Torsion Bar Set - E Type Jaguar - .835 Diameter By 32.312 Long
SKU 4720-835
Category: Jaguar E-Type Performance Torsion Bars (Competition / Track Spec)
The 4720-835 is an elite 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 an aggressive 0.835" diameter, this solid alloy steel set represents the ultimate "Competition / Track Spec." It delivers a massive increase in spring rate over the soft factory bars, making it the premier choice for vintage racing, track days, and heavily modified E-Types that require maximum front-end roll stiffness, razor-sharp steering response, and complete elimination of nose-dive under hard braking.
Performance & Fitment
Application: Jaguar E-Type (Series 1, 2, and 3 variants utilizing the standard factory longitudinal length).
Diameter: 0.835". A race-oriented upgrade optimized for high-load cornering control, precise steering feedback, and minimal body sway under extreme track conditions.
Length: 32.312" (Exact factory dimensional replacement).
Design: Solid, single-piece alloy construction engineered for maximum torsional strength and resistance to structural sag under demanding competitive loads.
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 removes all microscopic surface imperfections, eliminating potential "stress risers" where fractures typically form under load.
Coating: Heavy-Duty Powder Coating. Seals the raw steel against road moisture, track debris, and engine oil leaks, 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 and corner-balance the front end perfectly for the track.
❌ 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 0.835" 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 under race conditions.
What’s Included
(1) Pair of Solid Torsion Bars for E-Type Jaguar
Warranty
Backed by a 1-year warranty for peace of mind.
Stock Information
3 in stock (can be backordered).