Wrong axle length, green bearing fix?

You have to be careful here. If the sure grip has split side gears, you may not get sufficient engagement with the inner side gears.

https://www.forabodiesonly.com/mopar/threads/new-axles-too-short.517481/
If they are just shy of 29", most like 65-67 B body axles. 68-70 are 29 3/16"