Shifting Out Of Park (P) (Automatic Transmission) - Chevrolet Silverado Classic 2007 Owner's Manual

Torque Lock (Automatic Transmission)
If you are parking on a hill and you do not shift
your transmission into PARK (P) properly,
the weight of the vehicle may put too much force
on the parking pawl in the transmission. You
may find it difficult to pull the shift lever out
of PARK (P). This is called "torque lock." To
prevent torque lock, set the parking brake and then
shift into PARK (P) properly before you leave
the driver's seat. To find out how, see "Shifting Into
PARK (P)" listed earlier in this section.
When you are ready to drive, move the shift lever
out of PARK (P) before you release the parking
brake.
If torque lock does occur, you may need to have
another vehicle push yours a little uphill to
take some of the pressure from the parking pawl
in the transmission, so you can pull the shift
lever out of PARK (P).
Shifting Out of Park (P)
(Automatic Transmission)
Your vehicle has an automatic transmission shift
lock control system which locks the shift lever
in PARK (P) when the ignition is in the LOCK
position. You have to fully apply your regular
brakes before you can shift from PARK (P) when
the ignition is in RUN. See Automatic Transmission
Operation on page 136 and "Torque Lock"
under Shifting Out of Park (P) (Automatic
Transmission) on page 169.
If your vehicle has an Allison Transmission
transmission has a park pawl designed to hold the
higher weight of commercial medium duty
trucks. Therefore, the Allison Transmission
larger parts than other automatic transmissions.
These larger parts may sometimes make a
clunking noise when the selector lever is moved
from DRIVE (D) or REVERSE (R) to PARK (P).
This is normal and there is no damage occurring
during these shifts.
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