Im going to change eventually the front differential fluid, i was thinking valvoline since it comes with a pouch but my work collegue said "no you cant cause it has limited slip additive" and told me to get the regular valvoline What you guys think? is it ok to put synthetic lucas,valvoline...

I have a 95' Dana 44 with an airlocker in it when I bought the truck. Redoing suspension, and front stub shaft is getting replaced as old one is toast. I realize it needs clipped on the inside of diff, everything is apart, but as there's an airlocker, how do I get the stub shaft back in, and...