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Performance Fittings That Withstand Real-World Racing Stress 

Ford Ranger Mazda BT-50
In racing, driveline fittings are often the last thing people upgrade — until they fail.

Yokes, flanges and U-joints are under extreme stress at launch, under load and through every shift. If they’re not built to handle it, they won’t last.

Explore heavy-duty tailshaft parts or contact GJ Drivelines for tailored race-spec solutions.

Why Fittings Matter More Under Stress

Under race conditions, torque doesn’t just rise — it spikes. Launch control, clutch dumps, aggressive downshifts and sudden grip transitions send shockwaves through the driveline.

That shock has to go somewhere — and if your yokes or U-joints aren’t up to it, they fail. Not gradually. Immediately.
custom tailshaft Moorabbin

Common Failure Points in Track and Drag Setups

We’ve seen this too many times in:
  • Drag cars running slicks and trans brakes
  • Circuit builds with sequential gearboxes or aggressive diffs
  • Drift cars with high-angle CV movement and rapid weight transfer
The common break points:
  • Cast yokes shearing under torque load
  • Flanges cracking at the bolt holes
  • OE U-joints twisting under repeated stress cycles
Ford Ranger Mazda BT-50

What Makes a Fitting Race-Grade

  • Forged steel yokes – stronger grain structure to resist torsional load
  • High-angle U-joints – allow movement without binding under extreme articulation
  • Billet or chromoly flanges – resist cracking from heat and repeated load cycles
  • Secure tolerances – minimises slop, play and vibration under high RPM
All this isn’t just about strength — it’s about longevity over a full race season.
Don’t Let a $40 Part Ruin a $40K Build

You’ve invested in power, suspension, and tuning. Don’t hold it all together with the weakest link.

GJ Drivelines stocks and sources race-grade fittings built for drag, drift and circuit abuse. And if it doesn’t exist off the shelf, we’ll engineer the solution in-house.

Contact us to spec your driveline before it’s the part you didn’t upgrade that takes you out.

Enquire With Us today

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Identify Transmission

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
4 R 7OW – 28 Spline 1.598″ Seal Diameter

General Motors
T-350 700R4-4LLOE – 27 Spline 1 1/2″ Seal Diameter
T-400-4L80E – 32 Spline 1 7/8″ Seal Diameter

Note: Transmission slip yokes are manufactured with various U-Joint Series. It is important to match Horsepower and Torque requirements to U-Joint Series. For aftermarket transmission applications usually a spline count and seal diameter will identify slip yoke required.

Identify Rear U-Joint

diagram-d

If Pinion Yoke has Placement tabs that retain the U-Joint, measure inside tabs. See Diagram D.

diagram-e

If Pinion Yoke does not have Placement Tabs that retain U-Joint, measure from flat of yoke inside to inside. See Diagram E.

diagram-l

If 4 bolt Flange is used on pinion, measure Pilot Diameter and center to center diagonally bolt hole to bolt hole. See Diagram L.

diagram-a

Universal Joint Size. There are hundreds of U-Joint sizes or “Series” to accomodate many different applications of power and desired longevity for your automotive, 4×4 truck or auto racing requirements, these 4 series of joints cover most needs.

1310 Spicer Series: 1 1/16″ Cup Diameter (Dim C – Diagram A) 3 7/32″ length (Dim B – Diagram A) Certain Ford applications have 2 cups 1 1/8 Diameter. Appropriate horse power range is up to 500 in circle track or road racing, small tire drag racing and 4×4. Also available: Performance Dynamic Cryo Joint.

1330 Spicer Series: 1 1/16″ Cup Diameter (Dim C – Diagram A) 3 5/8″ length (Dim B – Diagram A) Certain Ford applications have 2 cups 1 1/8 Diameter. Slightly stronger than 1310, Used in 5.0 Mustangs. Also available: Performance Dynamic Cryo Joint.

3R Saginaw Series: 1 1/8″ Cup Diameter (Dim C – Diagram A) Retained with internal clip 2 5/8″ (Dim B – Diagram A). Most common GM joint. Horse power range up to 700 in road racing and circle track. Solid drag racing U-Joint can accomodate most sportsman classes. Also available: Performance Dynamic Cryo Joint.

1350 Spicer Series: Manufactured with OEM tolerances and treated with our Cryogenic Process to yeild the strongest U-Joint available. For drag racing applications a solid non-lube design U-Joint is recommended because of the tremendous initial shock load, or short duration of high torque the joint must be able to withstand.

 

Driveshaft Measurements

diagram-n

If PST is supplying you with transmission slip yoke, Pinion yoke and driveshaft yoke measure Dim W. See Diagram N.

If PST is supplying you with transmission slip yoke and driveshaft measure Dim X. See Diagram N.

2 Piece driveshafts use Dim Y + Z. See Diagram N.