1993 GMC Suburban Owner's Manual - Page 201

AM440002 Drdwhg /R Mud, Sand, Snow, Or Ice Whenyou drive' in mud,snoworsand,yourwheelswon'tgetgoodtraction. Youcan'taccelerateasquickly,turningismoredifficult,andyou'llneed longer braking distances. It'sbest to usea low gearwhenyou're in mud-thedeeper the mud,the lowerthegear. In reallydeepmud,theidea is to keepyourvehiclemoving so youdon'tgetstuck. Whenyoudriveonsand,you'llsenseachange'inwheeltraction. But it will dependuponhowlooselypackedthesand is. Onlooselypackedsand(as onbeachesorsanddunes)yourtires will tend to sink into the sand. This hasaneffect on steering,accelerating,andbraking.Youmaywanttoreduce theairpressureinyourtiresslightlywhendrivingonsand.This will improve traction. Hardpackedsnowandiceoffertheworsttiretraction.Onthesesurfaces,it's very easy to lose control. On wet ice, for example, the traction is so poor do getmoving,poor thatyou will havedifficultyaccelerating.Andifyou steeringanddifficultbrakingcancauseyoutoslideout of control. 4-33