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Remanufactured Valve Body
Internal
Direct Drum Sleeve Kit 34838-01K
In 4L80-E units, part can be used in either early or late-model drums.
-
Helps cure:
- Direct clutch failure
- Delayed 3rd
- Delayed Reverse
- Code 87, 730, 756, 1811
- No 3rd
- No Reverse
- Maximum line presssure
- No 4th
- 2nd Gear starts w/MIL on
- TCC slip codes
Extreme Duty Forward Clutch Hub Kit 34322-02K
Extreme Duty Input Shaft 34670-02
Extreme Duty Main Shaft 34672-05
Forward Clutch Hub Front Washer 34298-078
Forward Clutch Hub Washer (Rear) 34301-078
Forward Clutch Drum
- Material: Steel
- Thickness: 0.078"
- Outer Dia.: 1.780"
- Inner Dia.: 1.405"
-
Helps cure:
- Excess front endplay
- Forward clutch & sealing ring failure
- Reduced bearing, thrust washer & sealing ring life
Forward Clutch Hub Washer (Rear) 34301-094
Forward Clutch Drum
- Material: Steel
- Thickness: 0.094"
- Outer Dia.: 1.780"
- Inner Dia.: 1.405"
-
Helps cure:
- Excess front endplay
- Forward clutch & sealing ring failure
- Reduced bearing, thrust washer & sealing ring life
Front/Rear Unit Endplay Shim 34500-Z
Updated 3-tang style shim fits all units, including '97-later 4L80-E and 4L85-E units.
- Material: Steel
- Tang Count: 3
- Inner Dia.: 1.165"
- Thickness: 0.010"
- Outer Dia.: 1.940"
-
Helps cure:
- Excess front endplay
- Excess rear endplay
- Burnt Forward clutch
- Premature seal ring failure
Heavy Duty Forward Clutch Hub 34322-01
Heavy Duty Input Shaft 34670-01
Heavy Duty Intermediate Clutch Backing Plate 34144HD-02
Heavy Duty Main Shaft 34672-01
Oversized Seal Rings 34716-01
- Material: PTFE
- Seal Style: Solid
- Height: 0.096"
- Width: 0.101"
- Outer Dia.: 0.918"
-
Helps cure:
- Wear grooves in the Forward drum ID bore
- Delayed engagement
- Burnt Forward clutch
Pinion Batwing Washer 34880-03
Output & reaction planetaries, '99-later
-
Helps cure:
- Lost or damaged component
Pinion Pin 34875-01
Fits output and reaction planetaries for all model years.
-
Helps cure:
- Lost or damaged component
Pinion Roller 34880-02
Output & reaction planetaries, 1999 & Later
-
Helps cure:
- Lost or damaged component
Planetary Thrust Bearing 34821-01
- Bearing Style: Enclosed
- Material: Hardened Steel
- Outer Dia.: 1.802"
- Thickness: 0.168"
- Inner Dia.: 1.132"
-
Helps cure:
- Lost or damaged component
Rear Unit Endplay Shim 34006-05
Thrust Bearing 65405
4L80-E/4L85-E: Fits OD planet/fwd drum; 200: Fits front internal gear-to-carrier
- Bearing Style: Enclosed
- Material: Hardened Steel
- Outer Dia.: 2.351"
- Thickness: 0.140"
- Inner Dia.: 1.604"
-
Helps cure:
- Bearing noise
- Bearing failure
Linkage
Manual Shift Shaft Kit 38511-04K
Long version, fits ’95-later with external NSS. '95-Later with external neutral safety swich
-
Helps cure:
- Lost or damaged component
Shift Lever Kit 38512-03K
Pump
Boost Valve Kit 34200-10K
Boost Valve Kit 34200-01K
Boost Valve Kit 34200-03K
Line Pressure Booster Kit 4L80E-LB1
Lube Regulated Pressure Regulator Valve 34200-14K
O-Ringed End Plug Kit 34994-14K
O-Ringed End Plug Kit 34200-05K
O-Ringed End Plug Kit 34994-13
Stator Support Bushing 34016-W
Front Stator Support
- Bushing Style: Precision
- Material: Steel-backed bimetal
- Width: 0.675"
- Shaft Dia.: 1.123"
- Housing Bore: 1.244"
-
Helps cure:
- TCC slip codes
- No lockup
- Overheated fluid
- No Overdrive
Valve Body
(View Valve Body Layout Diagram)
#7 Low/Reverse Checkball Seat 34200-52
1-2 & 2-3 Shift Valve Spring Kit 34994-02K
-
Helps cure:
- Repeated Solenoid B code 86
- Repeated Solenoid B code 87
- 2nd Gear starts
- No 4th
- 3-4 Neutral
- No 3rd
2-3 Accumulator Spring 34931-01
3rd & Reverse Checkball Sleeve Kit 34200-47K
AFL Filter End Plug & O-Ring Kit 34994-17K
Actuator Feed Limit Valve Kit 34200-16K
-
Helps cure:
- Wrong gear starts
- Clutch failure
- Solenoid performance codes
- No 4th
- Band failure
- Low solenoid feed pressure
- 2-3 Neutral
- 2nd Gear starts
- Code 68, 85, 86, 87
-
Tooling:
- 77754-TL
EPC Solenoid Harness Adapter 34435-01K
For use with early-style ('92–'02) EPC solenoid in late-style (’03-later) units, solenoid not included.
