There are all kinds of ways to hook up the column to the box. Using the old stuff or new hardware. As one example: After removing everything off the end of the column, you end up with a spline on the shaft sticking out the bottom of column. After taking off the rag joint, you end up with another splined shaft. Ujoints are sold in many combinations. For example, Spline diameter/spline count on one half and a "double D" hole on the other half of one joint. The Double D means a round shaft with flats 180 apart. The double D shafting is available also. One Ujoint on the end of the column shaft and one on eth end of the box shaft. Measure, cut and install the Double D shaft. Done.
Your exact situation may differ. You may choose to use some shafting or joints you have. Some column shafts have an inner and outer section so as to collapse in a collision. this is good. Using the example above with two Ujoints also provides safety against shaft coming at the driver during collision. The joints deflect shaft so that it's not a straight shot.
See
this for technical info and parts. Read every word.
