🔩 Differential Coupling Flange – Leyland L/L 2214 & Taurus (Oil Seal 71.30 mm)
📌 Component Overview
A differential coupling flange (also called diff. coup. flange) is a driveline component fitted at the rear differential output on heavy commercial trucks. It connects the differential output shaft to the propeller/driveshaft companion flange, allowing torque from the rear axle to be reliably transmitted down the driveline while supporting the differential’s lubrication and sealing system.
This specific flange is matched with a 71.30 mm internal oil seal, which fits around the flange at the differential housing to retain gear oil and keep contaminants out of the axle assembly.
⚙️ Key Specifications
| Feature | Specification |
|---|---|
| Application | Leyland L/L 2214 & Taurus commercial trucks |
| Type | Differential Coupling Flange (Round) |
| Serrations / Splines | 39 splines / teeth (serrated torque surface) |
| Plate Diameter | ~175 mm (7″) |
| No. of Bolt Holes | 8 holes (standard heavy truck pattern) |
| Bolt Size | Typically 9.50 mm bolts (15 No class) |
| Oil Seal Size | 71.30 mm — internal seal diameter / mating seal fitment |
| Approx. Flange Depth / Height | ~89 mm (plate thickness) |
| Part Reference (Catalog) | K154 — DIFF. COUP. L/L 2214 Taurus (Oil Seal 71.30 mm) |
🧰 Function in the Vehicle Drivetrain
The differential coupling flange serves multiple critical roles:
✔ Torque Transfer – It forms the mechanical link between the rear differential pinion output and the propeller shaft / companion flange, ensuring smooth and reliable power delivery to the wheels.
✔ Oil Retention – The 71.30 mm oil seal mates with this flange inside the axle housing to retain the differential lubricant, helping protect bearings and gears.
✔ Vibration & Backlash Control – The serrated (splined) interface improves torque engagement and reduces driveline vibration under load.
✔ Heavy‑Duty Fitment – Designed for 8 × 175 mm bolt patterns used on Leyland heavy trucks — robust for high torque and frequent load cycles.
🚛 Where It Fits
In the Leyland L/L 2214 / Taurus driveline assembly, the differential coupling flange sits right at the rear differential housing, after the gearbox and propeller shaft path:
Gearbox → Propeller Shaft → Differential Coupling Flange → Differential Gears → Axle Shafts → Wheels
The oil seal (71.30 mm) is usually inserted into the differential housing bore and seals against the flange to prevent leakage of gear oil while the vehicle is in motion.
📌 Quick Summary
Component: Differential Coupling Flange (Round, Serrated)
Truck Models: Leyland L/L 2214 & Taurus
Splines: 39
Plate Diameter: ~175 mm
Bolt Pattern: 8 holes
Oil Seal Fitment: 71.30 mm
Function: Connects rear differential to propeller shaft and retains lubricant
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