I think whatever was wrong with it before, it's probably in need of a rebuild now.
Some diags from Ford for the AOD:
MUSHY AND/OR EARLY UPSHIFTS OR UPSHIFT PILEUP
- Improper fluid level.
- Improperly adjusted, sticking, or damaged throttle linkage.
- Low main control pressure.
- Valve body bolts improperly torqued.
- Valve body valve or throttle control valve sticking.
- Sticking governor valve.
ENGINE OVERSPEEDS ON 2-3 SHIFT
- Improperly adjusted linkage.
- Oil pressure control system or improper band or clutch application.
- Damaged or worn high clutch and/or intermediate servo.
- Cut or leaking intermediate servo piston seals.
- Dirty valve body or sticking valves.
- Broken converter damper and/or hub
FORWARD ENGAGEMENT SLIPS, SHUDDERS, AND/OR CHATTERS
- Improper fluid level.
- Improperly adjusted or damaged linkage.
- Low main control pressure.
- Valve body bolts improperly torqued.
- Valve body dirty or valves sticking.
- Forward clutch piston check ball leaking and/or not seating.
- Cut and/or worn forward clutch piston seal.
- Leaking forward clutch stator support seal rings Nos. 3 and 4.
- Damaged low one-way clutch (planetary).
There's a whole list of diagnosis by symptom.
Diagnosis By Symptom
. All Upshifts Early
. Engine Overspeeds on 2-3 Shift
. Erratic Shifts
. Forward Engagement Slips/Shudders/Chatters
. Harsh Downshift Coasting Clunk
. Harsh and/or Delayed 2-3 Upshift
. Harsh and/or Delayed 3-4 Upshift
. Harsh Engagements With Warm Engine
. Initial Drive In 2ND or 3RD
. Initial Engagement Clunk W/Engine Warm
. Mushy and/or Early Upshifts or Upshift Pileup
. Mushy, Early, Soft, and/or Slipping 1-2 Upshift
. No Drive, Slips/Chatters In 1ST Gear In OD or D
. No Drive, Slips/Chatters In 2ND Gear
. No Engine Braking In Manual 2ND
. No Forced Downshifts
. No or Delayed Reverse Engage/No Engine Braking In Manual Low
. No or Delayed Forward Engagement
. No or Delayed Reverse Engagement
. No 1-2 Upshift
. No 2-3 Upshift
. No 3-4 Upshift
. Poor Vehicle Acceleration
. Reverse Shudders, Chatters, and/or Slips
. Rough Initial Engagement
. Rough or Mushy 4-2 or 3-1 Shift
. Rough Shudder 3-1 Shift at Closed Throttle In Overdrive
. Rough, Harsh, and/or Delayed 1-2 Upshift
. Shift Efforts High
. Shift Hunting 3-4 or 4-3
. Shift Points Incorrect
. Shift 1-3 In Overdrive
. Slipping 4TH Gear
. Slow Initial Engagement
. Soft, Early, and/or Mushy 2-3 Upshift
. Transmission Clunk or Squawk During 1-2 or 2-3
. Transmission Leaks
. Transmission Noisy (Other Than Valve Resonance)
. Transmission Noisy (with Valve Resonance)
. Transmission Overheats
. Vehicle Will Not Start