Hello All,

I've recently bought a 2004 Crossfire with 40k on the clock and am enjoying the car. There is a whirring sound at roughly 75mph coming from what sounds like the diff. I have read that this is a common fault which would have been a warranty issue. On this forum there is a mixed opinions about whether to ignore the problem or to rectify it. Pre-buying the car I did have in my mind that I fancied a LSD diff and was going to inquire anyway. I think I have the bolt on diff. Also i don't have warranty. What I would like to know is:

-If my diff is the bolt on type can I convert my diff to have LSD?
-If so, would the whirring issue go?
-If It can't be converted does anyone out there manufacture a LSD diff to bolt straight on?
-If so, how much does it cost?

Thank you in advance for your replies. Sorry if this has been posted before but there is a lot of info to read.