I'm not sure what "shift kit" you're referring to. If you mean the type used in performance applications to firm up shifting I'm not aware of such a thing even being made for the Villager.
About 3900 lbs.
If you drained the pan it will be 5-6 quarts.
$237
The cam sensor on a 1996 Mercury Villager cost about $35 to $40. The sensor is actually manufactured by a Nissan subsidiary.
Less than ten dollars.
you can get one for less then $100 new
There is no power steering in a Mercury Villager at start up in cold weather due to a failing pump or low fluid. Fluid becomes much thicker in cold weather and is much harder to pump.
How much is converter worth on 2000 mercury villager
According to the ( 1996 ) Mercury Villager Owner Guide : With engine oil filter change : The 3.0L V6 engine takes ( 4.2 U.S. quarts / 5W-30 PREFERRED )
That would depend entirely on what state you live in?
Probably around $200 for the tank, and $200 for labor.
Around 1300 lbs. Consult your door jamb sticker.