There isn't a single "D" drive gear in a 1994 Pontiac Bonneville SSE's transmission in the way you might be thinking. The "D" on the gear selector refers to the
drive range, which engages a complex system of gears within the automatic transmission. The specific gear ratios used within that "D" range will vary depending on speed and load, and are automatically selected by the transmission's internal mechanisms.
There's no single gear physically labeled "D". Instead, the transmission uses planetary gearsets and clutches to provide the different gear ratios needed for driving in "D".