My Duster is under the knife....TKX going in

Power lock. Nice diff. Have one in my dart and an old Ford pickup. The one in the pickup was set up tight and will chirp the tires in a sharp turn with very little gas applied.
The power lock type diff is more aggressive than the cone type I believe. Also the most preferred.
Great news on the clutch and shifting. I went the close ratio too. I am running 3.55 with a power lock.