This guide will help you gather the necessary details to order your custom-built driveshaft. You'll need to provide your transmission model, rear U-joint series, and pinion yoke measurements.
Important Measurement Note: Please measure to the FRONT face of the pinion yoke and do NOT subtract 1/4″. Reference Diagram N for the “X” measurement — this is exactly what we require. For complete measuring instructions, continue reading, and feel free to reach out if you need assistance.
First, identify your specific transmission model. Spline count and seal diameter typically determine the required slip yoke.
| Make | Transmission | Spline | Seal Diameter |
|---|---|---|---|
| Chrysler / Dodge | 727 | 30 Spline | 1 11/16″ |
| 904 | 26 Spline | 1 9/16″ | |
| Ford | C6-T56 | 31 Spline | 1 11/16″ |
| AOD & C4 & T5 | 28 Spline | 1 1/2″ | |
| 4R70W | 28 Spline | 1.598″ | |
| General Motors | TH350, 700R4, 4L60E | 27 Spline | 1 1/2″ |
| TH400, 4L80E | 32 Spline | 1 7/8″ |
Important note for TH400, 4L80, 4L85 and 6L80: We need to know if your 32-spline output shaft has a threaded hole in the center. Transmission slip yokes come with different U-Joint series — matching horsepower and torque to the correct U-Joint series is essential. For aftermarket transmissions, spline count and seal diameter typically determine the required slip yoke.
Identify your rear U-Joint by measuring the “Cup Diameter” and overall length. We highly recommend digital calipers — a difference of just 1/16″ can require a different joint. Hundreds of sizes exist; these four common series cover most requirements.
Diagram A — Cup Diameter (Dimension C) & Length (Dimension B)
Measure inside the tabs.
Measure flat-to-flat inside dimensions.
Measure pilot diameter and diagonal bolt-hole spacing.
Fill out the form below and we will contact you with the right fit part number.
Have your transmission, U-joint and pinion measurements? Start your custom build, or send us your numbers and we'll match the right driveshaft.
Build a Custom Driveshaft