---
product_id: 13977033
title: "GM Genuine Parts 3987920 (03987920) Speedometer Driven Gear"
brand: "gm genuine parts"
price: "1240310₫"
currency: VND
in_stock: true
reviews_count: 10
category: "Gm Genuine Parts"
url: https://www.desertcart.vn/products/13977033-gm-genuine-parts-3987920-03987920-speedometer-driven-gear
store_origin: VN
region: Vietnam
---

# Compact 2.8x2.5x1.1 in size Durable metal construction Made in USA precision GM Genuine Parts 3987920 (03987920) Speedometer Driven Gear

**Brand:** gm genuine parts
**Price:** 1240310₫
**Availability:** ✅ In Stock

## Summary

> ⚙️ Drive with confidence, powered by genuine precision.

## Quick Answers

- **What is this?** GM Genuine Parts 3987920 (03987920) Speedometer Driven Gear by gm genuine parts
- **How much does it cost?** 1240310₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/13977033-gm-genuine-parts-3987920-03987920-speedometer-driven-gear)

## Best For

- gm genuine parts enthusiasts

## Why This Product

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

## Key Features

- • **Trusted Legacy:** A genuine GM part with a 4.4-star rating, ensuring you’re driving with authentic quality.
- • **Compact & Lightweight:** Small 2.8x2.5x1.1 inch footprint and just 0.32 oz for easy installation without bulk.
- • **OE-Backed Reliability:** Engineered and tested to GM's rigorous standards for flawless fit and function.
- • **Precision Polished Tip:** Minimizes fluid leaks with a finely polished contact point for enhanced durability.
- • **Versatile Compatibility:** Fits multiple transmissions including Muncie M-20, M-21, M-22, Turbo 350, 700R4, and Saginaw 3 & 4 speed.

## Overview

The GM Genuine Parts 3987920 Speedometer Driven Gear is a compact, metal-constructed component made in the USA, designed to meet GM's original equipment standards. It features a polished tip to prevent fluid leaks and fits a wide range of GM transmissions, delivering reliable performance backed by a trusted brand and strong customer satisfaction.

## Description

GM Genuine Parts Speedometer Driven Gears are designed, engineered, and tested to rigorous standards, and are backed by General Motors. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

Review: Best purchase by far! - This is a great product, they even went as far as polishing the tip that rides on the shaft seal so that way no fluid leaks! I'm super happy with this. I installed it in my muncie M-20 and it works for M-21 M-22, turbo 350, 700R4, saginaw 3 speed and saginaw 4 speed.
Review: Four Stars - good price,did the job

## Features

- Country Of Origin : United States
- The Package Height Of The Product Is 1.1 Inches
- The Package Length Of The Product Is 2.8 Inches
- The Package Width Of The Product Is 2.5 Inches

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0013FIKQC |
| Best Sellers Rank | #1,345,883 in Automotive ( See Top 100 in Automotive ) #113 in Automotive Replacement Automatic Drive Gear Bearings |
| Brand | GM GENUINE PARTS |
| Customer Reviews | 4.4 4.4 out of 5 stars (41) |
| Date First Available | February 1, 2008 |
| Global Trade Identification Number | 00036666071382 |
| Is Discontinued By Manufacturer | Yes |
| Item Weight | 0.32 ounces |
| Item dimensions L x W x H | 2.8 x 2.5 x 1.1 inches |
| Item model number | 3987920 |
| Manufacturer | ACDelco |
| Manufacturer Part Number | 03987920 |
| Material | Metal |
| Model | ACDelco - Automatic Trans (Slp-1) (3987920) |
| OEM Part Number | 03987920 |
| Product Dimensions | 2.8 x 2.5 x 1.1 inches |
| UPC | 036666071382 |

## Product Details

- **Brand:** GM GENUINE PARTS
- **Item Weight:** 9.07 g
- **Item dimensions L x W x H:** 2.8 x 2.5 x 1.1 inches
- **Material:** Metal
- **UPC:** 036666071382

## Images

![GM Genuine Parts 3987920 (03987920) Speedometer Driven Gear - Image 1](https://m.media-amazon.com/images/I/61NjqxVUbJL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best purchase by far!
*by D***N on September 20, 2025*

This is a great product, they even went as far as polishing the tip that rides on the shaft seal so that way no fluid leaks! I'm super happy with this. I installed it in my muncie M-20 and it works for M-21 M-22, turbo 350, 700R4, saginaw 3 speed and saginaw 4 speed.

### ⭐⭐⭐⭐ Four Stars
*by S***H on March 1, 2015*

good price,did the job

### ⭐⭐⭐⭐⭐ Great!
*by T***T on August 18, 2019*

Gear worked perfectly! Very fast shipping. A++

## Frequently Bought Together

- GM 3987920 Original Equipment Automatic Transmission Speedometer Driven Gear
- GM ACDelco 3987921 Original Equipment Automatic Transmission Speedometer Driven Gear
- ATP Automotive YA-1 Speedometer Driven Gear Housings

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**Shop now:** [https://www.desertcart.vn/products/13977033-gm-genuine-parts-3987920-03987920-speedometer-driven-gear](https://www.desertcart.vn/products/13977033-gm-genuine-parts-3987920-03987920-speedometer-driven-gear)

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-01-25*