The cut-off date was June 2000...June 26 is normally quoted as the "official" date, as this was the last known date for the Job 1s to have been made.
Options wise, these are the differences:
Exterior:
Silver Frost (TS) added as an exterior color
Front license plate bracket standard (where required)
Transfer case skid plates standard on 4x4
16" Cast aluminum wheels made standard
P235/70R16 All-Season OWL tires standard
Mandarin Gold (B6) deleted as an exterior color
16" All-Terrain standard tires deleted
15" wheels deleted as standard
Interior:
Dual Media (CD/cassette) replaces single CD as standard Audio System
Some exterior colors limited to a single interior color
Functional:
5-speed manual transmission standard
4.0L SOHC V-6 flex fuel capable with automatic transmission
3200# payload package made standard
3.73 Axle standard
Options:
6-Disc In-Dash CD available with Pioneer Sound System (6-speakers and a subwoofer)
Automatic transmission required for Comfort Group, Premium Sport Group, Leather Comfort Group, Power Moonroof and 6-Disc In-Dash CD Sound System
Engine block heater standard in Twin Cities Region
High-Series floor console now standard with Cloth Comfort Group
Payload Package deleted
Misc:
Odometer features black numerals on a white background, replaces white numbers on black background
Oil fill moved to passenger side of the engine
Misaligned fuel filler door hinge fixed
Throttle Body/Intake beauty cover reduced in size
Cam covers now made of plastic composite, replaces aluminum valve covers
About this time Ford also introduced three trim levels to the ST, Value, Choice, and Premium. At this time options were not limited to certian trim levels, a trim level was a simple way for a dealer to order ST's with preconfigured options.
