Rear Leaf Spring Shackles - Ford Mustang - 4.2135

  • 4.2135 Rear Leaf Spring Shackles
  • 4.2135 Rear Leaf Spring Shackles

Rear Leaf Spring Shackles

Manufacturer: Energy Suspension
Part Number: 4.2135


Free Lifetime Warranty Upgrade
Price: $152.59

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  • 4 - 2018 - Spring Eye R Main
  • 8 - 2020 - Spring Eye R Shackle
  • 2 - (.750OD x .500ID x 3.085L)
  • 4 - (.750OD x .562ID x 3.000L)
  • 4 - (9/16-12 X 4-1/2" GR8 BOLT)
  • 4 - - H Duty Shackle Bracker
  • 4 - - 9/16-12 Nylon Silver Nut Insert
  • 1 - 9.11102 - 10 Grams Grease Package
  • 1 - 17040 - Instruction for Spring Eye Bush
Suggested part for 4.2135: 9.11110
9.11110 Formula 5 Prelube 3 - 5 mL Tubes
Energy Suspension provides grease to install these parts, but you can never have too much. Grab an extra 3-pack of grease so you can more liberally apply grease when installing.

Suggested part for 4.2135: 9.11104
9.11104 Formula 5 Prelube - 8oz. Tub Polyurethane Bushing Grease
8 ounce tub of High Performance Grease by Energy

  • Energy Suspension warrants its products against defects in workmanship and material for 7 years or 750,000 miles when used on passenger cars and light trucks. Products that have been abused, altered, or incorrectly installed are not covered. Energy Suspension will replace defective products or component parts, if inspection for factory personnel determines the part to be defective. Warranty replacement covers only the product. Labor claims, time loss, or freight charges will not be honored.
Cross Reference from 4.2135 to 61053
Prothane 61053
Price: $154.62
Warranty: Lifetime Warranty

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FitmentRear Leaf Spring Shackles 4.2135 fits these vehicles:
Heavy Duty Shackle Sets
Reduces wheel hop on acceleration, shudder on braking and delivers greater handling control. Great for vehicles with high performance tires and horsepower upgrades.

Rear Leaf Spring Shackles - Ford Mustang - 4.2135

Includes All Spring and Shackle Bushings
Heavy Duty Shackle Set
  • Includes Hardware
  • Reduces Wheel Hop Upon Acceleration and Shudder when Braking
  • Delivers Great Handling Control
  • Made of Energy's HYPERFLEX performance polyurethane to add performance and durability
  • One Set Will Cover the Left and Right Side

Energy Suspension HyperFlex Leaf Spring and Shackle Bushings

Vehicles with a leaf spring and shackle set up lean heavily on the springs to take the shock out of a bump. Not only does a leaf spring reduce the force of a bump that you feel, but it also evenly distributes the load across the chassis instead of the whole load pressing down on one point. Your ability to get to point A to point B without scraping the pavement is heavily dependent on the leaf spring and shackle bushings which mount the spring to the frame. Energy Suspension's Hyperflex polyurethane is a stronger material for the mounting points of a leaf spring and shackle. Polyurethane leaf spring bushings are able to handle the stress from the suspension and are not vulnerable to road grime. With Energy Suspension's polyurethane, you can protect your vehicle's ability to carry a load, and your bumpy free ride, for years to come.

Energy Hyperflex Leaf Spring
Energy Hyperflex Leaf Spring Lifespan

Replacing the Faulty Rubber

O.E. leaf spring and shackles utilize a soft rubber bushing to mount the spring to the frame. The rubber is great for reducing the noise and vibrations from being transferred into the cab. Unfortunately, rubber bushings have a short lifespan. Once the rubber fails, due to wear and tear or road grime, a leaf spring's effectiveness is severely reduced. Meaning you will experience a very bumpy ride, the vehicle's ability to carry a load or tow is hindered greatly and you'll experience a loss of control.

Be sure to use Formula 5

A leaf spring bushing rotates a lot against the metal shell, so make sure you grease it well with Energy Suspension's own Formula 5 Bushing Lubricant. Using plenty of grease is the best way to ensure a long lasting part without any squeaking. If you'd like some extra grease just in case, pick up an extra 3 pack or an 8 ounce tube.

Formula 5 Gif
Energy Suspension 4.2135

Product Reviews for Rear Leaf Spring Shackles - Ford Mustang - 4.2135

5 Star (1)
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Energy Suspension 4.2135

5 out of 5 based on 1 user reviews. Write a Review


starstarstarstarstar" Great Product "

A tight parts kit clearly assembled for specific application from high quality materials. No shaving or extra bolt / sleeve to cut down. I do recommend using a bit of anti-seize on the bolt shanks to prevent corrosion welding to sleeves, (as you may find when you try to extract the old bolts.) Tightens up suspension tolerances greatly.

verified_user Verified Buyer - - . Energy Suspension 4.2135 - 5 out of 5

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