U-Joint Installation & Clocking Diagram - Greasable Zerk Orientation Guide

This document is an illustrated tip sheet on universal joint (U-joint) installation, specifically covering the concept of 'clocking' a greasable U-joint. It shows a photograph of a cross-style U-joint with a grease zerk fitting, annotated with labels indicating which trunnions attach to the yoke and which attach to the stub shaft. A curved arrow around the joint indicates the directional rotation of the driveshaft. The text explains that when installing greasable joints, the zerk fitting should be positioned between the caps that primarily receive the directional force during forward driving conditions. The stated goal is that the zerk should be getting squeezed together (in compression) rather than pulled apart (in tension) as the joint transmits torque. The reader can learn the correct orientation of a greasable U-joint's zerk relative to drive rotation, which helps prevent zerk or joint failure. The document contains no year, make, model, part numbers, or torque specifications; it is a general service procedure applicable to greasable U-joints and was uploaded to a 1995 Ford Bronco gallery. Nothing in the document contradicts its application to that vehicle.