It can be unsafe, but It doesnt have to be. I have monoleafs and 4in blocks and I check my leafsprings for wear once a week. If a spring is going to break you would catch it by doing that. So I consider my truck to be safe. After paint I am gettin a 4link thoughcab said:I think you can layout with monoleafs and 4" blocks, but it's pretty unsafe. If you wanna lay out, just get a 4-link and do it right. That's just my opinion tho.