As mentioned above buy a complete working unit. setting up gears is not for a amateur (no offense). I have 2 3rd members for mine. A 2.94 gear for cruising and a 3.55 when I go to the track. I can swap them out in about 45 minutes
Oh yea! When you do this a number of times, it can get done fast. From opening the tool box to close of the box is an hours job. When you know what your doing by a few tries/times doing it.
I’d get it done in an hours time from box opening to close.