How many gears in automatic for 98 mustang gt
 

I was driving and noticed that my automatic transmission in my 98 gt seemed to shift 4 times which would make it have 5 gears, but this can't be right. So I watched the rpms and started off from a dead stop and the rpms dropped 4 times. Whats the deal with that.

2nd,3rd,drive and then overdrive.

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Black 99 GT
3.73 gears
Mac power chamber
2 chamber Flows
Mac cold air induction
steeda tri-ax
Nitto drag radials
13.62 @ 109 (using a G-tech pro)

I thought it was 1st, 2nd, 3rd, OD, & Lockup.

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99 Silver GT
4R70W, Borla Cat Back,
SHM Slotted Rotors, custom 10.5" ProTorque 2600 stall converter, Transgo Shift kit, Redline Synthetic ATF, Cooler, Bassani X-Pipe, Vortech V2 S-trim, 3.73 gears, 70 mm T/B, Mac Adj. uppers & lowers, ROH ZR6 17X9.5 & 17X8.5 with Nittos, BBK(Walbro) 255 pump & FMS Shorty Headers, D&D Tubular K-member, Coil-overs, & A-arms. Currently running 3.33 pulley at 12-13 psi with AFM powerpipe, but not dynoed yet.
Dyno:
316 rwhp
332 rwtq
Dyno 3/26/00 After fuel mod, FMS headers & Pro Torque Converter.(RUN #6)
338 rwhp
342 rwtq