bottle junkie
+1y
I actually checked on a different column. My dually is a 88. I have a 88 3/4 burban as well and the engine and front clip is off. So I pulled the shaft out between the column and gearbox so I could cut out the DD part of that shaft to use. I would assume that since they are both the same year, tilt, cruise, ect., that they would be the same column. I will put the dually shaft apart and check.
The shaft on the 3/4 ton burban is a rectangle with the tips of the corners rounded off some. Cross measured from corner to corner is 1 inch. I can take a small amount of material off of each corner to get the joint onto the shaft then tighten the set screw and jamb nut against one of the flat sides to hold it. If the dually shaft is the same as the burban I will snap a pic of it.