Save Now on Select Restoration Parts & Supplies!

Make/Model Search
Make/Engine Search

Brands
Savings Central
Contact Us
Help Center

My Garage
Wish List
Order Status & Returns

Welcome
My Account

Order Status

Wish List
Savings Central
Shop by Brand
Shop Your Passion
- Shop Your Passion
- Truck / SUV
  
  Jeep®
  
  Restoration
  
  Stock Replacement
  
  Late Model Muscle
  
  Tools
  
  Gifts, Clothing, & More
  
  Circle Track
  
  Street Rod
  
  Powersports
  
  Paint & Body
  
  Marine
  
  Jr Dragster
Gift Cards
My Garage
See Our Catalogs
News & Events
Career Opportunities
Contact Us
Help Center
New Products
Shop by Make/Model
Sign In

Search Make/Model

Search Make/Engine

Sign In

Welcome
Account Dashboard
Profile
Order Status & Returns
Buy It Again
Wish List
Rewards Program
Gift Cards & Summit Bucks
Address Book
My Garage Settings
Email Preferences
Text Notifications
My Reviews
My Questions
Catalogs
Tax Exemption
Sign In

Save Now on Select Restoration Parts & Supplies!

Weather Alert: Weather events across the U.S. are impacting shipping carrier hubs. Shipping delays are likely, and air shipping is not guaranteed to arrive on time. Thank you for your patience.

Filters

In Stock
- In Stock Items. Ships Today. (47) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- In Stock Items, Including at a Supplier. Ships In a Few Days. (58) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- All Items, Including Not In Stock (69) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Department
Part Type
- Automatic Transmission Boost Valves (15) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Rebuild Components (10) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Valve Body Replacement Components (6) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Clutch Hubs (5) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Servo Kits (5) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Accumulator Pistons (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Shift Kits (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Voltage Regulator and Rectifiers (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Power Steering Hoses and Lines (2) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Bearings and Races (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Clutch Springs (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Drums (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Show All
Brand
- Sonnax Transmission Company (51) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Rick's Motorsport Electrics (5) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Fine Lines (2) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Make/Model
Make/Engine
Price Range
Filter Options
- PowerSports (5)
- New Product (1)

Selected Filters

Filter Results by Vehicle

Loading...

Home
Product Results

Summit Bucks

Availability

- In Stock Items. Ships Today. (47) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- In Stock Items, Including at a Supplier. Ships In a Few Days. (58) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- All Items, Including Not In Stock (69) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Filters
Department
Part Type
- Automatic Transmission Boost Valves (15) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Rebuild Components (10) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Valve Body Replacement Components (6) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Clutch Hubs (5) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Servo Kits (5) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Accumulator Pistons (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Shift Kits (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Voltage Regulator and Rectifiers (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Power Steering Hoses and Lines (2) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Bearings and Races (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Clutch Springs (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Automatic Transmission Drums (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Show All
Brand
- Sonnax Transmission Company (51) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Rick's Motorsport Electrics (5) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Fine Lines (2) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Make/Model
Make/Engine
Price Range
Filter Options
- PowerSports (5)
- New Product (1)

Summit Bucks

Buy one of these qualifying items and earn more savings! Similar to gift certificates, Summit Bucks rewards you earn today can be applied to Summit Racing orders in...

Buy one of these qualifying items and earn more savings! Similar to gift certificates, Summit Bucks rewards you earn today can be applied to Summit Racing orders in the future.*

*Not redeemable for cash; cannot be used to buy gift cards.

Buy one of these qualifying items and earn more savings! Similar to gift certificates, Summit Bucks rewards you earn today can be applied to Summit Racing orders in the future.*

*Not redeemable for cash; cannot be used to buy gift cards.

Showing In Stock Items. Show All 69 Items.

Individual Parts

Part Groups

Results 1 - 25 of 58

Sonnax Clutch Hubs 34322-02K

Sonnax Clutch Hubs 34322-02K

Sonnax Clutch Hubs 34322-02K

Clutch Hub, Full, Forged, Extreme Duty, GM, 4L80E, 4L85E, TH400, TH425, Kit

Part Number: SOX-34322-02K

4.86 out of 5 stars ( 7 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Servo Piston Kits 28821-10K

Sonnax Servo Piston Kits 28821-10K

Sonnax Servo Piston Kits 28821-10K

Billet Servo, Low Gear, Billet Aluminum, Powerglide, Kit

Part Number: SOX-28821-10K

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Shift Improver Performance Packs HP-4L80E-01

Sonnax Shift Improver Performance Packs HP-4L80E-01

Sonnax Shift Improver Performance Packs HP-4L80E-01

Automatic Transmission Valve Body, GM 4L80-E, 4L85-E, Performance, Each

Part Number: SOX-HP-4L80E-01

Not Yet Reviewed

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Shift Improver Performance Packs HP-4L60E-01

