Speedmaster®
GM 4L80 Stock Spline Automatic Transmission 300M Input Shaft [34670-01]
![Speedmaster® PCE602.1009 GM 4L80 Stock Spline Automatic Transmission 300M Input Shaft [34670-01]](https://product-arena.s3-us-west-1.amazonaws.com/ProcompElectronics/PCE602%20-%20Automatic%20Transmission%20Input%20Shafts/PCE602.1009/PCE602.1009.jpg?resizeid=224&resizeh=600&resizew=600)
![Speedmaster® PCE602.1009 GM 4L80 Stock Spline Automatic Transmission 300M Input Shaft [34670-01]](https://product-arena.s3-us-west-1.amazonaws.com/ProcompElectronics/PCE602%20-%20Automatic%20Transmission%20Input%20Shafts/PCE602.1009/PCE602.1009_A.jpg?resizeid=224&resizeh=600&resizew=600)
![Speedmaster® PCE602.1009 GM 4L80 Stock Spline Automatic Transmission 300M Input Shaft [34670-01]](https://product-arena.s3-us-west-1.amazonaws.com/ProcompElectronics/PCE602%20-%20Automatic%20Transmission%20Input%20Shafts/PCE602.1009/PCE602.1009_D.jpg?resizeid=224&resizeh=600&resizew=600)
![Speedmaster® PCE602.1009 GM 4L80 Stock Spline Automatic Transmission 300M Input Shaft [34670-01]](https://product-arena.s3-us-west-1.amazonaws.com/ProcompElectronics/PCE602%20-%20Automatic%20Transmission%20Input%20Shafts/PCE602.1009/PCE602.1009_E.jpg?resizeid=224&resizeh=600&resizew=600)
Product Information
Overview
High-horsepower and hard launches can cause tremendous stresses on the internal transmission components. Speedmaster automatic transmission input shafts can withstand the stresses and the added power.
Specs
| Brand: | Speedmaster |
| Part Number: | PCE602.1009 |
| Part Type: | Automatic Transmission Input Shaft |
| Input Shaft Material: | Vacuum Melted 300 Steel |
| Input Shaft Length (in.): | 13.500 in. |
| Transmission Make: | GM |
| Transmission Model: | 4L80E |
| Carrier Type: | Stock |
| Input Spline Type: | Stock |
| HP Rating: | up to 1,200 HP |
| Quantity: | Sold Individually |
Warranty Information
12-Month Limited Worldwide Warranty
Prop 65 Warning
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Installation Guide
Our AI assistant generates a step-by-step guide for this product — covering installation, maintenance, and troubleshooting.
This AI-generated guide is for general reference only and does not constitute official Speedmaster product documentation. Always verify fitment, torque specifications, and safety requirements before installation.