The Best Place to Buy Upgraded Transmission Parts Made by Sonnax is Here

Precision International

Aftermarket

OEM

Raybestos Powertrain

Sonnax

Alto Products Corp

Steel Plates

TransGo

Superior Transmission Parts

Global Transmission Parts

View all Brands

Precision International

Aftermarket

OEM

Raybestos Powertrain

Sonnax

Alto Products Corp

Steel Plates

TransGo

Superior Transmission Parts

Global Transmission Parts

Motorcraft

Central Valve Bodies

Quality Used Hard Parts

Adapt-A-Case

AC Delco

ATSG

Torque Converters

Circle D Specialties

Reid Racing

TCS

BorgWarner

Rostra Precision Controls

Mopar

Dura-Bond

Rebuilt OEM Pumps

Fitzall

Exedy

LubeGard

Koyo

CVC

Recon Torque Converters

Federal Mogul

Hayden

Optimum Maintenance Services, LLC

Remanufactured OEM Part

Dorman

RatioTek

Atec Trans Tool

Transtec

ZF Friedrichshafen

Asin

DEUTSCH

Idemitsu

Streetside Tools

TRANSBRITE

View all Brands

Home
Sonnax

Quick view Details

Sonnax

4L80E Boost Valve Kit - Sonnax

MSRP:

Now: $134.95

Add to Cart
Quick view Details

Sonnax

4L80E End Plug (0.500'' Bore) 5-Pack
Quick view Details

Sonnax

4L80E HD Stator Suport Bushing (4-Pack)

MSRP:

Now: $24.95

Add to Cart
Quick view Details

Sonnax

4L80E Line Pressure Booster Kit by Sonnax

MSRP:

Now: $34.95

Add to Cart
Quick view Details

Sonnax

4L80E Manual Shift Shaft Kit (1995-UP)

MSRP:

Now: $42.95

Add to Cart
Quick view Details

Sonnax

4L80E Manual Valve - Sonnax
Quick view Details

Sonnax

4L80E Manual Valve Kit - Sonnax
Quick view Details

Sonnax

4L80E O-Ringed End Plug Kit (0.668'' TCC Valve Bore)
Quick view Details

Sonnax

4L80E O-Ringed End Plug Kit (OE Style) 5-Pack
Quick view Details

Sonnax

4L80E Output & Reaction Planetary Rebuild Kit (1999-UP)

MSRP:

Now: $69.95

Currently Out of Stock
Quick view Details

Sonnax

4L80E Overrun Clutch Valve Kit (1997-UP) Sonnax Smart-Tech®

MSRP:

Now: $254.95

Add to Cart
Quick view Details

Sonnax

4L80E Oversized Sealing Rings (Pack of 2)

MSRP:

Now: $11.95

Add to Cart
Quick view Details

Sonnax

4L80E Pump Pressure Regulator Valve by Sonnax

MSRP:

Now: $89.95

Add to Cart
Quick view Details

Sonnax

4L80E Reverse Checkball Sleeve (1995-UP) 4-Pack
Quick view Details

Sonnax

4L80E Stator Support Bushing Sonnax (1 Bushing)

MSRP:

Now: $16.95

Add to Cart
Quick view Details

Sonnax

4L80E Sure Cure® Kit by Sonnax (Tooling Required)

MSRP:

Now: $124.95

Add to Cart
Quick view Details

Sonnax

4L80E TCC Regulator Valve Kit (1991-UP) Sonnax

MSRP:

Now: $25.95

Add to Cart
Quick view Details

Sonnax

4L80E TH400 4T65E Pinion Thrust Washer - Pre-1998 (Pack of 8)

MSRP:

Now: $10.95

Add to Cart
Quick view Details

Sonnax

4L80E TH400 Extreme Duty Forward Clutch Hub Kit

MSRP:

Now: $139.95

Add to Cart
Quick view Details

Sonnax

4L80E TH400 Extreme Duty Main Shaft

Quick view

Sonnax

4L80E Boost Valve Kit - Sonnax

Common problems in vehicles with GM 4L80-E and 4L85-E transmissions include uncontrollable line rise (upward of 500 psi), high line pressure in Reverse, broken direct clutch drums and/or broken cases...

MSRP:

Now: $134.95
Add to Cart
Quick view

Sonnax

4L80E End Plug (0.500'' Bore) 5-Pack

Specs Dia.: 0.500" Sonnax Part Number: 34994-11 Symptoms: No converter apply 1-2, 2-3, 4-5 Flares

View Details
Quick view

Sonnax

4L80E HD Stator Suport Bushing (4-Pack)

GM 4L80-E and 4L85-E units may display no converter lockup or codes 68, 39, 1870 or P0741. Imbalance of torque converter clutch apply oil through the front stator support bushing contributes to this...

MSRP:

Now: $24.95
Add to Cart
Quick view

Sonnax

4L80E Line Pressure Booster Kit by Sonnax

4L80E 4L85E Transmission Line Pressure Booster Kit Sonnax Part Number: 4L80E-LB1 Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves...