Sonnax Shift Improver Performance Packs HP-4L60E-01

Sonnax Shift Improver Performance Packs HP-4L60E-01

Shift Improver Performance Pack, 4L60E, 4L65E, 4L70E, Buick, Chevy, GMC, Oldsmobile, Pontiac, Kit

Part Number: SOX-HP-4L60E-01

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Servo Piston Kits 28821-20K

Sonnax Servo Piston Kits 28821-20K

Sonnax Servo Piston Kits 28821-20K

Billet Servo, Low Gear, Billet Aluminum, Powerglide, Kit

Part Number: SOX-28821-20K

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Lube Regulated Pressure Regulator Valves 34200-14K

Sonnax Lube Regulated Pressure Regulator Valves 34200-14K

Sonnax Lube Regulated Pressure Regulator Valves 34200-14K

Automatic Transmission Rebuild Component, Pressure Regulator Valve, 4L80E, 4L85E, Each

Part Number: SOX-34200-14K

4.88 out of 5 stars ( 17 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Feed Limit Low Valve Kits 105740-54K

Sonnax Feed Limit Low Valve Kits 105740-54K

Sonnax Feed Limit Low Valve Kits 105740-54K

Feed Limit Low Valve Kit

Part Number: SOX-105740-54K

Not Yet Reviewed

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Signal Accumulator Pistons 154740-06K

Sonnax Signal Accumulator Pistons 154740-06K

Sonnax Signal Accumulator Pistons 154740-06K

Automatic Transmission Signal Accumulator Pistons, Aluminum, Chevy, GMC, Cadillac, Kit

Part Number: SOX-154740-06K

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Automatic Transmission Servo Pistons 34914-02

Sonnax Automatic Transmission Servo Pistons 34914-02

Sonnax Automatic Transmission Servo Pistons 34914-02

LOW/REVERSE SERVO PISTON

Part Number: SOX-34914-02

Not Yet Reviewed

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Clutch Hubs 34322-01

Sonnax Clutch Hubs 34322-01

Sonnax Clutch Hubs 34322-01

Clutch Hub, Full, Carbon Steel, GM, 4L80E, 4L85E, TH400, TH425, Each

Part Number: SOX-34322-01

4.2 out of 5 stars ( 5 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Adjustable Rear Servo Pin Kits 34912-01K

Sonnax Adjustable Rear Servo Pin Kits 34912-01K

Sonnax Adjustable Rear Servo Pin Kits 34912-01K

Automatic Transmission Component, Low/Reverse Band Servo Pin, Kit

Part Number: SOX-34912-01K

3.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Hydraulic Line Pressure Booster Kits 4L60E-LB1

Sonnax Hydraulic Line Pressure Booster Kits 4L60E-LB1

Sonnax Hydraulic Line Pressure Booster Kits 4L60E-LB1

Pressure Booster, Hydraulic Line, TV Boost Valve, GM, 4L60E, 4L65E, 4L70E, Early Pump, 1.907 in. Long, Kit

Part Number: SOX-4L60E-LB1

5.0 out of 5 stars ( 8 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Hydraulic Line Pressure Booster Kits 4L80E-LB1

Sonnax Hydraulic Line Pressure Booster Kits 4L80E-LB1

Sonnax Hydraulic Line Pressure Booster Kits 4L80E-LB1

Pressure Booster, Hydraulic Line, TV Boost Valve, GM, 4L80E, Kit

Part Number: SOX-4L80E-LB1

Not Yet Reviewed

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Shift Improver Performance Packs HP-4R100-01

Sonnax Shift Improver Performance Packs HP-4R100-01

Sonnax Shift Improver Performance Packs HP-4R100-01

Shift Improver Performance Pack, 4R100, Ford, Kit

Part Number: SOX-HP-4R100-01

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Automatic Transmission Servo Pistons 34914-01

Sonnax Automatic Transmission Servo Pistons 34914-01

Sonnax Automatic Transmission Servo Pistons 34914-01

Low/Reverse Servo Piston, Heavy Duty, Billet Aluminum, GM, TH400, 4L80E, Each

Part Number: SOX-34914-01

Not Yet Reviewed

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Hydraulic Line Pressure Booster Kits 400-LB1

Sonnax Hydraulic Line Pressure Booster Kits 400-LB1

Sonnax Hydraulic Line Pressure Booster Kits 400-LB1

Line Pressure Booster Kit, Hydraulic, Valve, Sleeve, Pressure Regulator Spring, O-rings, GM, TH400, Kit

Part Number: SOX-400-LB1

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Hydraulic Line Pressure Booster Kits 4L60E-LB2

