Cadillac 1993 Eldorado Owners Literature page 98

1 (First Gear)
This position gives you even more power (but lower fuel economy)
than "2." You can use it on very steep hills, or in deep snow or mud. If
the selector lever is put in "1," the transaxle won't shift into first gear
until the vehicle is going slowly enough.
PARKIN%
BRAKE
I
84