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Chevrolet Silverado / GMC Sierra. Manual - part 1029
NO REVERSE OR SLIPS IN REVERSE
No Reverse or Slips in Reverse
1-2 Shift valve train
3-2 Shift solenoid valve assembly
Spacer plate or gaskets incorrect, mispositioned or
damaged
2-4 Servo Assembly (13-28)
Incorrect band apply pin
Missing or damaged servo seals
Porosity in piston, cover or case
Damaged piston seal grooves
Plugged or missing orifice cup plug
Case (103)
3rd Accumulator retainer and ball assembly leaking
Porosity in 3-4 accumulator piston or bore
3-4 Accumulator piston seal or seal grooves damaged
Plugged or missing orifice cup plug
Restricted oil passage
Input Housing Assembly
(621)
Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or
Hunting.
2-4 Band Assembly (602)
Worn or misassembled
Checks
Causes
Input Housing Assembly
(602)
3-4 Apply ring stuck in applied position
Forward clutch not releasing
Turbine shaft seals missing, cut or damaged
Manual Valve Link (89)
Disconnected
Valve Body Assembly (60)
2-3 Shift valve stuck
Manual linkage not adjusted
Spacer plate and gaskets incorrect, mispositioned or
damaged
Lo overrun valve stuck
Orificed cup plug restricted, missing or damaged
Reverse Input Clutch
Clutch plate worn
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
NO PART THROTTLE OR DELAYED DOWNSHIFTS
No Part Throttle or Delayed Downshifts
Assembly (605-614)
Reverse input housing and drum assembly cracked at
weld
Clutch plate retaining ring out of groove
Return spring assembly retaining ring out of groove
Seals cut or damaged
Restricted apply passage
Porosity in piston
Belleville plate installed incorrectly
Excessive clutch plate travel
Oversized housing
Lo and Reverse Clutch
(694-696)
Clutch plates worn
Porosity in piston
Seals damaged
Return spring assembly retaining ring mispositioned
Restricted apply passage
Reaction Sun Shell (670)
Broken spline on reaction sun shell/replace shell
Checks
Causes
Input Housing Assembly
(621)
3-4 Apply ring stuck in applied position
Forward clutch not releasing
Turbine shaft seals missing, cut or damaged
Manual Valve Link (89)
Disconnected
Valve Body Assembly (60)
2-3 Shift valve stuck
Manual linkage not adjusted
Spacer plate and gaskets incorrect, mispositioned or
damaged
Lo overrun valve stuck
Orificed cup plug restricted, missing or damaged
Reverse Input Clutch
Assembly (606-614)
Clutch plate worn
Reverse input housing and drum assembly cracked at
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
HARSH GARAGE SHIFT
Harsh Garage Shift
NO OVERRUN BRAKING - MANUAL 3-2-1
No Overrun Braking - Manual 3-2-1
weld
Clutch plate retaining ring out of groove
Return spring assembly retaining ring out of groove
Seals cut or damaged
Restricted apply passage
Porosity in piston
Belleville plate installed incorrectly
Excessive clutch plate travel
Oversized housing
Lo and Reverse Clutch
(694-696)
Clutch plates worn
Porosity in piston
Seals damaged
Return spring assembly retaining ring mispositioned
Restricted apply passage
Checks
Causes
Valve Body Assembly (60)
Orifice cup plug missing
Checkball missing
Checks
Causes
External Linkage
Not adjusted properly
Valve Body Assembly (60)
4-3 Sequence valve stuck
Checkball mispositioned
Spacer plate and gaskets incorrect, damaged or
mispositioned
Overrun and Forward
Clutch Assembly (644-651)
Turbine shaft oil passages plugged or not drilled
Turbine shaft seal rings damaged
Turbine shaft sealing balls loose or missing
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
NO TORQUE CONVERTER CLUTCH APPLY (300 RPM SLIP)
No Torque Converter Clutch (TCC) Apply
Porosity in forward or overrun clutch piston
Overrun piston seals cut or damaged
Overrun piston checkball not sealing
Checks
Causes
Valve Body Assembly (60)
Regulator apply valve side loading
Stuck converter clutch valve
Torque converter clutch (TCC) apply valve stuck closed
(debris in bore)
Torque converter clutch pulse width modulated (TCC
PWM) solenoid broken/cracked
Turbine shaft O-ring omitted
TCC PWM solenoid leaking
Input Housing and Turbine
Shaft Assembly (621)
Turbine shaft hole not drilled to full depth
Scratched turbine shaft journals
Turbine shaft O-ring omitted/damaged
Turbine shaft retainer and ball assembly restricted or
damaged
Electrical
12 volts not supplied to transmission
Outside electrical connector damaged
Inside electrical connector damaged
Wire harness damaged
TCC solenoid damaged
Electrical short (pinched wire)
TCC solenoid not grounded
Torque Converter Clutch (1) Internal damage (blue or distorted)
Oil Pump Assembly (4)
TCC spring cocked
Orifice cup plug restricted or damaged
Pump to case gasket mispositioned
Converter clutch valve retaining ring mispositioned
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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