These models of Dodge Ram have two different steering linkage designs. This package deal will only fit the 1st Design Steering Linkage: with a tapered hole in the drag link for steering damper mounting. So be sure to check under your Dodge to verify you have the correct steering linkage for this package.
This model will not fit models with the 2nd steering design. These models use a bolt on bracket for mounting the steering damper:
Inside or Outside Lock Ring?
The lock ring is important because it keeps the U-joint in place and keeps it from moving. If you have the wrong lock ring then the U-joint could rock back and forth and cause damage to the the yoke. If you have the outside lock ring it will have a circular shape with tangs and be at the top. If you have the inside lock ring then it'll look like a C and be at the bottom.
Rear Shaft Joint Count
On these models there are either 2 or 3 joints on the rear shaft. You can find these joints simply by crawling under your truck and looking at your rear shaft. However, if you don't want to do that you can also call Dodge and they'll tell you as well.