Originally Posted by
MrVimes
I also know there's probably not much difference in price between buying just a new freehub and a whole new hub or even wheel but I'm seriously limited for funds and will be cutting into my households basic budget for the parts but I need my bike to get to work so getting just the freehub seems like the most cost effective way forward.
As long as you have the freehub off, try flushing it with WD40 or similar in the gaps between the rotating parts and dripping some light oil inside.
Have you asked Diamondback?
https://www.diamondback.com/contact-diamondback-bikes