This guide will help you gather the necessary details to order your Custom Built Driveshafts. You'll need to provide:

  • Your transmission model
  • Rear universal joint specifications
  • Length measurements
Important Measurement Note: Please measure to the FRONT face of the pinion yoke and do NOT subtract 1/4". Reference Diagram N below for the "X" measurement - this is exactly what we require. Contact us with any questions.

For complete measuring instructions, continue reading. Feel free to reach out if you need assistance..

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Step 1: Determine Your Transmission

First, you must identify your specific transmission model.

Chrysler – Dodge

727 – 30 Spline, 1 11/16″ Seal Diameter
904 – 26 Spline, 1 9/16″ Seal Diameter

Ford

C6-T56 – 31 Spline, 1 11/16″ Seal Diameter
AOD & C4 & T5 – 28 Spline, 1 1/2″ Seal Diameter
4R70W – 28 Spline, 1.598″ Seal Diameter

General Motors

TH350, 700R4, 4L60E – 27 Spline, 1 1/2″ Seal Diameter
TH400, 4L80E – 32 Spline, 1 7/8″ Seal Diameter

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.

Note: 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.

Need assistance? Contact us for help.

 
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Step 2: Determine Your Rear Universal Joint

Next, identify your rear U-Joint by measuring the "Cup Diameter" and overall length. We highly recommend using digital calipers, as differences of just 1/16" can require a different joint.

Hundreds of Universal Joint sizes exist to handle various power levels and applications. These 4 common series cover most requirements:

1310 Spicer Series:

  • 1 1/16″ Cup Diameter (Diagram A — Dimension C)
  • 3 7/32″ Length (Diagram A — Dimension B)
  • Some Ford applications use 1 1/8" diameter cups
  • Suitable horsepower: up to 500 HP for circle track, road racing, small tire drag racing, and 4×4
  • Performance Dynamic Cryo Joint available

1330 Spicer Series:

  • 1 1/16″ Cup Diameter (Diagram A — Dimension C)
  • 3 5/8″ Length (Diagram A — Dimension B)
  • Some Ford applications use 1 1/8" diameter cups
  • Stronger than 1310, common in 5.0 Mustangs
  • Performance Dynamic Cryo Joint available

3R Saginaw Series:

  • 1 1/8″ Cup Diameter (Diagram A — Dimension C)
  • 2 5/8″ Length with internal clip retention (Diagram A — Dimension B)
  • Most popular GM joint, handles up to 700 HP in road/circle track racing
  • Solid drag racing version for sportsman classes
  • Performance Dynamic Cryo Joint available

1350 Spicer Series:

  • 1 3/16″ Cup Diameter (Diagram A — Dimension C)
  • 3 5/8″ Length (Diagram A — Dimension B)
  • Built to OEM standards with Cryogenic treatment for maximum strength
  • For drag racing: solid non-greaseable design recommended for high shock loads

Measurement References:

Pinion Yoke with Retaining Tabs: Measure inside the tabs (Diagram D)

Pinion Yoke without Tabs: Measure flat-to-flat inside dimensions (Diagram E)

4-Bolt Flange Pinion: Measure pilot diameter and diagonal bolt hole spacing (Diagram L)