44's are pushing the limits of that D60/14bff combo, truth be known.
A set of Dedenbear (now REID) knuckles, some 4340 alloy axles shafts w/super duty u-joints in that D60 will add a lot of strength and mainly will add more durability to getcha home.
Here's a great place to find all that stuff, ask for Doug, he's a great guy to deal with.
http://extremeaxlesales.com/contact-us.aspx
Then there's the one ton drive lines and joints you'll be needing...