Rear-end Grind (96 Cobra)

I have a 96 Cobra with approximately 112,000 miles. I bought it brand new in 96 and have only made a couple of mods (4.56 gears and Flowmasters). Anyway, my problem is that I hear a grinding sound from the rear of the car whenever I hit the gas in 1st gear. The grind isn't bad if I take off slowly, but if I take off fairly fast, the grind is worse. I can feel it through the gas pedal too. What could be causing this? Gears? Transmission? I'm not a mechanic by any means, so I'm not sure what it could be. Any ideas from the Stangnet faithful :hail2: would be greatly appreciated. Thanks!
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I had this same problem! I took the U-Jont off to find the bearing were powder instead. U-Joints are like $15 with that many miles I would replace them anyway. Mine totaly went out when I was on the highway and I thought I lost my clutch cause I couldn't go over 55mph.