Fresh third member setup question

yes a properly rebuilt differential will have some resistance when turning ,, this is due to the preload on the pinion bearings as well as the preload on the carrier bearings ,, your gear pattern is perfect leave it alone ,, your backlash is on the low side but after you make a few runs it will open up a bit ( .002-.004 thou ) as the bearings run in ,,.pinion bearing preload should have been in the 20-25 in/lbs for new bearings but you should be ok ,,, just make sure you break in the differential properly as you can ruin the new bearings in a few minutes ,, i always include break in instructions with all the differentials i build and the shop you had build yours should have as well.