Speedmaster®
Ford C4 Automatic Transmission 0.839" 26 / 26 Spline Billet Steel 300M Input Shaft
Product Information
Overview
Our Input Shafts are constructed from hardened, aircraft quality high strength steel. They feature increased lubrication flow and strength with a resized diameter that provides optimum stress distribution along the entire length of shaft and along the extended high gear splines to the oil ring.
Specs
| Brand: | Speedmaster |
| Part Number: | PCE602.1002 |
| Part Type: | Automatic Transmission Input Shaft |
| Input Shaft Material: | 4340 forged steel |
| Quantity: | Sold individually. |
| Notes: | Fits 26/26-spline input. This shaft is very rare, only being produced 1 year. So please double check before purchase. |
Description
The early model C4 (1964–1969) used a .788-inch 24-spline input shaft, which was upgraded in 1970 to 26-spline and .839-inch. The upgrade also included a matching clutch hub of 26-spline. In 1971, Ford went to a .839-inch 26/24-spline input shaft, meaning the torque-converter side is 26-spline and the clutch hub is 24-spline.
Models:
PCE602.1003 - 24/24 spline 0.788-inch : 1964–1969 C4, C5, C6, C7, C8, C9
PCE602.1002 - 26/26 spline 0.839-inch : 1970–1970 D0
PCE602.1001 - 26/24 spline 0.839-inch : 1971–1979 D1, D2, D3, D4, D5, D6, D7, D8, D9
PCE602.1008 - Early to Late Converter: 26 spline 0.839-inch to 24 spline 0.788-inch
Models:
PCE602.1003 - 24/24 spline 0.788-inch : 1964–1969 C4, C5, C6, C7, C8, C9
PCE602.1002 - 26/26 spline 0.839-inch : 1970–1970 D0
PCE602.1001 - 26/24 spline 0.839-inch : 1971–1979 D1, D2, D3, D4, D5, D6, D7, D8, D9
PCE602.1008 - Early to Late Converter: 26 spline 0.839-inch to 24 spline 0.788-inch
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.