Power to manual liftgate conversion

[z7111]

I do not like the reliability factors of a power liftgate. Has anyone swapped the power out for a manual release? I am ok with the power raise/lower option. I just want to have a manual release so I can still operate with a dead battery.

2007 Tahoe Z71

 

[z7111]

Can someone please at least tell me whether or not a manual release exists.........