---
product_id: 10086667
title: "Super 4th Servo"
brand: "sonnax"
price: "€ 178.76"
currency: EUR
in_stock: true
reviews_count: 8
category: "Sonnax"
url: https://www.desertcart.pt/products/10086667-super-4th-servo
store_origin: PT
region: Portugal
---

# D-ring seals Dual-piston design 40% more apply Super 4th Servo

**Brand:** sonnax
**Price:** € 178.76
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate Your Ride with Sonnax Super 4th Servo!

## Quick Answers

- **What is this?** Super 4th Servo by sonnax
- **How much does it cost?** € 178.76 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/10086667-super-4th-servo)

## Best For

- sonnax enthusiasts

## Why This Product

- Trusted sonnax brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seal the Deal:** D-ring seals ensure zero pressure loss, keeping your performance at peak levels.
- • **Unleash Unmatched Power:** Experience a 40% increase in holding strength with our patented dual-piston design.
- • **Versatile Compatibility:** Seamlessly integrates with OE, Corvette, or Sonnax 2nd Gear servo assemblies.
- • **Engineered for Excellence:** Designed for professionals who demand reliability and performance.
- • **Complete Assembly Included:** Comes with everything you need: Super Hold Servo Assembly and Steel Washer.

## Overview

The Sonnax Super 4th Servo features a patented dual-piston design that delivers 40% more apply force for enhanced holding power. Equipped with D-ring seals to prevent pressure loss, this assembly is compatible with OE, Corvette, or Sonnax 2nd Gear servo assemblies, ensuring a complete and reliable upgrade for your vehicle.

## Description

700R4 4L60 4L60E 4L65E 4L70E Transmission 4th Gear Super Hold Servo Vehicles with a 4L60 or 4L60-E family transmission often exhibit poor 3-4 shift quality and experience band failure in performance applications. The Sonnax "Super Hold" 4th Gear Servo features 40% more apply surface area for greater holding power 40% more surface area for greater holding power Billet Aluminum for super strength and durability Affects 4th gear only Can be used with OEM, Corvette or Sonnax performance 2nd gear servo assemblies Easy to install: Transmission removal is not required Excellent choice for vehicles used for highway towing Gives firmer 3-4 shift

Review: Nice improvement. Tricky install without removing trans. - I ordered this kit with the Sonnax super hold 2nd servo and the Sonnax boost valve kit. This was installed in a Caprice wagon with about 80k miles on the transmission. I installed them all at the same time, so I don't know how much of the improvement came from each of these parts. The shift improvement was noticeable to me, but definitely not harsh. My wife did not seem to notice or at least did not complain. So if you're looking for neck snapping shifts from your 4L60, you will need to do more than just these 3 parts. In vehicle installation for this and the 2nd super servo was not easy. I had to remove the trans crossmember and lower the transmission as far as it would go. I also pulled the passenger side cat. Clearance was still very tight and this was not an easy install. Installation in a transmission removed from the vehicle would have been pretty simple.
Review: Fixed my issue! - I bought this along with the Sonnax 2nd gear super hold kit. My 03 Silverado, 2nd gear was starting to slip, but 4th seemed fine. 1st thing I did was change fluid completely(wasn't too bad) and the filter with the AC Delco Dexron IV. This didn't help much. I figured I'd spend a bit more and see if these kits would work instead of a costly rebuild. They did, and the truck has a much quicker shift too. Wasn't a quick easy job, but well worth it. Hopefully it lasts a while. Machining quality is very good. These are high quality parts for sure.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BYG72M8 |
| Best Sellers Rank | #478,880 in Toys & Games ( See Top 100 in Toys & Games ) #1,082 in RC Servos |
| Brand Name | Sonnax |
| Customer Reviews | 4.8 out of 5 stars 96 Reviews |
| Item Weight | 50 Grams |
| Manufacturer | Sonnax |
| UPC | 696749965443 |

## Images

![Super 4th Servo - Image 1](https://m.media-amazon.com/images/I/41e5LjMGPTL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice improvement. Tricky install without removing trans.
*by L***T on March 3, 2018*

I ordered this kit with the Sonnax super hold 2nd servo and the Sonnax boost valve kit. This was installed in a Caprice wagon with about 80k miles on the transmission. I installed them all at the same time, so I don't know how much of the improvement came from each of these parts. The shift improvement was noticeable to me, but definitely not harsh. My wife did not seem to notice or at least did not complain. So if you're looking for neck snapping shifts from your 4L60, you will need to do more than just these 3 parts. In vehicle installation for this and the 2nd super servo was not easy. I had to remove the trans crossmember and lower the transmission as far as it would go. I also pulled the passenger side cat. Clearance was still very tight and this was not an easy install. Installation in a transmission removed from the vehicle would have been pretty simple.

### ⭐⭐⭐⭐⭐ Fixed my issue!
*by Z***6 on January 11, 2020*

I bought this along with the Sonnax 2nd gear super hold kit. My 03 Silverado, 2nd gear was starting to slip, but 4th seemed fine. 1st thing I did was change fluid completely(wasn't too bad) and the filter with the AC Delco Dexron IV. This didn't help much. I figured I'd spend a bit more and see if these kits would work instead of a costly rebuild. They did, and the truck has a much quicker shift too. Wasn't a quick easy job, but well worth it. Hopefully it lasts a while. Machining quality is very good. These are high quality parts for sure.

### ⭐⭐⭐⭐⭐ It works great, can't really tell a lot of difference in ...
*by M***R on May 24, 2016*

The servo is a high quality billet part. It works great, can't really tell a lot of difference in the shifting. I bought this because my overdrive suddenly stopped working, turned out to be my computer. I built my 4L60E with other sonnax upgrade parts, and am very happy with the way my trans shifts and performs.

## Frequently Bought Together

- Sonnax Super 4th Servo
- 4L60 4L60E 4L65E 4L70E Transmission 2nd Gear Super Hold Servo Kit Sonnax
- Sonnax HD 2-3 Shift Valve

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---

*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-03-13*