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only mods direwolf20 pack has that mindcrack dont is gravity gun and compact solars but thay use same IDs so any compact solars will turn into advanced ones only problem i can see is you wont have any gregtech ores in the chunks already generated
Skull - We aren't using the Gravity gun or compact solars, so MAKE SURE TO BACK UP then upgrade to mindcrack. t's more fun. We can use mystcraft for new ores.
To confirm, you should have no issues switching packs provided you don't have Advanced Solar Panels and Compact Solars installed at the same time as they use the same block ID on purpose.