Sonnax Hydraulic Line Pressure Booster Kits 4L60E-LB2

Sonnax Hydraulic Line Pressure Booster Kits 4L60E-LB2

Pressure Booster, Hydraulic Line, TV Boost Valve, GM, 4L60E, 4L65E, 4L70E, Late Pump, 1.810 in. Long, Kit

Part Number: SOX-4L60E-LB2

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Clutch Hubs 28304

Sonnax Clutch Hubs 28304

Sonnax Clutch Hubs 28304

Clutch Hub, Carbon Steel, Powerglide, Each

Part Number: SOX-28304

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Hydraulic Line Pressure Booster Kits 6L80-LB1

Sonnax Hydraulic Line Pressure Booster Kits 6L80-LB1

Sonnax Hydraulic Line Pressure Booster Kits 6L80-LB1

Pressure Booster, Hydraulic Line, TV Boost Valve, GM, 6L50, 6L80, 6L90, Kit

Part Number: SOX-6L80-LB1

Not Yet Reviewed

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Lube Regulated Pressure Regulator Valves 77917-07

Sonnax Lube Regulated Pressure Regulator Valves 77917-07

Sonnax Lube Regulated Pressure Regulator Valves 77917-07

Lube Regulated Pressure Regulator Valve, Oversized, 4L60E, 4L65E, 4L70E, Each

Part Number: SOX-77917-07

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Low/Reverse Sprag Rebuild Kits 104642-80SK

Sonnax Low/Reverse Sprag Rebuild Kits 104642-80SK

Sonnax Low/Reverse Sprag Rebuild Kits 104642-80SK

Automatic Transmission Rebuild Components, Low/Reverse Sprag Rebuild Kit, Steel, 6L80, Kit

Part Number: SOX-104642-80SK

Not Yet Reviewed

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Master Servo Piston Kits 28821-08K

Sonnax Master Servo Piston Kits 28821-08K

Sonnax Master Servo Piston Kits 28821-08K

Servo, Master Servo, Low Gear, Billet Aluminum, GM, Powerglide, Kit

Part Number: SOX-28821-08K

Not Yet Reviewed

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Hydraulic Line Pressure Booster Kits 700R4-LB1

Sonnax Hydraulic Line Pressure Booster Kits 700R4-LB1

Sonnax Hydraulic Line Pressure Booster Kits 700R4-LB1

Pressure Booster, Hydraulic Line, TV Boost Valve, GM, 200-4R, 4L60, Kit

Part Number: SOX-700R4-LB1

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Heavy-Duty Forward Drums 34554-01

Sonnax Heavy-Duty Forward Drums 34554-01

Sonnax Heavy-Duty Forward Drums 34554-01

TH400 FORWARD DRUM

Part Number: SOX-34554-01

Not Yet Reviewed

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

Sonnax Forward and Reverse Abuse Bore Plugs 77754-21

Sonnax Forward and Reverse Abuse Bore Plugs 77754-21

Sonnax Forward and Reverse Abuse Bore Plugs 77754-21

Automatic Transmission Rebuild Components, Forward and Reverse Abuse Bore Plugs, 4L60-E, 4L65-E, 4L70-E, Each

Part Number: SOX-7775421

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 1/26/2026

...Loading

Estimated Ship Date: Monday 1/26/2026

1
2
3
Next

Page 1 of 3
Next

Modal Header

Contact us with questions.

Call To Order

This is a custom order part. You can order this part by Contacting Us.

Summit Racing Speedcard. Synchrony Car Care.

Summit Racing Equipment SpeedCard

Jumpstart Your Next Project!

View Details|See if you Prequalify

Stay Updated with Emails from Summit Racing

Never miss a sale on new parts, tools, and more!

= Required

First Name

Last Name

Email Address Email required

See Our Catalogs

News & Events

News & Events Home
OnAllCylinders (blog)
Calendar of Events
New Product Releases
Summit Racing News
News You Can Use
Featured Vehicles
Media Center
Sanctioning Bodies

Help

Help Center
Return Policy
Beat-A-Price Guarantee
Payment Options
Contact Us

Social

Facebook
X/Twitter
Instagram
Pinterest
YouTube
Podcast

About Summit

Corporate History
Retail Locations

My Account

Profile
Email Preferences
Order Status & Returns
Wish List
Address Book
My Reviews
My Questions
My Garage
Sign In

Career Opportunities

More

Summit Racing Credit Card
Gift Cards
Calculators & Tools
Promo Exclusions
Become an Affiliate
Summit Racing Rewards Program
Summit Racing Equipment Protection Plan

Terms of Use | Privacy and Security | Site Accessibility
Copyright 2026 by AUTOSALES, INCORPORATED
dba Summit Racing Equipment | Trademarks

Let's Build it Together^™

Modal Header