---
product_id: 4651957
title: "7708CB-P Chain Drive Rail Extension Kit for 8 Foot High Garage Doors"
brand: "chamberlain"
price: "$U5707"
currency: UYU
in_stock: true
reviews_count: 13
category: "Chamberlain"
url: https://www.desertcart.uy/products/4651957-7708cb-p-chain-drive-rail-extension-kit-for-8-foot
store_origin: UY
region: Uruguay
---

# 38.5-inch rail extension Quick-install setup Alloy steel chain & hardware 7708CB-P Chain Drive Rail Extension Kit for 8 Foot High Garage Doors

**Brand:** chamberlain
**Price:** $U5707
**Availability:** ✅ In Stock

## Summary

> 🚪 Upgrade your garage game with effortless 8-foot extension power!

## Quick Answers

- **What is this?** 7708CB-P Chain Drive Rail Extension Kit for 8 Foot High Garage Doors by chamberlain
- **How much does it cost?** $U5707 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/4651957-7708cb-p-chain-drive-rail-extension-kit-for-8-foot)

## Best For

- chamberlain enthusiasts

## Why This Product

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

## Key Features

- • **Effortless Quick-Install:** Includes everything you need—rail extension, replacement chain, hardware, and instructions—for a fast, hassle-free setup.
- • **Trusted Brand Reliability:** From Chamberlain, North America’s leading garage door opener manufacturer, backed by a 1-year warranty for peace of mind.
- • **Modern Keyless Convenience:** Enjoy a sleek, keyless design that integrates smoothly with your existing Chamberlain system for enhanced security and style.
- • **Seamless 8-Foot Compatibility:** Specifically engineered for 8-ft high garage doors to ensure flawless operation with Chamberlain chain drive models.
- • **Durable Alloy Steel Construction:** Built with premium alloy steel for long-lasting strength and reliable performance under daily use.

## Overview

The Chamberlain 7708CB-P Chain Drive Rail Extension Kit is a precision-engineered solution designed to extend the rail of Chamberlain chain drive garage door openers for 8-foot high doors. Crafted from durable alloy steel, this kit includes a 38.5-inch rail extension, replacement chain, all necessary hardware, and an easy-to-follow instruction manual. Trusted by professionals and backed by a 1-year warranty, it ensures reliable, everyday performance and quick installation, making it the essential upgrade for modern garage door systems.

## Description

Product Description The Chain Drive Rail Extension Kit for 8'-High Garage Doors is required for reliable, everyday operation of Chamberlain chain drive models in 8-ft. garage door applications. Featuring a quick-install extension rail and replacement chain, the kit includes everything needed for quick and easy installation.Includes one-year warranty, rail extension, replacement chain, all necessary hardware and an instruction manual for easy setup. From the Manufacturer Chamberlain 7708CB 8-Foot Chain Drive Extension Kit

Review: Works great but a shame to trash chain that was purchased in the box - Easy addon if your garage is an 8 FOOT GARAGE. Parts inside this box fit perfect to the parts in the garage door box. It is a SHAME that I had to throw away the chain that came with the garage door opener. Seems like a waste. Not a friendly green option. CHAMBERLAIN should have a free return option and maybe even a small credit. No where is it obvious that you need this kit if you garage is an 8 foot garage door. Stumbled onto it when reading the comments from previous desertcartians who purchased the garage door itself.
Review: Awesome - Thank you

