Chevrolet Silverado / GMC Sierra. Manual — part 1170
A condition where a shift is expected but does not occur for a period of time. This could be
described as a clutch or band engagement that does not occur as quickly as expected during
a part throttle or wide open throttle apply of the accelerator, or during manual downshifting
to a lower range. This term is also defined as LATE or EXTENDED.
Double Bump (Double Feel)
Two sudden and forceful applies of a clutch or a band.
Early
A condition where the shift occurs before the car has reached proper speed. This condition
tends to labor the engine after the upshift.
End Bump
A firmer feel at the end of a shift than at the start of the shift. This is also defined as END
FEEL or SLIP BUMP.
Firm
A noticeably quick apply of a clutch or band that is considered normal with a medium to
heavy throttle. This apply should not be confused with HARSH or ROUGH.
Flare
A quick increase in engine RPM along with a momentary loss of torque. This most generally
occurs during a shift. This condition is also defined as SLIPPING.
Harsh (Rough)
A more noticeable apply of a clutch or band than FIRM. This condition is considered
undesirable at any throttle position.
Hunting
A repeating quick series of upshifts and downshifts that causes a noticeable change in engine
RPM, such as a 4-3-4 shift pattern. This condition is also defined as BUSYNESS.
Initial Feel
A distinctly firmer feel at the start of a shift than at the finish of the shift.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Late
A shift that occurs when the engine RPM is higher than normal for a given amount of
throttle.
Shudder
A repeating jerking condition similar to CHUGGLE but more severe and rapid. This
condition may be most noticeable during certain ranges of vehicle speed.
Slipping
A noticeable increase in engine RPM without a vehicle speed increase. A slip usually occurs
during or after initial clutch or band apply.
Soft
A slow, almost unnoticeable clutch or band apply with very little shift feel.
Surge
A repeating engine related condition of acceleration and deceleration that is less intense
than CHUGGLE.
Tie-Up
A condition where two opposing clutch and/or bands are attempting to apply at the same
time causing the engine to labor with a noticeable loss of engine RPM.
Noise Conditions
Drive Link Noise
A whine or growl that increases or fades with vehicle speed, and is most noticeable under a
light throttle acceleration. It may also be noticeable in PARK or NEUTRAL operating
ranges with the vehicle stationary.
Final Drive Noise
A hum related to vehicle speed which is most noticeable under a light throttle acceleration.
Planetary Gear Noise
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
A whine related to vehicle speed, which is most noticeable in FIRST gear, SECOND gear,
FOURTH gear or REVERSE. The condition may become less noticeable, or go away, after
an upshift.
Pump Noise
A high pitched whine that increases in intensity with engine RPM. This condition may also
be noticeable in all operating ranges with the vehicle stationary or moving.
Torque Converter Noise
A whine usually noticed when a vehicle is stopped, and the transmission is in DRIVE or
REVERSE. The noise will increase with engine RPM.
Transmission Abbreviations
A/C
Air Conditioning
AC
Alternating Current
AT
Automatic Transmission
DC
Direct Current
DIC
Driver Information Center
DLC
Diagnostic Link Connector
DMM
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Digital Multimeter
DTC
Diagnostic Trouble Code
ECT
Engine Coolant Temperature
EMI
Electromagnetic Interference
IAT
Intake Air Temperature
IGN
Ignition
IPC
Instrument Panel Cluster
ISS
Input Speed Sensor
MAP
Manifold Absolute Pressure
MIL
Malfunction Indicator Lamp
NC
Normally Closed
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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