I've considered toyota springs for the MJ multiple times. The problem you'll face on the MJ though is getting the shackle hanger far enough back. It's already all the way at the back of the chassis. You can hang the front springs further up, but also take into account how long of a shackle you'll need etc. I say go for it, Toyota springs float around all day long on RDC / DR. If they don't work, flip them.