K5 Blazer No Crank?

[steezyk5]

I have a 79 K5 that will not start.. It was running fine awhile back but when I went to start it one day it wouldn't crank. I tapped on the starter with a hammer which fixed the cranking issue but while I turned the key there was a clunking sound combined with the normal starter noise. I took the starter out to try and find anything wrong with it. It seemed fine, so I put it back in and now it's not cranking at all again. Along with no crank there's no parking brake light on the dash. Battery is good. Any ideas?