Torsion Bar Set - Jaguar E-Type - .825 x 32.312"
SKU 4720-825
Category: Jaguar E-Type Performance Torsion Bars (Grand Touring Plus Spec)
The 4720-825 is a premium front torsion bar upgrade engineered specifically for the iconic Jaguar E-Type (applicable to all Series platforms running the longitudinal front torsion layout). Stepping up to a 0.825" diameter, this solid alloy steel set represents the ultimate "Grand Touring Plus Spec." It balances the line between aggressive street handling and vintage race compliance, significantly flattening body roll through hard corners and stopping nose-dive under heavy braking, while remaining forgiving enough for cross-country rallies.
Performance & Fitment
Application: Jaguar E-Type (Series 1, 2, and 3 variants utilizing the standard factory longitudinal length).
Diameter: 0.825". A high-performance intermediate upgrade, optimized for drivers who want modern cornering control, precise steering feedback, and minimal body sway during high-speed touring or track-day events.
Length: 32.312" (Exact factory dimensional replacement).
Design: Solid, single-piece alloy construction engineered for maximum torsional strength and resistance to structural sag.
Premium Construction
Material: Heat-Treated 4340 Aircraft-Grade Alloy Steel. Forged from premium racing-grade steel designed to handle continuous structural twisting without sagging or losing its spring memory over time.
Manufacturing Process: Centerless Ground. The outer body of the shaft is ground to a mirror finish, maintaining absolute diameter consistency. This precision removing of all microscopic surface imperfections eliminates potential "stress risers" where fractures typically form under load.
Coating: Heavy-Duty Powder Coating. Seals the raw steel against road moisture, engine oil leaks, and road salt, ensuring long-term protection against corrosive pitting.
🇬🇧 Classic Jaguar Suspension Tech & Installation Notes
Upgrading the longitudinal torsion bars on an E-Type requires strict attention to factory positioning and mechanical tension to ensure safe installation and perfect alignment:
⚠️ Caution: High-Tension Energy: Torsion bars store an immense amount of mechanical energy. Before loosening or attempting to remove the factory bars, you must use an E-Type torsion bar unloading tool or safely support the lower wishbone assembly to completely relieve the tension. Attempting to force a loaded bar out can cause catastrophic personal injury and permanently distort the chassis anchorage points.
❌ The Spline Indexing System: Jaguar engineered the front and rear splines of the E-Type torsion bars with a different number of teeth (fine vernier adjustment). This allows you to fine-tune the front ride height. Rotating the bar a single notch in the lower wishbone vs. one notch in the rear chassis reaction plate changes the front trim height by minute fractions of an inch, making it easy to level the front end perfectly.
❌ Spline Sockets Cleanout: Over decades, the splined sockets inside the front lower wishbones and the rear reaction plate gather road grime, hardened grease, and surface rust. Before sliding the new 0.825" bars into place, thoroughly clean out these internal receivers with a wire brush and a premium penetrating solvent. Forcing a new bar into a clogged socket can easily strip the splines.
❌ Anti-Seize and Lubrication: Always apply a generous coat of heavy-duty, waterproof anti-seize or a moly-based grease to both splined ends before installation. Because these splines must allow for slight movement as the lower control arm moves through its suspension arc, running them dry will cause severe squeaking, internal corrosion, and eventual seizure.
❌ Maintain Left & Right Orientation: Torsion bars are directional. They are structurally pre-stressed in a specific direction during manufacturing or take a permanent "set" based on the rotational torque of supporting the car. Ensure you inspect the bar ends for Left (Passenger side on LHD) and Right (Driver side on LHD) stamps. Swapping their sides will force the metal grain to untwist against its set, causing rapid ride height sag or premature bar failure.
What’s Included
(1) Pair of Solid Torsion Bars for Jaguar E-Type
Warranty
Backed by a 1-year warranty for peace of mind.
Stock Information
Available on backorder.