MSRP:

Now: $34.95
Add to Cart
Quick view

Sonnax

4L80E Manual Shift Shaft Kit (1995-UP)

4L80-E, 4L85-E Manual Shift Shaft KitPart No. 38511-04K 1995 & later with external neutral safety swich Long style Zinc Plated Contents Shaft Flange Nuts (2)

MSRP:

Now: $42.95
Add to Cart
Quick view

Sonnax

4L80E Manual Valve - Sonnax

4L80-E, 4L85-E Manual ValvePart No. 34994-16 The OE manual valve in GM 4L80-E and 4L85-E transmissions is prone to bending due to its length and relatively narrow spools. Once bent, the...

View Details
Quick view

Sonnax

4L80E Manual Valve Kit - Sonnax

4L80-E, 4L85-E Manual Valve KitPart No. 34994-16K The OE manual valve in GM 4L80-E and 4L85-E transmissions is prone to bending due to its length and relatively narrow spools...

View Details
Quick view

Sonnax

4L80E O-Ringed End Plug Kit (0.668'' TCC Valve Bore)

4L80-E, 4L85-E O-Ringed End Plug KitPart No. 34994-14K Fits .668" dia. bores Symptoms: No converter apply 1-2, 2-3, 4-5 Flares Contents: End Plugs (5) O-Rings (5)

View Details
Quick view

Sonnax

4L80E O-Ringed End Plug Kit (OE Style) 5-Pack

4L80-E, 4L85-E O-Ringed End Plug Kit - PACK OF 5Part No. 34200-05K TCC & PR Valves OE end plugs are designed to prevent critical pressure loss by capping the bore, while also...

View Details
Quick view

Sonnax

4L80E Output & Reaction Planetary Rebuild Kit (1999-UP)

The output and reaction planetary pinion assemblies in '99-later 4L80-E transmissions frequently wear out and must be rebuilt or replaced. New replacement assemblies can be costly and the...

MSRP:

Now: $69.95
Currently Out of Stock
Quick view

Sonnax

4L80E Overrun Clutch Valve Kit (1997-UP) Sonnax Smart-Tech®

4L80-E, 4L85-E Smart-Tech® Overrun Clutch Valve KitPart No. 34200-40K Fits 1997-UP Units Insufficient holding power in the overdrive roller clutch is the underlying cause of chronic...

MSRP:

Now: $254.95
Add to Cart
Quick view

Sonnax

4L80E Oversized Sealing Rings (Pack of 2)

Pack of 2 GM 4L80-E and 4L85-E forward drums are often replaced due to wear of the sealing ring bore caused by contact with the input shaft. Contact between shaft and drum occurs because of...

MSRP:

Now: $11.95
Add to Cart
Quick view

Sonnax

4L80E Pump Pressure Regulator Valve by Sonnax

Part No: 34200-14K The OE pressure regulator valve design prevents adequate cooler flow at low RPM and high pressure/demand conditions, which can create overheat complaints. Additionally,...

MSRP:

Now: $89.95
Add to Cart
Quick view

Sonnax

4L80E Reverse Checkball Sleeve (1995-UP) 4-Pack

4L80-E, 4L85-E Reverse Checkball SleevePart No. 34200-38 Fits units '95-later. Package Quantity: 4 Vehicles with '95-later GM 4L80-E and 4L85-E transmissions commonly exhibit wear...

View Details
Quick view

Sonnax

4L80E Stator Support Bushing Sonnax (1 Bushing)

4L80-E, 4L85-E Stator Support BushingPart No. 34016-W (You get 1 Bushing) Package Quantity: 1 GM 4L80-E and 4L85-E units may display no converter lockup or codes 68, 39, 1870 or P0741...

MSRP:

Now: $16.95
Add to Cart
Quick view

Sonnax

4L80E Sure Cure® Kit by Sonnax (Tooling Required)

4L80-E, 4L85-E The Sure Cure® KitPart No. SC-4L80E Tooling Required: 77754-TL Sonnax Sure Cure kit SC-4L80E, fully compatible with '91-later GM 4L80-E and 4L85-E units, is a...

MSRP:

Now: $124.95
Add to Cart
Quick view

Sonnax

4L80E TCC Regulator Valve Kit (1991-UP) Sonnax

4L80-E, 4L85-E TCC Regulator Valve KitPart No. 34994-01K GM vehicles equipped with 4L80-E and 4L85-E transmissions may exhibit problems such as TCC shudder, burnt converter linings, TCC...

MSRP:

Now: $25.95
Add to Cart
Quick view

Sonnax

4L80E TH400 4T65E Pinion Thrust Washer - Pre-1998 (Pack of 8)

TH400, 4L80-E, 4T65-E Pinion Thrust WasherPart No. 34875-04 For '98-earlier GM 400, 4L80-E and 4T65-E output and reaction planetaries with .750" wide pinion gears. Package...

MSRP:

Now: $10.95
Add to Cart
Quick view

Sonnax

4L80E TH400 Extreme Duty Forward Clutch Hub Kit

Sonnax extreme duty forward clutch hub kit 34322-02K is manufactured from forged 4140 steel and features nitrited and case-hardened splines to eliminate spline wear in extreme applications. Includes...

MSRP:

Now: $139.95
Add to Cart
Quick view

Sonnax

4L80E TH400 Extreme Duty Main Shaft

Main shaft failure is a common problem in extreme duty GM 400, 4L80-E and 4L85-E units. OE and aftermarket shafts simply don’t hold up in extreme horsepower applications, leading to spline...

View Details

Compare Selected

Shop by Category

Shop by Brand

Shop by Brand

Sonnax