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There will be one main domain that will act as a landing page for the three divisions.

I am getting divisions that will be starting on a new domain name.

A company I am doing SEO work for is splitting into 3 and will be hosted on three separate domains. I am getting 2 of the 3, however, I am not getting the domain that has most links going to it.

What is the best practice to carry any link juice going to my divisions to the new domain names? Should I contact sites linking to my divisions content on the old site and ask them to link to my new sites? Should I do 301 redirects to help carry links to my new sites?

Also, I found this guide in moz http://moz.com/blog/seo-guide-how-to-properly-move-domains its from 2009, but is this still considered the best practices for moving to new domains or is there an updated guide I should be using?