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Early Bronco Knowledge Base Explore more early Bronco tech and history articles in the WILD HORSES Early Bronco Knowledge Base. Return to Base Stock Early Bronco in Nature Early Bronco Knowledge Base Steering Shaft Mod: 3/4 Round to DD Adding a new lower steering shaft to your early Bronco sometimes requires modifying your stock steering shaft from 3/4 round to a 3/4 DD in order to fit the new steering yoke on the shaft. This is a simple process that requires a grinder and bench vice. Watch the video below, as Jim Creel shows you exactly what to do to prepare your factory steering shaft for a new collapsible lower shaft.