you can reset the tranny software yourself by turning the key to position 2 and holding the gas pedal down to the floor for 20-30 seconds. (just read this on a post so I might have it wrong, but search for it on here)

mine is jerky when downshifting in sport mode (holds the gears longer) but I like it that way when in sport mode. drive is as smooth as can be.

I also have heard of tranny software updates from the dealer. You may want to read about this too since yours is an 01'

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2002 4.6is Dinan S2
Titanium Silver/Black Alcantara

DINAN
Stage 4 Engine Software
Automatic Transmission Software
High FlowThrottle Body
Free Flow Exhaust
Cold Air Intake System
High Flow Air Mass Meter
OTHER
CCFL Angel Eyes
Stealth XM Radio in ashtray : FM Mod
Pilot H3 Fog Bulbs
Cleared Headlights: Hi/Lo Beams
Hardwired Radar Detector
IN PROGRESS
Powerstop C/D Rotors: (on backorder)
W/EBC Red Stuff (F)
W/Axxis Deluxe (R)
Dice Ipod: Aux Input for XM
THINKING
SMG II
MK4
Bluetooth