yes it is the same cab all parts will bolt right on
No
The door will fit, but you may have trouble with the window reg, and bolting up the correct mirror.
if they have the same transmission then most likely but the 1990 is prob fuel injected and the 85 is not
You could find some on Autotrader or Craigslist for about $1500,depending on the condition.
go to the nearest glass shop
Mopar ATF+3 or Mopar ATF+4
no only up to a 1990 model
ford doesnt have a ram pickup ram is dodge
No.
Should be located in the fuelk tank- may have to remove for access
try changing your headlight switch I go through about one a year on my ram 1500.
Yes they are.