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Bearing Race GM-N-13R

  • AT-500
  • TH400 (3L80), AT-540
This part has been discontinued.

Case Bushing 34006-OS

  • 4L80-E
  • 4L85-E
  • TH400
  • Case
This part has been discontinued. Click here to see the part instructions.

End Plug Kit 34994-11

  • 4L80-E
  • 4L85-E
  • Fits TCC valve bore with .500" dia.
This part has been discontinued.

Pinion Pin 34875-01

  • 4L80-E
  • 4L85-E
  • TH400
  • Fits output and reaction planetaries for all model years.

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4L80-E, 4L85-E, TH400 Pinion Pin 34875-01

4L80-E
Remanufactured Valve Body GM026

'91-'92, with Screw in Temp Sensor

This part has been discontinued. Click here to see the part instructions.

Rear Unit Endplay Shim 34006-05

  • 4L80-E
  • 4L85-E
  • TH400
  • TH425
  • .005" Thick

Sonnax offers two solutions for excessive endplay in GM TH400, TH425, 4L80-E and 4L85-E units. Sonnax rear unit endplay shim 34006-05 can be stacked under the four...Read More

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4L80-E, 4L85-E, TH400, TH425 Rear Unit Endplay Shim 34006-05

Turbine Hub GM-HT-HS

  • Buick TH350
  • TH400 (3L80), AT-540

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Buick TH350, TH400 (3L80), AT-540 Turbine Hub GM-HT-HS

Thrust Bearing 65405

  • 200-4R
  • 4L80-E
  • 4L85-E
  • TH200
  • 4L80-E/4L85-E: Fits OD planet/fwd drum; 200: Fits front internal gear-to-carrier

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200-4R, 4L80-E, 4L85-E, TH200 Thrust Bearing 65405

Stator Cap GM-WP14-OE

  • BorgWarner 310mm NLU
  • TH400 (3L80), AT-540

Sonnax stator cap GM-WP14-OE is molded from a high performance phenolic resin. A significant upgrade over the OE thrust spacer, it has been designed specifically f...Read More

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BorgWarner 310mm NLU, TH400 (3L80), AT-540 Stator Cap GM-WP14-OE

4L80-E, 4L85-E
Heavy Duty Remanufactured Valve Body GM030

Fits '04-later units. Smart-Tech® overrun clutch valve kit installed.

Sonnax heavy duty remanufactured valve body GM030 has been designed with the workhorse vehicle in mind. Featuring the Sonnax patented 34200-40K Smart-Tech overrun ...Read More

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4L80-E, 4L85-E Heavy Duty Remanufactured Valve Body GM030

4L80-E, 4L85-E
Heavy Duty Remanufactured Valve Body GM033

Fits '97–'03 units. Smart-Tech® overrun clutch valve kit installed.

Sonnax heavy duty remanufactured valve body GM033 has been designed with the workhorse vehicle in mind. Featuring the Sonnax patented 34200-40K Smart-Tech overrun ...Read More

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4L80-E, 4L85-E Heavy Duty Remanufactured Valve Body GM033

Performance Pack HP-4L80E-01

  • 4L80-E
  • 4L85-E

Sonnax Performance Pack HP-4L80E-01 upgrades GM 4L80-E and 4L85-E transmissions for maximum performance and durability in work/sport vehicles. Innovative component...Read More

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4L80-E, 4L85-E Performance Pack HP-4L80E-01

Impeller Hub GM-90-4G

  • Buick TH350
  • Chevy TH350
  • TH400 (3L80), AT-540

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Buick TH350, Chevy TH350, TH400 (3L80), AT-540 Impeller Hub GM-90-4G

Mechanical Diode® GM-MD-4-2

Sonnax mechanical diode GM-MD-4-2 for GM 4L80-E, 4L85-E converters offers much greater strength than existing roller clutches and “dog bone” style sprags. This dio...Read More

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4L80-E, 4L85-E, Single-Plate Performance Converter (Mounting Ring) Mechanical Diode® GM-MD-4-2

Pilot GM-PI-21

  • 4L60-E (300mm), Single-Plate Performance Converter
  • 4L60-E, 4L65-E, 4L75-E (300mm), Multi-Plate Performance Converter
  • 4L80-E, 4L85-E, Multi-Plate Performance Converter

Sonnax pilot GM-PI-21 comes standard in the following 4L60-series Sonnax performance converter kits: GM-RK-405, GM-RK-405WC, GM-RK-408, GM-RK-408WC and GM-RK-17. ...Read More

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4L60-E (300mm), Single-Plate Performance Converter, 4L60-E, 4L65-E, 4L75-E (300mm), Multi-Plate Performance Converter, 4L80-E, 4L85-E, Multi-Plate Performance Converter Pilot GM-PI-21

Bearing Adapter GM-WA-44

  • BorgWarner 310mm NLU
  • Buick TH350
  • TH400 (3L80), AT-540

Sonnax bearing adapter GM-WA-44 has ribs and better support for the associated GM-N-8HLT thrust bearing, providing rebuilders with an improved option when replacin...Read More

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BorgWarner 310mm NLU, Buick TH350, TH400 (3L80), AT-540 Bearing Adapter GM-WA-44

