diff problems
 

Hi guys, hope someone can help me. When i turn right out of a junction in rainy/slippy weather my right rear tire spins and it feels like the left rear is not getting power. this has put my in a couple hairy situations when i pull out and it just spins. I have tried to get it to do the same thing when starting off while heading straight and both seem to be pulling then. Seems like it only happens while setting off while turning. I'm puzzled. there is a three digit "GU6" in the glove compartment. thanks in advance for any help as I'm a noob to the 4x4 thing and the Blazer.