I'm not sure what you have when you say "mud busters" So:
Here is what I use to have on front and back. These tires are pretty much worthless when your in sloppy or quicksand type of mud:
I changed out my rear tires to these. This type of tread (as others have stated) will toss the mud out of the cleats. I love these tires!! You can see the difference between the old tread and the Gator tread tires:
And for the front, I changed to these skinner tires because I needed the front width to fit between my pickup's bed wheelwell's. These front tires are great as well and grab much better and are much better at self cleaning than the old tires.
If you need brand names and sizes, lemme know. I'll look at the tires and get that info.