[Tom Goldman]

If you have the 11.5" American Axle with code DSA antispin differential, they can be very agressive on turns, similar to a locker. ...It's a multi gear helix type differential.........I dont think your truck would have the 10.5" American Axle,due to the cab and diesel .....That axle does have a clutch and plate type differential that is very finicky about having it's gear lube and factory posi additive at about 20 k mile intervals. ....................Tom