Trail-Gear FJ80 ABS Tone Ring for Longfield 30-Spline Birfield – Toyota Land Cruiser 80 Series

The Trail-Gear FJ80 ABS Tone Ring is a replacement ABS reluctor / tone ring designed to allow the Longfield FJ80 Gun-Drilled 30-Spline Birfield & Axle Super Set to be used on ABS-equipped Toyota Land Cruiser FJ80 and Lexus LX450 applications.

Sold individually, this tone ring is specifically listed by Trail-Gear for use with the Longfield 30-Spline Super Set, part number 301720-1-KIT.

If you are installing or servicing the Longfield 30-spline front axle conversion on an ABS-equipped FJ80, this ring provides the toothed ABS reference required by the vehicle's wheel-speed sensing system.

Important: This standalone replacement tone ring is listed by Trail-Gear specifically for the Longfield FJ80 30-Spline Super Set. It should not be ordered as a replacement tone ring for the Longfield 24-spline kit.

Designed for the Longfield FJ80 30-Spline Super Set

Trail-Gear specifically states that the FJ80 ABS Tone Ring allows the Longfield FJ80 Gun-Drilled 30-Spline Super Set, P/N 301720-1-KIT, to be installed on an FJ80 equipped with ABS.

For the complete axle and Birfield upgrade, see:

Longfield 30-Spline Gun-Drilled Birfield & Axle Kit for Toyota Land Cruiser 80 Series – 301720-1-KIT

The complete Longfield 30-spline kit upgrades the Birfield-to-inner-axle interface to 30 splines and includes heavy-duty 4340 chromoly axle shafts and gun-drilled Longfield Birfields.

Vehicle Compatibility

1990–1993 FJ80 note: models using the short factory drive flanges require the taller Toyota drive flanges P/N 43421-60040 if the original OEM grease caps are to be reused.

ABS Tone Ring Function

The ABS tone ring is a toothed reluctor ring used by the ABS wheel-speed sensor to determine wheel rotational speed.

As the ring rotates with the axle / Birfield assembly, its teeth pass the ABS sensor and generate the repeating signal used by the ABS control system.

A damaged, missing or incorrectly fitted tone ring can prevent the ABS from receiving a correct wheel-speed signal and may result in an ABS warning or malfunction.

30-Spline Longfield Application

This replacement ring is particularly relevant when:

• Installing the Longfield FJ80 30-Spline Super Set on an ABS-equipped vehicle
• Replacing a damaged ABS tone ring
• Servicing a Longfield 30-spline Birfield installation
• Replacing a ring damaged during axle or Birfield disassembly
• Rebuilding an FJ80 front axle fitted with Longfield 30-spline components

Important 24-Spline Compatibility Note

This standalone Trail-Gear tone ring should be treated as a 30-spline Longfield application.

Trail-Gear's product page specifically identifies Longfield 30-Spline Super Set 301720-1-KIT as the intended Longfield application for this individual tone ring.

The separate Longfield 24-Spline Super Set is supplied with its own FJ80 ABS tone rings. Therefore, this standalone product should not be sold or selected as a replacement tone ring for the 24-spline Longfield kit unless compatibility has first been confirmed directly with Trail-Gear.

Technical Specifications

Sold Individually

This product contains one ABS tone ring.

If both front Birfields require new ABS tone rings, order:

Quantity 2

The complete Longfield 30-Spline Super Set may already include the required tone rings, so check the contents of your existing kit before ordering additional rings.

Longfield 30-Spline FJ80 Front Axle Upgrade

The ABS tone ring is designed to support the ABS functionality of the Longfield FJ80 30-Spline Gun-Drilled Birfield & Axle Super Set.

The 30-spline Longfield kit includes:

• 2 × Longfield FJ80 Gun-Drilled 30-Spline Birfield Joints
• 2 × Longfield 4340 Chromoly Front Axle Shafts
• FJ80 ABS Tone Rings
• Extended Drive-Flange Dust Caps

The 30-spline Super Set upgrades the factory-style 24-spline Birfield-to-inner-axle connection to a stronger 30-spline interface while retaining the correct FJ80 hub and differential-side arrangement.

1990–1993 FJ80 Drive Flange Note

Some early 1990–1993 Toyota Land Cruiser FJ80 models use short drive flanges.

