A) Novak is wrong sometimes, a 30-40LE is a 21 spline AW4 a 30-43LE is a 23 spline
The model has NOTHING to do with 4x4 or not... if it has a tail shaft housing it is a (pretty rare) 2WD AW4 if it doesn't have a tail shaft housing it obviously mates to a transfercase.
Reason I found this...