Interesting....
Normally the Larger diameter control arm is on the bottom and the smaller diameter arm is on the top.
Your differential is angled out towards the front bumper at the top, where your interference is.
This is what it should look like...
The picture is of a 1500, but the control arms, track bar mount, etc, are the same parts
The differential should be perpendicular to the ground, or the top of your front diff should be kicked back slightly.
Please double check your measurements.
Perhaps a call to Tuff Country's tech line is in order. When properly installed, that differential should never be close to the track bar.
The solution isn't difficult, you're simply going to have to a bit of detective work!