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Performance Converter Kit GM-RK-485WC

  • 4L80-E (Dual Stator)
  • 4L80-E (Early Single Stator)
  • 4L80-E (Late Single Stator)
  • 4L80-E, 4L85-E, Multi-Plate Performance Converter
  • Street/Strip applications only.

A performance torque converter is highly specialized based on the performance characteristics of the specific vehicle. And Sonnax has several levels of kits to ens...Read More

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4L80-E (Dual Stator), 4L80-E (Early Single Stator), 4L80-E (Late Single Stator), 4L80-E, 4L85-E, Multi-Plate Performance Converter Performance Converter Kit GM-RK-485WC

Performance Converter Kit GM-RK-488WC

  • 4L80-E (Dual Stator)
  • 4L80-E (Early Single Stator)
  • 4L80-E (Late Single Stator)
  • 4L80-E, 4L85-E, Multi-Plate Performance Converter
  • Street/Strip applications only. For use with GM 258mm early-style stators only.

A performance torque converter is highly specialized based on the performance characteristics of the specific vehicle. Sonnax has several levels of kits to ensure ...Read More

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4L80-E (Dual Stator), 4L80-E (Early Single Stator), 4L80-E (Late Single Stator), 4L80-E, 4L85-E, Multi-Plate Performance Converter Performance Converter Kit GM-RK-488WC

Slip Yoke T3R-3-9762HP

TH400, 4L80-E, Muncie M20, M21 & M22

This part has been discontinued.

Forward & Direct Clutch Inner Snap Ring 34577-01

  • 4L80-E
  • AT-540
  • TH400
  • Fits AT-540/543/545.

Sonnax forward and direct clutch inner snap ring 34577-01 is a direct replacement for GM 4L80-E, TH400 and Allison® AT-540 forward and direct piston return spring snap rings.

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4L80-E, AT-540, TH400 Forward & Direct Clutch Inner Snap Ring 34577-01

Performance Converter Mounting Ring Kit GM-RK-15

  • 4L80-E (Dual Stator)
  • 4L80-E (Early Single Stator)
  • 4L80-E (Late Single Stator)
  • 4L80-E, 4L85-E, Single-Plate Performance Converter (Mounting Ring)

Sonnax performance converter mounting ring kit GM-RK-15 is designed to work with both early- and late-model GM 4L80-E, 4L85-E transmissions and utilizes the GM 245...Read More

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4L80-E (Dual Stator), 4L80-E (Early Single Stator), 4L80-E (Late Single Stator), 4L80-E, 4L85-E, Single-Plate Performance Converter (Mounting Ring) Performance Converter Mounting Ring Kit GM-RK-15

Heavy Duty Clutch Retaining Ring 28124

  • 4L80-E
  • 4L85-E
  • Powerglide
  • TH400
  • Intermediate clutch backing plate

Sonnax heavy duty clutch retaining ring 28124 can be used as an upgrade for the Reverse clutch backing plate retaining ring in GM Powerglide transmissions and for ...Read More

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4L80-E, 4L85-E, Powerglide, TH400 Heavy Duty Clutch Retaining Ring 28124

Repair Plate GM-WA-40

  • 4L80-E (Late Single Stator)

On late GM 4L80-E (late single stator) converters, the inner race sometimes produces excessive wear on the stator pilot. In some cases it wears completely through ...Read More

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4L80-E (Late Single Stator) Repair Plate GM-WA-40

Pinion Roller 34821-06

  • 4L80-E
This part has been discontinued.

Impeller Hub GM-90-62G

  • 4L80-E (Late Single Stator)
This part has been discontinued.

Impeller Hub GM-90-51G

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

Mounting Pad GM-FN-2

  • TH400 (3L80), AT-540

M10-1.50 Thread

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TH400 (3L80), AT-540 Mounting Pad GM-FN-2

Impeller Hub GM-90-10G

  • TH400 (3L80), AT-540

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TH400 (3L80), AT-540 Impeller Hub GM-90-10G

Impeller Hub GM-90-10GSP

  • TH400 (3L80), AT-540

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TH400 (3L80), AT-540 Impeller Hub GM-90-10GSP

Impeller Hub GM-90-42G

  • TH400 (3L80), AT-540

Sonnax impeller hub GM-90-42G allows for the use of the large Allison bearing GM-N-13H in the TH400 converter. The hub is designed to pilot the partially enclosed ...Read More

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TH400 (3L80), AT-540 Impeller Hub GM-90-42G

Pilot GM-PI-2X

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

Pilot GM-PI-2

  • TH400 (3L80), AT-540

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TH400 (3L80), AT-540 Pilot GM-PI-2

Stator Adapter GM-WA-19

  • TH400 (3L80), AT-540

Sonnax stator adapter GM-WA-19 allows AT-540 stator to be modified for use with GM-N-8HLT bearing and GM-90-10G impeller hub.

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TH400 (3L80), AT-540 Stator Adapter GM-WA-19

Stator Adapter GM-WA-22

  • TH400 (3L80), AT-540
This part has been discontinued. Click here to see the part instructions.

Bearing Adapter GM-WA-24

  • TH400 (3L80), AT-540

Sonnax bearing adpater GM-WA-24 has 5 lugs for anti-rotation.

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TH400 (3L80), AT-540 Bearing Adapter GM-WA-24

Stator Adapter GM-WA-3

  • TH400 (3L80), AT-540
This part has been discontinued. Click here to see the part instructions.

Thrust Washer GM-WB-2

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

Stator Cap GM-WP8-OE

  • TH400 (3L80), AT-540

lugs & ribs

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TH400 (3L80), AT-540 Stator Cap GM-WP8-OE

Pinion Roller 34875-05

  • 4L80-E
  • Overdrive planetary, .855" long rollers fit '98-earlier only.

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4L80-E Pinion Roller 34875-05

Heavy Duty Input Shaft 34670-01

  • 4L80-E
  • 4L85-E

Input shaft failure is a common problem in performance and heavy duty GM 4L80-E and 4L85-E transmissions. Sonnax heavy duty input shaft 34670-01 is manufactured fr...Read More

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4L80-E, 4L85-E Heavy Duty Input Shaft 34670-01

Case Bushing 34006-SP

  • 4L80-E
  • 4L85-E
  • TH400

The OE case bushing in vehicles with a GM TH400, 4L80-E and 4L85-E transmissions tends to walk out of the housing bore. This leaves the output shaft unsupported, r...Read More

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4L80-E, 4L85-E, TH400 Case Bushing 34006-SP

Tabbed Pinion Washers 34821-08

  • 4L80-E
  • 4L85-E
This part has been discontinued.

Retaining Clip 34989-01

  • 4L80-E
  • 4L85-E
  • Rear Servo Piston. Fits ’91–’95 only.
This part has been discontinued.

Snap Ring 34994-15

  • 4L80-E
  • 4L85-E
This part has been discontinued.

Bolt 77801-01

  • 4L80-E
  • 4L85-E
This part has been discontinued.

Bearing Kit SBK-G20

  • 4L80-E
  • 4L85-E

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4L80-E, 4L85-E Bearing Kit SBK-G20
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