69 Chevy K10

I recently bought a 69 Chevy K10 with a 3 speed manual transmission (on the column.) I got the truck home and could not get the shift handle to go into position to put the transmission into reverse or 1st gear. I removed the gear shift handle and applied some PB Blasted into the internal areas to no avail. Can anyone help?

Have you looked under the hood at the linkage rods for binding?

Thanks for responding. The lithium grease in the column seemed to work.