I know it down grades you to 1.2.3 but its only on YogBox you will also not have your worlds on YogBox because YogBox does not use the .minecraft folder to run sorry technic pack: www.technicpack.net
Minecraft: Feed the Beast Modpack Review
MINECRAFT: Jurassic Park =]
Feed The Beast - CoOp with Friends - Episode 2
Technic with Sips - Part 3 - Pumping for Mulch
Hardcore Minecraft: Episode 2 - AFK Ownage!
MoreCreeps and Weirdos - Mod Spotlight
Tekkit with Duncan - Part 11 - Black Gold!
Tekkit - Episode 18 - Romance on Ice