The 4L80-E is a fully automatic rear wheel drive electronically controlled
transmission. The 4L80-E provides four forward ranges, including overdrive and
reverse. A gear type of oil pump controls shift points. The powertrain control module (PCM)
and the pressure control (PC) solenoid, force motor, regulate these shift
points. The PCM also controls shift schedules and TCC apply rates. Transmission
temperature also influences shift schedules and TCC apply rates.
You can operate the transmission in any one of the following seven modes:
| • | P - PARK position prevents the vehicle from rolling either forward
or backward on vehicles less than 15,000 G.V.W. For safety reasons, use the
parking brake in addition to the park position. |
| • | R - REVERSE allows the vehicle to be operated in a rearward direction. |
| • | N - NEUTRAL allows the engine to be started and operated while
driving the vehicle. If necessary, you may select this position in order to restart
the engine with the vehicle moving. |
| • | OD - OVERDRIVE is used for all normal driving conditions. Overdrive
provides four gear ratios plus a converter clutch operation. Depress the accelerator
in order to downshift for safe passing. |
| • | D - DRIVE position is used for city traffic, and hilly terrain.
Drive provides three gear ranges. Depress the accelerator in order to downshift. |
| • | 2 - Manual SECOND provides acceleration and engine braking or greater
traction from a stop. When you choose manual SECOND, the vehicle will start out
in first gear and upshift to second gear. You may select this gear at a vehicle
speed of up to 22 km/h (35 mph). |
| • | 1 - Manual LOW provides maximum engine braking. You may select
this gear at a vehicle speed of up to 13 km/h (20 mph). |
