If you have the shifter in "D", then the shift pattern will be 1-2-3-4-4locked.
If you have the shifter in 3rd, then the shift pattern will be 1-2-3-3locked.
If you have the shifter in 1-2, the pattern is 1-2-2locked.
Unfortunately, when in D and a downshift from 4locked is needed, it goes straight down to 3rd gear, unlocked. I find this rather annoying on the highway, when all I really need is a few hundred rpm that the unlocked converter would give me in 4th...
The transmission only has 4 forward ratios, but the torque converter locking in 2nd, 3rd and 4th makes it feel like there are 3 additional "gears". However, the tranny will only lock up the highest gear you have the shifter selected for.
I drive around in 3rd most of the time, so there are 3 "shifts" (1-2-3-3lock), then if I click it into "D" there are 2 more shifts (4 and 4lock), so it feels a bit like a 5 speed auto. The higher you rev it, the less rpm difference there will be between unlocked and locked, because the converter is slipping less. If you time everything right though, it sounds just like a 5 speed! :>)
Cheap entertainment.....