Torque converter going out. Try adding some GM Limited Slip Additive to your transmission, about $9 for a small bottle at the Chevy shop.
could be a bad motor or transmission mount
Could be, time for a tune up.
Could be lots of causes, but most likely either rear differential issue or torque converter shudder in automatic transmission, though Ford is not nearly as common to have transmission shudder as a Chrysler is. Mine was the rear differential. (98, 5.4l). Mine was most pronounced when accelerating around a corner. Transmission shudder would most likely show up on acceleration at any time.
The Man Who Could Not Shudder was created in 1940.
Front wheel shudder could come from worn tires, bad brakes, or worn front end components. Check all of these to find the cause of the shudder.
The Man Who Could Not Shudder has 269 pages.
The Overdrive Light flashing indicates an internal transmission problem which could be caused by anthiny inside the transmission. Most likely the transmission would have to be removed and taken apart to find the problem.
The ISBN of The Man Who Could Not Shudder is 0-8217-1703-0.
There are a few reasons for a transmission to growl. It could be that the vehicle is low on fluid, and the gears are starting to grind, it could be that there is dirt within the system causing it to grind as well.
The Windstar transmission could have a seal that leaks worse as the transmission gets hot and the fluid is under pressure. Go to a car wash and clean the transmission good. Watch for several days to see where the fluid is leaking from so that you can find and fix the leak.
Transmission fluid, if you have a bad radiator.
the transmission could be going out or slipping or your transmission fluid could be low