grease on front end frame

I have alot of grease laying on my front end frame, I believe my boots are still in good shape. the grease seems to be coming from something that the second boot attaches to(second from the wheel going back to the engine). can anyone tell me what part this is? I'm getting grease on both sides that looks like it is being thrown from the spinnig of the part.
P.S. this is a 97 blazer 4x4 with a 4.3

thanks for your help

check the seals on your front differential each side has a seal that holds the oil in the diff if the seals are bad it will sling oil everywhere

Thanks but this is definitly a grease. I got in touch with a friend and he thinks it's my cv joints (which I thought were in the rubber boots). the grease is coming from a cylinder that ataches to the rubber boot.

thanks again Wdy