomes too short once you get to 4" of suspension lift height which means there are some offroad situations that could pull the front of the OE driveshaft right off the t-case output shaft's slip joint. Or, worse
than coming off entirely, it could only partially pull off but instead cock and jam when it tries to slide back down which has been known to bend the t-case output shaft.