Bilstein B8 Upper Control Arm Kit 51-304690 for Toyota 4Runner, FJ Cruiser, Lexus GX470 & GX460

These are average weights; some brands may have slightly different weights. Check the specific weight in the product page dropdown option for your desired load

Front Axle

• Standard (0–100 lb): Stock or Aluminum/light bumper, light skid plates.
• Medium (100–250 lb): Steel bumper or winch, partial skid package.
• Heavy (250–400 lb): Steel bumper + winch + full skids / dual battery.

Rear Axle

• Standard (0–200 lb): Light rack, basic gear, empty bed most of the time.
  Medium (200–400 lb): Rear bumper/tire carrier or drawer system + fridge/freezer.
• Heavy (400–700 lb): Rear bumper/tire carrier + drawers + RTT + full-time tools/water/fuel.

• Stock to 2.0 in lift: Optional. Helpful if you want maximum caster, run wider wheels/tires, or your OE arms are worn.
• 2.0 in lift kits: Recommended to recover alignment range and improve coil bucket/shock-body clearance.
• 2.5 to 3.0 in lift:Strongly recommended (often required) to achieve proper caster/camber and avoid contact at droop.

• Recover alignment range: Adds built-in caster (platform-dependent) for better straight-line stability and return-to-center.
  
• Improve clearance: Reduces risk of coil bucket or spring/shock-body contact at droop; and increases tire-to-arm clearance
  
• Maximize usable travel: A higher-angle joint prevents the UCA from being the limiting factor, allowing the suspension to utilize the full travel available from your coilovers.
  
• Strength & durability: Heavy-duty construction to withstand off-road abuse. great for high travel/harsh use; needs periodic cleaning/lube and a dust boot for road salt; can transmit more NVH.

Ball Joint Type:

• High-Angle Ball Joint (sealed): Lowest maintenance and quiet operation, articulation is usually less than a uniball and strength is excellent for street/trail.
• High-Angle Ball Joint (greasable): Lower articulation than a uniball, but very durable if greased periodically, typically quieter and more affordable.
• Uniball (spherical bearing): Maximum articulation and strength; great for high travel/harsh use; needs periodic cleaning/lube and a dust boot for road salt; can transmit more NVH.

Based on Material:

• Billet Aluminum: Very light with quality alloys and good section thickness. Less impact tolerance. Corrosion-resistant.
• Tubular Steel: A solid balance between aluminum and forged steel, robust and repairable, good impact toughness.
• Forged Steel: Heavier, maximum toughness and fatigue strength, ideal for severe duty and heavy rigs.

Adjustment Capability:

• Fixed (Non-Adjustable): Pre-engineered to add caster/camber in the arm itself. Fewer parts to slip or loosen; consistent results.
• Adjustable: Allows fine-tuning of ball-joint/uniball position for extra caster/camber range

Bushing Type:

• Metal (spherical bearing / heim): More noise/vibration, highest articulation
• Polyurethane: Moderate noise/vibration, better than rubber, not as free as spherical.
• Rubber: The Quietest and most comfortable, great for daily/light trail, lowest articulation.

• Plan Ahead: Consider current and future accessories in order to calculate your constant load.
• Estimate Total Weight: Calculate the combined added weight of all the accessories for the front & rear, respectively.
• Select your loads at Mudify.com: Choose the option that fits your total weight for the front and rear.

The lift kit height shows how much the front of your vehicle will be lifted compared to its factory height. The rear is usually lifted slightly less, this results in what’s known as “Rake”.

LIFT HEIGHT DETAILS

In the product page whenever you select a lift height or load, this text updates instantly—showing you the exact front and rear lift you'll achieve with that specific lift kit setup.

Not completely. From the factory, trucks sit higher in the rear by about 2”. Our lift kits are designed to reduce that rake to 0.5-1”, leaving a Slight Rake. That way, your truck won't lose stability, the rear won’t sag when loaded, and you will still get a balanced, leveled look. It’s the sweet spot between looks and performance.

1. Check the “Get a Quote” checkbox on the product page below Lift Height Details and above Upper Control Arms.
2. Checkout and Pay for your Lift Kit.
3. We’ll match you with handpicked, Mudify-certified installers near the ZIP from your checkout—carefully vetted, truly local.
4. We’ll send you a detailed quote with pricing and shop details.
5. Confirm the quote and we’ll reach out to schedule the date for you.
6. On installation day, don't forget to bring your new parts to the shop.

Note: Parts are always shipped to your home, not to the shop.

• Quality-First Installation: From quote to keys back, we oversee every step with our handpicking Mudify-approved shop so you get pro-level results without the runaround.
• Less hassle: Skip the search—We curate elite, pre-vetted local shops, protecting your time—and your warranty—from shaky work.
• Better Pricing - Zero haggling: We leverage partner rates with elite shops and pass the discount straight to you—with a clean and detailed quote before you book.

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