OK, I got the 64 axle all mounted and hooked up in the 65. I decided since I was this far, I'd go ahead and replace the axle bearings too. I had to make a puller for them. The parts book shows them to be the same as 65-72 axles so they were in stock. The new bearing only has half as many rollers as the original and doesn't look near as stout. The parts guy even pointed that out. Now that I've got it all together, I can hear the axle going around the rollers in the new bearings on both sides. It may all be in my head but I think it's going to make noise when it rolls. It may be fine but I never heard anything like it. The axle didn't have a flat spot and didn't appear to be out of round.

'65 C-10, 65 L-60, 65 C-80, 72 C-60 & and a bunch of old Chevy cars.
Never time to do it right, always time to do it over.