2004 Colorado I5 3.5 4x4 Transmission Drop

1. Depends on your experience, skill-level and setting (e.g. tools, shop, etc.). Can run from an afternoon to days...only you can tell.
2. Torque wrench, floor jack, or tranny stand, ratchet swivels and "service manual."
3. Again, only you can tell...it's all based on the experience.
4. Take your time, follow the service manual's steps and keep track of where all the parts came off/go.
5. Yes, but you will drain the fluid before cracking tranny loose and then refill upon completion. Get the proper gaskets and seals plus speedy dry for the mess.

Good luck & I'm sure more members will chime in with extra tips/tricks.

A 3' extension helps in the bell housing bolt removal. When going back, after a couple of bell housing bots are in make sure the torque converter turns free. A curved pic is handy when removing retaining clips for the lines.