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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-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 34875-05
Overdrive planetary, .855" long rollers fit '98-earlier only.
- Length: 0.855"
- Dia.: 0.125"
-
Helps cure:
- Lost or damaged component
Pinion Roller 34880-02
Output & reaction planetaries, 1999 & Later
-
Helps cure:
- Lost or damaged component
Pinion Thrust Washer 34875-04
For '98-earlier output and reaction planetaries with .750" wide pinion gears.
-
Helps cure:
- Lost or damaged component
Planetary Rebuild Kit 34875RK
Output & reaction planetaries, '69–'98 with .750" wide pinion gears
-
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
Rubber Clutch Separator ORCS-103-380
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
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
Case Saver Retainer 34762-10
Heavy Duty Case Bushing Kit 34006-SPB
Manual Shift Shaft Kit 38511-01K
'91–'94 Without external NSS, short version
-
Helps cure:
- Lost or damaged component
Manual Shift Shaft Kit 38511-03K
Short Version, Retrofits ’95-later detent levers to early ’91-’94 units without external NSS.
-
Helps cure:
- Lost or damaged component
Manual Shift Shaft Kit 38511-04K
Long version, fits '95-later units with external neutral safety switch. '95-Later with external neutral safety swich
-
Helps cure:
- Lost or damaged component
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
Adjustable Rear Servo Pin Kit 34912-01K
Heavy Duty Low/Reverse Servo Piston 34914-01
Heavy Duty Low/Reverse Servo Piston 34914-02
Reverse Servo Spacer Kit 34528-01K
Fits '96-later.
-
Helps cure:
- Broken Low/Reverse servo piston
- No Reverse
Other
4th Accumulator Repair Kit 34805-01K
-
Helps cure:
- Damaged accumulator bore
- Poor shift quality
- Loss of accumulator control
Wiring Harness Connector Bracket 34998-01K
Fits late style, gray connector
-
Helps cure:
- Connector pushed into pan area
- Retention tabs break off wiring harness connector
Tech Resources
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
September 29, 2021
See What's Inside the New Sonnax 4L80-E Performance Pack
September 14, 2020
Transmissions & Oversized Tires: How Changing Gear Ratios Helps Prevent Drivetrain Damage
Jason Larochelle
June 08, 2020
Hydraulics Fundamentals Part VIII: Check Valves
April 20, 2020
Hydraulics Fundamentals Part VII: AFL/Solenoid Modulator Valves
December 23, 2019
GM 4L80-E, 4L85-E, TH400 Valve Body Layout
May 03, 2019
Hydraulics Fundamentals Part IV: Converter Clutch Control
Bob Warnke
October 24, 2018
Clean Up Your Shifts with Sonnax Line Pressure Booster Kits
February 12, 2018
Transmission Report: How Small Changes Led to the New Form & Function of Gen. 2 6T70/75 Valve Bodies
August 15, 2017
Basic Installation Steps for the Smart-Tech® Overrun Clutch Valve Kit
June 22, 2017
Outsmarting 4L80-E Overdrive Roller Clutch Failure
May 24, 2017
Your Guide to Summer Towing Transmission Repairs & Upgrades
March 29, 2017
Transmission Report: Sonnax Voted Tops for Parts & Tools!
March 02, 2017
It’s Snow Plowing Season Again! Understanding 4L80-E Overdrive Roller Clutch Failure
Jim Dial
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 01, 2013
GM 4L80-E Case Checkball Locations
Valve Body Xpress
January 01, 2013
GM 4L80-E Valve Body Identification
Valve Body Xpress
January 22, 2012
Reverse Drum Wear: a 4L80-E True Story
Randall Schroeder
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
May 19, 2006
SonnaFlow® Chart: 4L80-E (Poor)
May 19, 2006
SonnaFlow® Chart: 4L80-E (Normal & Poor)
May 19, 2006
SonnaFlow® Chart: 4L80-E (Normal)
September 16, 2005
GM TCC Circuits
Maura Stafford
January 14, 2005
AFL and AFL
Frank Biolsi
September 15, 2003
Beyond 1870: GM Converter Codes P0741, P0742 and 1887
Gregg Nader