Hey man, 5 pieces of helltooth + short man's finger (multiplies your gargantuan's into 3 smaller one) with humangloid rune + Tasker and theos + mask of jeram are required.
You can min/max this basic setup by rolling +15 percent grangantuan damage on your shoulders, chest and off-hand. I also find having a goldwrap belt + avarice band + goldfind legendary gem extremely helpful. With these goldfind pieces equipped my toughness jumps into the billions and I don't die.
Here's a link to my torment 10 speed farm build. I run from elite pack to elite pack with hex angry chicken and let my gargantuans clear each pack. Takes about 5 seconds tops per pack. Sometimes your gargantuans get stuck / fall behind so I just resummon them. Thanks to grave injustice they come off cooldown super fast.
http://www.diabloprogress.com/hero/ishpre-1155/Malebolgia/71015994