-
Helps cure:
- Line pressure instability
Oversized Accumulator Control Valve Kit 34994-22K
-
Helps cure:
- Soft shift & low accumulator pressure
- High line pressure in Drive
- Low line rise in Reverse
-
Tooling:
- F-34994-TL22
- VB-FIX
Oversized TCC Regulator Valve Kit 34994-18K
-
Helps cure:
- TCC codes
- TCC apply & release concerns
- Converter shudder
- Burnt converter
-
Tooling:
- F-34994-TL18
- VB-FIX
Performance Pack HP-4L80E-01
Reverse Checkball Sleeve 34200-38
Smart-Tech® Overrun Clutch Valve Kit 34200-40K
Fits units '97-later.
-
Helps cure:
- OD roller clutch failure
- No Forward
- Overrun clutch distress
TCC Regulator Valve Kit 34994-01K
The Sure Cure® Kit SC-4L80E
-
Helps cure:
- Burnt converter
- Bushing walks out
- Case damage
- Clutch failure
- Band failure
- Solenoid performance codes
- Broken parts due to excessive line pressure
- Buzzing noise
- Metal contamination
- Output shaft & case damage
- High line pressure
- Uncontrollable line rise
- 2-3 Neutral
- 3-4 Neutral
- No 4th
- 2nd Gear starts
- Wrong gear starts
- Converter shudder
- TCC apply & release concerns
- TCC slip codes
-
Tooling:
- 77754-TL
Case
Case Bushing 34006-SP
Case, No Walk Out
- Material: Bronze
- Bushing Style: Precision
- Width: 0.630"
- Shaft Dia.: 2.006"
- Housing Bore: 2.129"
-
Helps cure:
- Bushing walks out
Case Saver Retainer 34762-20
Heavy Duty Case Bushing Kit 34006-SPB
Shift Cable Mount Bracket 34913-01
-
Helps cure:
- Early cases without shifter bracket bosses cannot be used in '96–'97 vehicles
- Damaged OE shifter bracket bosses
Servo/Band
Reverse Servo Spacer Kit 34528-01K
Fits '96-later.
-
Helps cure:
- Broken Low/Reverse servo piston
- No Reverse
Tech Resources
August 12, 2024
4L80-E Shift Lever Kit for Custom Transmission Builds
June 22, 2023
4L80-E Performance & Heavy-Duty Transmission Build Guides
January 25, 2023
Uncovering the Root Cause of Pressure & Complaints – The Critical Role of Solenoid Modulator & AFL Valves
Maura Stafford
October 13, 2022
Line-to-Lube/Converter: A Balancing Act — PR Valve Position is Key
Maura Stafford
October 13, 2022
How to Get Started with OE ECU Reprogramming
Jim Mobley
September 29, 2021
See What's Inside the Sonnax 4L80-E Performance Pack
December 23, 2019
GM 4L80-E, 4L85-E, TH400 Valve Body Layout
October 24, 2018
Clean Up Your Shifts with Sonnax Line Pressure Booster Kits
August 15, 2017
Basic Installation Steps for the Smart-Tech® Overrun Clutch Valve Kit
June 22, 2017
Outsmarting 4L80-E Overdrive Roller Clutch Failure
December 23, 2015
Playing with Transmissions: Setting Total Endplay to Prevent TH400 Gear Train Failure
Randall Schroeder
April 07, 2015
Drilling Orifices the Smart Way
February 21, 2013
GM 4L80-E Vacuum Test Guide
January 22, 2012
Diagnosing the Elusive NO REVERSE with the 4L80-E
Randall Schroeder
April 02, 2008
An Easier Way to Rebuild Planets
Gregg Nader
September 05, 2007
Conquering the Planets
Gregg Nader
January 14, 2005
AFL and AFL
Frank Biolsi
September 15, 2003
Beyond 1870: GM Converter Codes P0741, P0742 and 1887
Gregg Nader