After determining I must have a binding issue at the transmission pilot bushing interface.(see recent post `Working backwards`) I have removed the transmission, clutch and the existing pilot bushing . The bushing came out grudgingly with the bread method of extraction. The bushing is worn in an uneven shape inside indicating a poorly aligned trans. shaft . The OD of this bushing measures 1.091 in I ordered two replacement bushings: A Dorman 690034 the one to use with original powerglide to manual conversion for 50 to 52 235`s. this has an OD of 1.060 in .and an ID of .593 in. I slipped this bushing right into the crankshaft hole by hand and it `s not even a snug fit at all. The second bushing is the replacement bushing for the damaged one I extracted, it is National part number PB-656-HD with an ID of .592 and OD of 1.096. Both bushings slide easily over the transmission snout and seem a good easy fit. (NO apparent damage to transmission snout). Perhaps this engine` s crank had been re-machined to fit the common Chevy size bushing. I have eliminated the Dorman 690034 as a possibility as it`s too small for the hole . The national bushing I ordered actually slightly bigger in OD and I had a difficult time originally driving the damaged bushing in (used a socket and dead-blow hammer, so the new one would probably need a shave to fit. I don`t have easy access to a lathe ,but may be able to arrange some work at a machine shop. It`s not brain surgery but it`s beginning to feel like it! Any suggestions?
