This is an article I read often when I think about upgrading to 44... although the article IS about a HP 30 out of a Charokee, it might help you a bit.
Jeep Drivetrain Components - Jp Magazine
I would say if you are set on the 30, and have the funds, I'd go with the 30 spline!!!
[COLOR="Red"]... I guess I'm gonna have to fix that too…….[/COLOR]
2005 Wrangler X 4.0/6 speed, Dana 30/Ford 8.8--4.88--Eaton E-Lockers, 35" MT/R, Smittybilt bumpers/rockers/winch, SonicFab tire carrier, RE 3.5 springs, Zone 1.25 BL, FullTraction 3 link upper rear, RE super flex lower rears, UCF ultra high skid and lo/pro mount, brown dog mml.
[URL="http://www.jeepforum.com/forum/f8/sonics-74-cj5-build-1106795/"][COLOR="DarkOrange"]1974 CJ5 BUILD THREAD[/COLOR][/URL]