Drop in, no. The pinion angle needs to be set. This can only be done with the axle under the truck, and the weight of the truck on the axle. The perches are then welded in place to lock the pinion angle.
There are plenty of options available as far as axles go. If you want to spend money for a new axle look at
www.9inchfloater.com. They can make you a full floating 9 inch axle with any lug pattern, width, and tube size you desire. All for a relatively reasonable price. I have one of these axles under my 59 1/2 ton.
