For independent suspensions the knuckle/spindle is de-linked from the control arms or strut (at the ball joints), and a (dummy) 'spindle bending part' attached instead. The knuckle is then attached to the spindle bending part at Pt. 9 in the figure below through a spherical joint and a gforce nonlinear spline bushing (Type 4).

All spindle markers remain on the spindle to react the forces on the compliant (knuckle) part. All necessary attachment points are transferred from the spindle to the spindle bending part.

Hub compliance is located inboard along the spindle axis at a user-specified distance. This distance offset appears in the construction option dialog box. From this distance, an additional hardpoint, 9h, is computed by Adams/Chassis during model preprocessing.

For option 2, a carrot part connects to a wheel with a revolute joint and connects to a spindle with a ball joint and a bushing. A spindle connects to a spindle top part with either a rev joint or a ball joint.  If Neck lateral is not 0.0 and Neck longitudinal is 0.0, there will be a revolute joint between a spindle and a spindle top. If Neck lateral is not 0.0 and Neck longitudinal is also not 0.0, it will create a spherical joint between a spindle and a spindle top. A spindle top connects to an upper control arm.

Option 3 is very similar to option 2. The difference is that a carrot part connects to the spindle part by a fixed joint.