got a question that i cant figure out

So how do I fix the u joint? Could it just need to be lubed?

Another question to add. I went down to a smaller wheel siz e now speedo is off by 10mph at freeway speed. Is there a quick way to fix this?

Yup, make some marks on the dash during a recalibration lol.
or
You have to change your speedometer gear, someone will know of a source of these on here

Ok so update today I noticed no matter if clutch is in our out, or if I'm in neutral if the truck is rolling it makes the sound. It's becoming really annoying. Please help lol