I know this, I've got 2 boilermakers on hand to help with the majority of it. I did a general engineers course several years ago so I know I can weld. Its just a matter of following directions properly. Its not something that's happening overnight, nor do I plan on rushing anything. I've been looking into minitrucks and how they set up their rears. I've got a rolla diff coming for free hence the questions, I wasn't sure if a mini spool+billet axles would be enough to handle 400max hp.