knocking noise from rear axle, (IRS) should i try to fix it myself please help

i have a 99 cobra, i had a 4.10 gear put in like 5 months ago, at a speedshop in forestpark georgia, and now it knocks when i let the clutch out and the rear tires start to turn, it is starting to get louder, i only have like $200 right now, so should i try it myself, i think that something is just loose, because it drives fine, but it is when i let the clutch out it knocks loud from the rear end
please help me out

yup that would be the place