## Features

- Fully compatible: the Chain Drive Rail Extension Kit for 8'-High Garage Doors is required for reliable, everyday operation of Chamberlain chain drive models in 8-ft. garage door applications..Note: Measure your door's backset, cross bore and thickness to ensure you find the right fit.
- Easy Setup: featuring a quick-install extension rail and replacement chain, the kit includes all necessary hardware and instructions for a quick and easy installation.
- Includes one-year warranty, rail extension, replacement chain, all necessary hardware and an instruction manual for easy setup.
- Proven quality: rigorous quality testing ensures lasting performance.
- About Chamberlain: the largest and most dependable garage door opener manufacturer in North America.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000H6KC9G |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #97,347 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #85 in Garage Door Opener System Parts |
| Brand | CHAMBERLAIN |
| Certification | not_applicable |
| Color | Other |
| Control Method | App |
| Controller Type | Hand Control |
| Customer Reviews | 4.5 4.5 out of 5 stars (667) |
| Date First Available | January 1, 2008 |
| Finish | Unfinished |
| Finish Type | Unfinished |
| Global Trade Identification Number | 00012381180011 |
| Included Components | Rail extension, replacement chain, all necessary hardware, instruction manual |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 4.8 pounds |
| Item dimensions L x W x H | 38.5 x 3 x 2 inches |
| Item model number | 7708CB |
| Lock Type | Digital Lock or Electromechanical Lock |
| Manufacturer | Chamberlain |
| Material | Alloy Steel |
| Measurement System | Metric |
| Model Name | Chamberlain 7708CB-P Chain Drive Rail Extension Kit for 8 Foot High Garage Doors |
| Number of Pieces | 1 |
| Part Number | 7708CB |
| Product Dimensions | 38.5 x 3 x 2 inches |
| Recommended Uses For Product | Extending the rail of Chamberlain chain drive garage door openers in 8-ft. high garage doors |
| Shape | Rectangular |
| Size | Regular |
| Special Feature | Keyless |
| Special Features | Keyless |
| Style | Modern |
| UPC | 012381180011 |
| Warranty Description | 1 Year |

## Product Details

- **Brand:** CHAMBERLAIN
- **Item dimensions L x W x H:** 38.5 x 3 x 2 inches
- **Lock Type:** Digital Lock or Electromechanical Lock
- **Material:** Alloy Steel
- **Special Feature:** Keyless

## Images

![7708CB-P Chain Drive Rail Extension Kit for 8 Foot High Garage Doors - Image 1](https://m.media-amazon.com/images/I/61091mgV-7L.jpg)

## Questions & Answers

**Q: Can I use my old chain drive rail extensions from genie brand?**
A: Thank you for your inquiry. Unfortunately, the old rail extensions, from your Genie opener, will not work with our Chamberlain brand garage door openers. If you need further assistance, please visit us at support.chamberlaingroup.com

**Q: Does this fit the chamberlin c2102 garage door opener?**
A: Thank you for your inquiry. The 7708CB-P, chain drive rail extension kit, will work on a C2102, for an 8-ft. garage door application.

**Q: Will this work on craftsman 9.53930DM**
A: Yes, this will work as an extension for your Craftsman Chain Drive.

**Q: Is this 7708cb-p equvilent to the craftsman 53728 ?**
A: No, the 7708CB-P is a chain drive extension kit, and the 53728 is for a belt drive extension kit. Thank you!

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great but a shame to trash chain that was purchased in the box
*by G***M on April 5, 2025*

Easy addon if your garage is an 8 FOOT GARAGE. Parts inside this box fit perfect to the parts in the garage door box. It is a SHAME that I had to throw away the chain that came with the garage door opener. Seems like a waste. Not a friendly green option. CHAMBERLAIN should have a free return option and maybe even a small credit. No where is it obvious that you need this kit if you garage is an 8 foot garage door. Stumbled onto it when reading the comments from previous Amazonians who purchased the garage door itself.

### ⭐⭐⭐⭐⭐ Awesome
*by A***R on October 28, 2025*

Thank you

### ⭐⭐⭐⭐ Worked great!
*by P***P on November 2, 2024*

I have to wonder why the company does not sell a 7 ft. model and an 8 ft. model. Lots of extra parts were purchased just to get the extension. Anyone need a brand new in the box chain for a seven-foot door? Just a waste of resources.

## Frequently Bought Together

- Chamberlain 7708CB-P Chain Drive Rail Extension Kit for 8 Foot High Garage Doors
- Chamberlain C2405 MYQ Smart Garage Door Opener, Chain Drive, 1/2-HP Motor, Dual Light - Quantity 1
- Decko 24999 Universal Garage Door Opener Hanging/Installation Kit Gray

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*Product available on Desertcart Uruguay*
*Store origin: UY*
*Last updated: 2026-02-25*