No kit that I'm aware of....as it would likely depend on what all you are trying to move up and how much.
Here's a write up: Toyota Drivetrain Lift ***EDIT*** Oops...just linked to the same thing Chuckles did....4Crawler was my first thought for a full "kit"****
It's a lot of work for the return *IF* you are planning a lot of other modifications to the suspension/drivetrain....I almost went that route with my build, but don't particularly like body lifts in the first place and I'm willing to completely remake the trans tunnel if necessary to get what I want.
I think it's a very good option for those keeping the IFS....but who haven't bought bumpers or sliders yet as all of that will have to be relocated to really take advantage of the concept.