Stator Cap GM-WP12-OE

  • BorgWarner 310mm NLU
  • Buick TH350
  • TH400 (3L80), AT-540

Sonnax stator cap GM-WP12-OE is a thrust washer molded from a high performance phenolic resin, making it a significant upgrade compared to the OE thrust washer. Th...Read More

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BorgWarner 310mm NLU, Buick TH350, TH400 (3L80), AT-540 Stator Cap GM-WP12-OE

Impeller Hub GM-90-6G

  • Buick TH350
  • Chevy TH350
  • Powerglide
  • TH400 (3L80), AT-540

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Buick TH350, Chevy TH350, Powerglide, TH400 (3L80), AT-540 Impeller Hub GM-90-6G

Thrust Washer GM-WF-156

  • 10-3/4" NLU
  • Buick TH350
  • TH400 (3L80), AT-540

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10-3/4" NLU, Buick TH350, TH400 (3L80), AT-540 Thrust Washer GM-WF-156

Thrust Washer GM-WF-188

  • 10-3/4" NLU
  • Buick TH350
  • TH400 (3L80), AT-540
This part has been discontinued.

Thrust Washer GM-WF-094

  • 10-3/4" NLU
  • Buick TH350
  • TH400 (3L80), AT-540

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10-3/4" NLU, Buick TH350, TH400 (3L80), AT-540 Thrust Washer GM-WF-094

Pinion Washer 34875-03

  • 4L80-E
  • 4L85-E
  • 4T65-E
  • TH400
  • For output and reaction planetaries

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4L80-E, 4L85-E, 4T65-E, TH400 Pinion Washer 34875-03

Actuator Feed Limit Valve Kit 77754-09K

  • 4L60-E
  • 4L65-E
  • 4L70-E

In GM 4L60-E, 4L65-E and 4L70-E units, the AFL valve is a solenoid feed regulator valve that feeds the EPC solenoid and shift solenoids. The OE AFL valve design ha...Read More

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4L60-E, 4L65-E, 4L70-E Actuator Feed Limit Valve Kit 77754-09K

Thrust Washer GM-WF-062

  • 10-3/4" NLU
  • AOD (FIOD)
  • Buick TH350
  • TH400 (3L80), AT-540

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10-3/4" NLU, AOD (FIOD), Buick TH350, TH400 (3L80), AT-540 Thrust Washer GM-WF-062

Impeller Hub GM-90-5G

  • 298mm LU (TH250C, TH350C, 200-4R, 4L60 & E)
  • TH400 (3L80), AT-540

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298mm LU (TH250C, TH350C, 200-4R, 4L60 & E), TH400 (3L80), AT-540 Impeller Hub GM-90-5G

Reinforcement Ring GM-WS-39

  • BorgWarner 310mm LU (A618, 47RH/RE, 48RE)
  • BorgWarner 310mm NLU
  • TH400 (3L80), AT-540
  • BW 310mm LU (A618) and Allison AT 540/545 units require modifications for proper fit. See instructions for details.

Sonnax turbine stiffener plate GM-WS-39 is used to create a stronger turbine in GM TH400, Allison AT 540/545, BW 310mm LU (A618) and BW 310mm NLU converters. The d...Read More

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BorgWarner 310mm LU (A618, 47RH/RE, 48RE), BorgWarner 310mm NLU, TH400 (3L80), AT-540 Reinforcement Ring GM-WS-39

Accordion Spring GM-S-4

  • 298mm LU (TH250C, TH350C, 200-4R, 4L60 & E)
  • TH125 NLU
  • TH400 (3L80), AT-540
This part has been discontinued.

Accordion Spring GM-S-4A

  • 298mm LU (TH250C, TH350C, 200-4R, 4L60 & E)
  • TH125 NLU
  • TH400 (3L80), AT-540

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298mm LU (TH250C, TH350C, 200-4R, 4L60 & E), TH125 NLU, TH400 (3L80), AT-540 Accordion Spring GM-S-4A

10" Performance Converter Kit GM-RK-1S

  • Buick TH350
  • Chevy TH350
  • Powerglide
  • Powerglide, TH350, TH400, 10" Performance Converter
  • TH400 (3L80), AT-540

Sonnax 10" performance converter kit GM-RK-1S allows builders to assemble a high performance converter with minimal effort. Fully machined cover with bushing...Read More

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Buick TH350, Chevy TH350, Powerglide, Powerglide, TH350, TH400, 10" Performance Converter, TH400 (3L80), AT-540 10" Performance Converter Kit GM-RK-1S

10" Performance Converter Kit GM-RK-7

  • Buick TH350
  • Chevy TH350
  • Powerglide
  • Powerglide, TH350, TH400, 10" Performance Converter
  • TH400 (3L80), AT-540

Sonnax 10" performance converter kit GM-RK-7 allows builders to assemble a high performance converter with minimal effort. Fully machined cover with bushing ...Read More

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Buick TH350, Chevy TH350, Powerglide, Powerglide, TH350, TH400, 10" Performance Converter, TH400 (3L80), AT-540 10" Performance Converter Kit GM-RK-7
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