GMC 1999 Sierra 1500 Pickup Owner's Manual page 92

Features & Controls
FivemSpeed Manual lZransmission
(Without Low Gear)
I
K2220
This is your shift pattern. Here's how to operate your transmission:
K2386
1
(First Gear)-Press the clutch pedal and shift into 1. Then, slowly let
up on the clutch pedal as you press the accelerator pedal.
You can shift into 1 when you're going less than
20
mph
(32
kmlh). If
you've come to a complete stop and it's hard to shift into 1, put the
shift lever in Neutral and let up on the clutch. Press the clutch pedal
back down. Then shift into 1.
2-24