Trail-Gear specifies that these vehicles require the taller Toyota drive flange:

Toyota P/N 43421-60040

if the original Toyota grease caps are to be reused with the Longfield installation.

This drive-flange requirement is separate from the ABS tone ring itself but is important when installing the complete Longfield Birfield system on early FJ80 vehicles.

Installation

Correct ABS tone-ring installation is important because the ring must run concentrically and at the correct position relative to the ABS wheel-speed sensor.

• Inspect the tone ring before installation for damage
• Ensure the Birfield mounting surface is clean
• Install the ring squarely and evenly
• Do not damage or distort the tone-ring teeth
• Check the ABS sensor and wiring while the axle is dismantled
• Confirm correct sensor clearance after assembly
• Check that the ring does not contact the sensor during rotation
• Professional installation is recommended where appropriate

What’s Included

• 1 × Trail-Gear FJ80 ABS Tone Ring

Warranty

Trail-Gear states that this product carries its 12-Month Limited Warranty.

The warranty applies to the original purchaser and is non-transferable, subject to Trail-Gear's warranty terms, exclusions and claim procedures.

Frequently Asked Questions

Q1: What is the Trail-Gear FJ80 ABS Tone Ring used for?
A: It allows the Longfield FJ80 Gun-Drilled 30-Spline Super Set to operate with the ABS on compatible FJ80 and LX450 applications.

Q2: Which Longfield kit is this tone ring intended for?
A: Trail-Gear specifically lists it for the Longfield FJ80 Gun-Drilled 30-Spline Super Set, part number 301720-1-KIT.

Q3: Is it compatible with the Longfield 24-spline kit?
A: This standalone ring is listed by Trail-Gear specifically for the 30-spline Super Set. The 24-spline Super Set is supplied with its own ABS tone rings, so this individual product should not be selected as a replacement for the 24-spline kit unless compatibility is separately confirmed by Trail-Gear.

Q4: Does it fit the Toyota Land Cruiser FJ80?
A: Yes. Trail-Gear lists Toyota Land Cruiser FJ80 models from 1990–1997.

Q5: Does it fit the Lexus LX450?
A: Yes. Trail-Gear lists the Lexus LX450 from 1995–1997.

Q6: Is this for ABS-equipped vehicles?
A: Yes. Its purpose is to provide the ABS tone-ring signal required when using the compatible Longfield 30-spline Birfield installation.

Q7: Is the tone ring sold individually?
A: Yes. Part number 303249-1 is sold as one individual ABS tone ring.

Q8: Do I need one or two?
A: One ring is required per applicable Birfield. If both front sides require replacement rings, order two.

Q9: Are tone rings included with the complete Longfield 30-Spline Super Set?
A: The complete Longfield FJ80 30-Spline Super Set includes the required FJ80 ABS tone rings, so additional rings are normally required only for replacement or service purposes.

Q10: Does it work with a 1990–1993 FJ80?
A: The FJ80 application includes 1990–1993 models, but early vehicles with short drive flanges have an additional drive-flange consideration when installing Longfield Birfields.

Q11: What is different on 1990–1993 FJ80 models?
A: Some early vehicles use short drive flanges. Trail-Gear states that taller Toyota drive flanges P/N 43421-60040 are required if the OEM grease caps are to be reused.

Q12: What is an ABS tone ring?
A: It is a toothed reluctor ring that rotates past the ABS wheel-speed sensor, allowing the ABS to measure wheel rotational speed.

Q13: Can a damaged ABS tone ring cause an ABS warning?
A: A damaged, missing, or incorrectly positioned reluctor ring can prevent the wheel-speed sensor from receiving the expected signal and may cause ABS faults.

Q14: Can I buy the complete Longfield 30-spline kit from OFM4x4?
A: Yes. See the Longfield 30-Spline Gun-Drilled Birfield & Axle Kit for Toyota Land Cruiser 80 Series.

Q15: What is included with this product?
A: One Trail-Gear FJ80 ABS Tone Ring, part number 303249-1.

Why Buy from OFM4x4.CO.UK

• Genuine Trail-Gear and Longfield drivetrain components
• Replacement components for Longfield FJ80 30-spline axle systems
• Complete Longfield 30-spline Birfield & axle kits available
• Specialists in Toyota Land Cruiser drivetrain upgrades
• Technical assistance with FJ80 axle and Birfield compatibility
• Supporting differential and axle components available
• UK-based customer service