Trail-Gear Rock Assault Fully Built Front Axle | Leaf Spring (1979-95 Pickup / 1985-95 4Runner)

Trail-Gear Rock Assault Fully Built Front Axle

For 1979–1995 Toyota Pickup and 1985–1995 Toyota 4Runner 4WD leaf-spring solid-front-axle applications and leaf-spring solid-axle conversions

Overview

The Trail-Gear Rock Assault Fully Built Front Axle is a complete, brand-new heavy-duty front axle assembly for classic Toyota 4WD builds. Each axle is assembled with upgraded 30-spline drivetrain components, heavy-duty steering hardware, upgraded brakes, and the selected differential configuration, eliminating the need to rebuild a used donor axle.

Every configuration offered uses a right-hand differential drop and is built specifically for leaf-spring applications. Choose the housing width, Toyota third-member style and gear ratio, locker, and either locking hubs or Creeper flanges.

Key Features

• Complete new axle assembly: Built hub-to-hub from new components rather than refurbished junkyard parts.
• 30-spline drivetrain: Longfield 30-spline Birfields with 30-spline chromoly axle shafts.
• Heavy-duty knuckle hardware: Fully Loaded Six-Shooter knuckle kit with chromoly spindles, Trail Safe seals, and Super Metal knuckle studs.
• Upgraded brakes: Heavy-duty front brake rotors and calipers are included in the assembled axle.
• Steering hardware included: Heavy-duty tie rod and drag link are installed as part of the assembly.
• Forged knuckle balls: 1035-steel construction for increased strength over used factory housings.
• Heavy-duty axle tubes: 5/16-inch high-strength DOM tubes engage 5/8 inch farther into the center section.
• Internal housing reinforcement: 360-degree internal tube gusset supports the axle tubes inside the center section.
• Heavy-duty center section: Press-formed 1/4-inch plate-steel shell with a 1/2-inch differential mounting surface.
• Improved ground clearance: Approximately 3/8 inch more clearance beneath the axle tubes and at least 3/4 inch more beneath the differential housing than the referenced factory-style geometry.

Vehicle Fitment

• 1979–1983 Toyota Pickup – 1st Gen – 4WD: Factory leaf-spring solid front axle.
• 1984–1985 Toyota Pickup – 2nd Gen – 4WD: Factory leaf-spring solid front axle.
• 1986–1988 Toyota Pickup – 2nd Gen – 4WD: Requires a leaf-spring solid-axle conversion.
• 1989–1995 Toyota Pickup – 3rd Gen – 4WD: Requires a leaf-spring solid-axle conversion.
• 1985 Toyota 4Runner – 1st Gen – 4WD: Factory leaf-spring solid front axle.
• 1986–1989 Toyota 4Runner – 1st Gen – 4WD: Requires a leaf-spring solid-axle conversion.
• 1990–1995 Toyota 4Runner – 2nd Gen – 4WD: Requires a leaf-spring solid-axle conversion.

Fitment Notes

• Right-hand differential drop only. Every configuration uses a right-hand differential drop.
• Leaf-spring applications only. This assembled axle is not intended for 3-link or 4-link mounting as supplied.
• Solid-axle conversion required: 1986–1995 Pickup and 1986–1995 4Runner applications require a properly configured leaf-spring solid-axle conversion.
• The fully built axle is supplied bare; additional suspension bracketry should not be welded onto the assembled axle.
• External axle gussets are not included. The housing does include an internal 360-degree tube gusset.
• To obtain the housing's full differential ground clearance, the bottom of the differential housing flange must be ground flush with the axle housing.
• Professional installation by an experienced solid-axle Toyota technician or fabrication shop is recommended.
• For builds that need additional brake-hose length after suspension or solid-axle changes, see the Trail-Gear 26 in. Extended Brake Lines.

Product Specifications

• Brand: Trail-Gear
• Product Type: Fully Built Front Axle Assembly
• Position: Front
• Drivetrain: 4WD
• Suspension Type: Leaf Spring
• Differential Drop: Right-Hand
• Axle / Birfield Spline: 30-Spline
• Housing Width Options: +3 in. / +5 in.
• Gear Ratio Options: 4.88 / 5.29
• Locker Options: Detroit / ARB / Grizzly / Zip
• Hub Options: Locking Hubs / Creeper Flanges
• Warranty: 12-month limited warranty for the original purchaser, subject to Trail-Gear warranty terms and exclusions.

Installation Requirements

• Confirm the selected axle width, Toyota third-member style, gear ratio, locker, and hub configuration before installation.
• Fill the differential with the correct gear oil before operation and follow the required ring-and-pinion break-in procedure.
• After installation, drive lightly for 20–30 minutes, then allow the differential to cool for at least two hours.
• Avoid heavy throttle and do not tow during the first 500 miles.
• Change the differential oil after the first 500 miles.

Available Configurations

• Width: +3 in. / +5 in.
• Third Member & Ratio: 4-Cyl / 4.88; 4-Cyl / 5.29; V6 / 4.88; V6 / 5.29; High-Pinion / 4.88; High-Pinion / 5.29.
• Locker & Hub: Detroit / Locking Hubs; Detroit / Creeper Flanges; ARB / Locking Hubs; ARB / Creeper Flanges; Grizzly / Locking Hubs; Grizzly / Creeper Flanges; Zip / Locking Hubs; Zip / Creeper Flanges.

Important: The “4-Cyl” and “V6” option labels describe the Toyota third-member/differential style selected for the axle. They do not identify the engine installed in the vehicle.