If you are going to fit 4 to 4.5" lifts then drive shaft angles will become an interesting subject.
Transfer case lowering is not the answer for a stock driveshaft, the axle flange and the transfer box flange need to be about parallel or you will get changes in angular velocity as the driveshaft rotates, leading to shunting in the driveline and premature failure. This gets exponentially more serious the more the fklanges are out of parallel.
However as the angles the joints subtend increase you will find the joints wearing out due to the work they are doing and at much more than 12 degrees they may bind. At high angles they will start to vibrate quite quickly and then you will be replacing bits.
Every lift seems to be different but you are on the edge of needing a CV type driveshaft and hence needing to rotate the rear axle so the pinion points at the transfer box.
Before you get too far into it, read Tom Woods website on angles, get under there with an angle finder and measure what you currently have. Some simple geometry will tell you the effect of lifting it.
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