Sonnax

Low/Reverse Sprag Rebuild Kit 104642-80SK

6L80

In GM 6L80 transmissions, the low/reverse sprag elements, end caps and retainer plates are prone to wear, while the race is often unaffected. This results in a bin...Read More

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6L80 Low/Reverse Sprag Rebuild Kit 104642-80SK

Pressure Switch Rebuild Kit 124740-70K

6L45
6L50
6L80
6L90
6T70 (Gen. 1)
6T75 (Gen. 1)

Listed GM 6-speed transmissions often set various trouble codes related to failures of fluid pressure switches that are internal to the transmission electro-hydrau...Read More

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6L45, 6L50, 6L80, 6L90, 6T70 (Gen. 1), 6T75 (Gen. 1) Pressure Switch Rebuild Kit 124740-70K

Planetary Rebuild Kit 34880RK

4L80-E
4L85-E
Output & reaction planetaries, 1999 & Later

This part has been discontinued.

The Sure Cure® Kit SC-6L80-6L90

6L80
6L90

Sonnax Sure Cure kit SC-6L80-6L90 for GM 6L80 and 6L90 units is a comprehensive reconditioning package featuring the best Sonnax products developed to help rebuild...Read More

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6L80, 6L90 The Sure Cure® Kit SC-6L80-6L90

Zip Kit® 6L45-6L90-ZIP

6L45
6L50
6L80
6L90

Sonnax Zip Kit 6L45-6L90-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in the GM 6L45/50/80/90 valve body. The ...Read More

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6L45, 6L50, 6L80, 6L90 Zip Kit® 6L45-6L90-ZIP

Pressure Switch Rebuild Installation Tool Kit 124740-TL70

6L45
6L50
6L80
6L90
6T70 (Gen. 1)
6T75 (Gen. 1)

Tool kit for 124740-70K.

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6L45, 6L50, 6L80, 6L90, 6T70 (Gen. 1), 6T75 (Gen. 1) Pressure Switch Rebuild Installation Tool Kit 124740-TL70

Pressure Switch Installation Tool Kit 124740-TL30

6L45
6L50
6L80
6L90
6T70 (Gen. 1)
6T75 (Gen. 1)
Tool kit 124740-TL30 has been discontinued and replaced by 124740-TL70.

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

Pressure Switch Rebuild Kit 124740-30K

6L45
6L50
6L80
6L90
6T70 (Gen. 1)
6T75 (Gen. 1)
Kit 124740-30K is discontinued and replaced by 124740-70K.

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

Pressure Switch Rebuild Master Pack 124740-28K

6L45
6L50
6L80
6L90
6T70 (Gen. 1)
6T75 (Gen. 1)
Kit 124740-28K is discontinued and replaced by 124740-70K and 124740-TL70.

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

November 05, 2021

Transmission Report Newsletter: November 2021

Featured in this Issue:Rostra Joins Sonnax Transmission CompanyNew Work/Sport Performance UpgradesGM 8L45, 8L90 Valve Body RepairsGM 6L45/50, 6L80/90 BushingsNew Pressure Switch Rebuild Options for GM 6-Speed TEHCMs

March 31, 2020

Transmission Report Newsletter: April 2020

Featured in this issue:

6L80/90 Transmission Tech Advisory: Consider an Updated Converter
Sonnax Hauls in Top Products & Tools!
Gen. 3 6T40 Units: What’s Changed & What’s Stayed the Same
Big Units Don’t Have to Mean Big Costs with AS66/69RC Valve Kits
Quickly & Easily Repair the Chrysler Solenoid Switch Valve
Conquering the GM Compensator Clip Conundrum

July 24, 2018

Transmission Report Newsletter: July 2018

Featured in this issue:Introducing Premium GM 6-Speed Remanufactured Valve BodiesProduct Development Takes the Spotlight at TASC MeetingMeet Sonnax's New PresidentGreat New Upgrades for AS68RC, 68RFE & 5R110W

March 09, 2016

Transmission Report Newsletter: March 2016

Featured in this issue:U341E/F TCC Slip DiagnosisFord 6R140 Zip Kit®U341E/F Valve Body Repairs6L80/90 Performance UpgradesTransmission Digest Top 10 Winners4L60/E Performance Catalog, Vol. 3

April 22, 2024

Transmission Report Newsletter: April 2024

New products featured in this issue:RFE TCC Apply Limit Switch Valve KitsZF8HP45/50/51 & Chrysler 845RE, 850RE Heavy-Duty “A” Clutch Backing Plate48RE Zip Kit®Damper & Accumulator Piston Kits4L60/E & TH400 Input Shaft Upgrades

September 03, 2013

Transmission Report Newsletter: August 2013

Featured in this issue:Genuine SonnaxVacuum Testing GuidesGM6L45-6L90 SolutionsNew Transmission KitsReamer Care

March 07, 2014

Transmission Report Newsletter: March 2014

Featured in this issue:The Right Kit for the Rebuild is a Genuine Sonnax KitThe Sure Cure Tech TipNew & Improved Vacuum Test Guides4R70W Forward Clutch Drum

September 17, 2021

GM 6L45, 6L50, 6L80, 6L90 Valve Body Layout

Smart-Tech® Converter Clutch Kit FD-CP-20K

6R140

Captive clutch failure in the Ford 6R140 is a chronic problem that is difficult to address with stock components or traditional methods. Key OE parts are not avail...Read More

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