IMO, al CVD cups and DEX410 pins and barrels are a must have. The NT1 pins don't have the flat spot and probably cost 5 times as much as the Durango parts.
My gears haven't given me any problems.
Set the slipper ALL THE WAY loose, then make adjustments in till it drives right. Setting to the manual is too tight IMO. My car would wheelie on turf with the 6.5 and the factory setting.