what tools are a must have ?

5.99 hand pump from Harbor Freight to get the trans oil into the TRANS! (and possibly other uses) It has a real pump plunger, not the small hand pump bulb, that one is too lightweight. You need to have some kind of clip (unless you are real careful) to hold the tube in the fill tube. Although I have done it without,,,,it is tricky that way. Great thing to have while you diagnose Trans leaks.

Ditto to everything those have mentioned above, but I will also say a few odd tools like really small pointy screwdrivers and angled picks can really come in handy when you don't have a special (read expensive) tool. I have some old tools from my father that have come in handy.

A few different sizes of flashlights and a flex light and OH yeah one of those flexible mini cameras.....I am going to get one for engine work and sunroof investigations..... FUN

-TieRod end Wrenches (or large pipe Wrench)
-4/5/6/8 and 10 MM allen wrenches (I like the long reach ones with ball end they have at harbor freight fits 3/8 ratchet)
-Transmission Jack [Harbor Freight]
-Low Profile Jack
-Multi-meter
-Flywheel locking tool
-Snap ring pliers.
-Foot pound and inch pound torque wrenches.
-Compressor with air ratchets
-Tiedown straps capable of holding 500 pounds (if you ever remove the transmission..)