[Grant Bowker]

Yes, the first group of 3 similar parts are pullers for the steering pivot pins. The design came from the maintenace manual for the C60X, except that modern bolts seem to mainly be made with a 2 inch threaded sector unless by special order so I made several so that I could increase the length of the puller in stages rather than hunting for a fully threaded 1/2-20 bolt over 3 inches long. Used yesterday afternoon, they worked nicely. On this truck I only needed the 2 shorter cylinders. I don't know if it was an oficially sanctioned modification or not, but someone had ground a short taper onto the pivot pins to make thm easier to start into the bearings. I don't remember seeing this before, but it seems to work.

The second pair of tools are indeed pushers for the pivot pins. The design came from the GM Service Bulletins. They are one each for the 5 inch joints and 6 inch joints, intended to be used after one cap is on (with standard 30 thou shim (or more if extra depth was stamped on the pivot housing) to push the second pin (already started) fully into the housing to take out all slack before measuring the shims needed at the second cap. The original design had a second layer of steel welded to the main plate rather than a nut but my reasoning was that the nut was easier to tap (manufacturted with threads) and that it is designed to take the full load of the bolt so there shouldn't be a need to tap the plate as well. The only other note is that it really needs to have all 4 corner bolts in place to ensure that the plate is parallel to the face of the housing if you want to use it to drive the pivot in to ensure good line-up. Once the pin is almost fully in the housing you might get away with only 2 bolts to hold it onto the housing but 4 adds strength and stability.

For guessing the purpose of Bob's jig, it may help to think of the vehicles he, Rob and I specialize in.