Hello All, I recently replaced my slip yoke on a 64 comet. Looks like a 4 inch section had been lathed down 1mm over the years. I have been told I need to replace my extension housing bushing as well. What I dont understand is that how did the extension housing bushing create this kind of wear on the slip yoke? Wouldn't the extension housing bushing wear down and then not support the slip yoke? If that were true you would think there would be no wear on the slip yoke at all. Please educate my brain. Chris
May not be the best answer, or the one you were hoping for, but engine bearings are constructed of materials very similar to your trans bushing and they will wear a steel or iron crankshaft journal too. Usually the wear rate is greater for the softer material, but not necessarily limited to the softer stuff. Ray
Hnstray's answer hit it about as close as you will come. Over the years I have seen a lot of yokes that were worn pretty badly because the bushing was worn out. The seal might not be keeping road grit out as well as it should or the driveshaft might have a slight vibration. You will need the proper size puller and driver to change the bushing. It is done with the extension housing on the trans in the car with these.
Those bushings have a steel outer shell, and once the soft bearing material is worn away, it's steel-on-steel. A more important question is what caused this in the first place? It's not all that common to see wear like that, and that didn't happen just overnight; that took some time. I can think of multiple things that could have caused such a failure, ranging from a bad/wrong clutch pilot bearing, to an improperly indexed trans, bad bearing in the trans, seal failure and running the trans low on lube, bad u-joint, bent or out-of-balance driveshaft, wrong driveshaft angle, bad trans mount, or bad pinion bearings in the rear axle. Or some combination of several of these.
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