The cost of the gears is not bad, of course you have to do front and back so it does add up. The more labor you can do yourself the cheaper it is. I know properly setting up the gears was beyond my ability, so I ordered setup 3rd member and clamshell from ECGS. Adding the Detroit made it more expensive than just a gear swap.
It's easy enough to swap out the complete carriers yourself if handy with a wrench.
