1999 Buick Regal Owner's Manual - Page 86

yellowblue FIRST (1): This position gives you even more power (but lower fuel economy) than SECOND (2). You can use it on very steep hills, or in deep snow or mud. If the shift lever is put in FIRST (1), the transaxle won't shift into first gear until the vehicle is going slowly enough. Driver Selectable Shift (If Equipped) Press the driver selectable shift button to allow the transaxle to shift at higher engine speeds, increasing shift firmness and acceleration performance. NOTICE: If your front wheels can't rotate, don't try to drive. This might happen if you were stuck in very deep sand or mud or were up against a solid object. You could damage your transaxle. Also, if you stop when going uphill, don't hold your vehicle there with only the accelerator pedal. This could overheat and damage the transaxle. Use your brakes or shift into PARK (P) to hold your vehicle in position on a hill. The PERF SHIFT light on your instrument panel cluster will glow when the driver selectable shifting feature is in performance shift mode. Downshifts will occur at a lower percentage of accelerator use while you're in the driver selectable shift mode. 2-26