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Clutch Volume Spacer Kit 34554-11K
Direct Drum Sleeve Kit 34838-01K
In 4L80-E units, part can be used in either early or late-model drums.
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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
Featured
Extreme Duty Forward Clutch Hub Kit 34322-02K
Featured
Extreme Duty Input Shaft 27280-02
Featured
Extreme Duty Input Shaft 35280-02
Featured
Extreme Duty Main Shaft 34672-05
Forward & Direct Clutch Inner Snap Ring 34577-01
Fits AT-540/543/545.
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Helps cure:
- Lost or damaged component
Forward Clutch Hub Front Washer 34298-078
Forward Clutch Hub Washer (Rear) 34301-094
Forward Clutch Drum
- Material: Steel
- Thickness: 0.094"
- Outer Dia.: 1.780"
- Inner Dia.: 1.405"
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Helps cure:
- Excess front endplay
- Forward clutch & sealing ring failure
- Reduced bearing, thrust washer & sealing ring life
Forward Clutch Hub Washer (Rear) 34301-078
Forward Clutch Drum
- Material: Steel
- Thickness: 0.078"
- Outer Dia.: 1.780"
- Inner Dia.: 1.405"
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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"
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Helps cure:
- Excess front endplay
- Excess rear endplay
- Burnt Forward clutch
- Premature seal ring failure
Featured
Heavy Duty Forward Clutch Hub 34322-01
Featured
Heavy Duty Forward Drum 34554-01
Featured
Heavy Duty Input Shaft 30280-02
Featured
Heavy Duty Input Shaft 30280-01
Heavy Duty Intermediate Clutch Backing Plate 34144HD-01
Heavy Duty Main Shaft 34672-01
High RPM Checkball Capsule 57510-01
Pinion Pin 34875-01
Fits output and reaction planetaries for all model years.
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Helps cure:
- Lost or damaged component
Pinion Thrust Washer 34875-04
For output and reaction planetaries, fits all TH400, 4T65-E and '98-earlier 4L80-E with .750" wide pinion gears.
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Helps cure:
- Lost or damaged component
Planetary Rebuild Kit 34875RK
For output and reaction planetaries, fits all TH400 and '98-earlier 4L80-E with .750" wide pinion gears.
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Helps cure:
- Lost or damaged component
Rear Unit Endplay Shim 34006-05
Rubber Clutch Separator ORCS-070-380
Rubber Clutch Separator ORCS-103-380
Featured
Smart-Tech® Drum Module 34555-01K
Shift Lever Kit 38512-01K
Big Shaft Stator Support Tube Kit 28154S-125
Boost Valve Kit 34910-05K
Boost Valve Kit 34910-01K
Front Pump Bolt 28136
Line Pressure Booster Kit 400-LB1
Pressure Regulator Valve Kit 34910-03K
Pump Bushing 34234B-01
Pump Bushing 34034T-01
Stator Support Bushing 35007A
- Bushing Style: Precision
- Material: Steel-backed copper alloy
- Width: 0.500"
- Housing Bore: 1.121"
- Inner Dia.: 1.004"
- Shaft Dia.: 1.002"
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Helps cure:
- Bushing wear
- Bushing failure
Stator Support Shaft 34910S-01
Case Bushing 34006-SP
Case, No Walk Out"
- Material: Bronze
- Bushing Style: Precision
- Width: 0.630"
- Shaft Dia.: 2.006"
- Housing Bore: 2.129"
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Helps cure:
- Bushing walks out
Case Saver Retainer 34762-10
Heavy Duty Case Bushing Kit 34006-SPB
Oil Pan Stud Kit 28711-01K
Adjustable Rear Servo Pin Kit 34912-01K
Heavy Duty Low/Reverse Servo Piston 34914-01
Tech Resources
FEATURED
December 23, 2019
Valve Body Layout
GM 4L80-E, 4L85-E, TH400 Valve Body Layout
October 21, 2022
FAQs About the TH400 Smart-Tech Drum Module
August 12, 2024
4L80-E Shift Lever Kit for Custom Transmission Builds
January 09, 2024
Easy TH400, 4L80-E Reverse Servo Setup: Craft Your Own Tool
Caleb Perham
December 07, 2022
How to Assemble & Install the TH400 Smart-Tech Drum Module
June 16, 2022
Improve TH400 Performance, Consistency & Safety with the Smart-Tech Drum Module
January 05, 2022
TH400 Forward Drum & Input Shaft Upgrade Options
October 24, 2018
Clean Up Your Shifts with Sonnax Line Pressure Booster Kits
May 24, 2017
Your Guide to Summer Towing Transmission Repairs & Upgrades
December 23, 2015
Playing with Transmissions: Setting Total Endplay to Prevent TH400 Gear Train Failure
Randall Schroeder
May 19, 2006
SonnaFlow® Chart: TH400 (Normal)
May 19, 2006