---
product_id: 13977033
title: "3987920 (03987920) Speedometer Driven Gear"
brand: "gm genuine parts"
price: "$1231"
currency: MXN
in_stock: true
reviews_count: 7
category: "Gm Genuine Parts"
url: https://www.desertcart.mx/products/13977033-3987920-03987920-speedometer-driven-gear
store_origin: MX
region: Mexico
---

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

**Brand:** gm genuine parts
**Price:** $1231
**Availability:** ✅ In Stock

## Summary

> ⚙️ Drive with precision, powered by genuine GM quality!

## Quick Answers

- **What is this?** 3987920 (03987920) Speedometer Driven Gear by gm genuine parts
- **How much does it cost?** $1231 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/13977033-3987920-03987920-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

- • **Lightweight & Compact:** At just 0.02 lbs and small footprint, it integrates seamlessly without bulk.
- • **Peace of Mind Warranty:** Backed by a 24-month unlimited mile limited warranty for long-term confidence.
- • **Precision Fit & Finish:** Polished tip design ensures zero fluid leaks and smooth shaft engagement.
- • **Versatile Compatibility:** Fits a wide range of transmissions including Muncie M-20, M-21, M-22, Turbo 350, 700R4, and Saginaw 3 & 4 speed.
- • **OE Certified Reliability:** Engineered and tested to GM’s rigorous standards for flawless performance.

## Overview

The GM Genuine Parts 3987920 Speedometer Driven Gear is a compact, metal-built transmission component made in the USA. Designed to meet original equipment standards, it ensures precise speedometer function and fluid-tight operation across multiple GM transmission models. Lightweight and backed by a 24-month unlimited mile warranty, it’s the trusted choice for professional-grade vehicle maintenance.

## 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 | #703,694 in Automotive ( See Top 100 in Automotive ) #50 in Automotive Replacement Automatic Drive Gear Bearings |
| Brand | GM GENUINE PARTS |
| Brand Name | GM GENUINE PARTS |
| Customer Reviews | 4.4 out of 5 stars 41 Reviews |
| Global Trade Identification Number | 00036666071382 |
| Included Components | ACDelco - Automatic Trans (Slp-1) (3987920) |
| Item Dimensions | 2.8 x 2.5 x 1.1 inches |
| Item Type Name | ACDelco - Automatic Trans (Slp-1) (3987920) |
| Item Weight | 0.02 Pounds |
| Item dimensions L x W x H | 2.8 x 2.5 x 1.1 inches |
| Manufacturer | ACDelco |
| Material | Metal |
| Material Type | Metal |
| UPC | 036666071382 |
| Unit Count | 1.0 Count |
| Warranty Description | 24 Month / Unlimited Mile Limited Warranty on parts sold on or after 04/01/18. (Parts Only) Please see ACDelco.com for more details. |

## 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

![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.mx/products/13977033-3987920-03987920-speedometer-driven-gear](https://www.desertcart.mx/products/13977033-3987920-03987920-speedometer-driven-gear)

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-03-12*