What is the main benefit of using polyurethane differential bushings?

Polyurethane is stiffer than stock rubber bushings. This means it resists deflection better under the forces of acceleration and cornering, leading to a more solid feel from the drivetrain and potentially improved handling response.

Are these bushings a direct replacement for the original parts?

Yes, these Prothane bushings are designed to be a direct replacement for the stock differential bushings in the Independent Rear Suspension (IRS) housing found on the 1999-2004 Ford Mustang Cobra and other IRS-equipped models.

What color is the polyurethane material?

This particular set of bushings is made from Prothane's well-known red polyurethane compound.

1999-2004 Ford Mustang Rear Diff Bushings

Name: Prothane 99-04 Ford Cobra IRS Rear Diff Bushings - Red
Brand: Prothane
SKU: prothane-prothane-99-04-ford-cobra-irs-rear-diff-bushings-red-t14-99763
Price: 17.36 USD
Availability: BackOrder

Prothane 99-04 Ford Cobra IRS Rear Diff Bushings - Red

$17.36

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 1999-2004 Ford Mustang. Prothane rear differential bushings help keep your IRS housing stable.

Key Features

Fits 1999-2004 Ford Mustang.
Replaces stock rubber differential bushings in the IRS housing.
Made from Prothane's red polyurethane material for improved stiffness.
Helps to reduce differential movement under load for a more direct feel.

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Product Details

When you're working on the rear differential of your 1999-2004 Ford Mustang, especially if you're aiming for improved handling or replacing worn components, the condition of your differential bushings is key. These Prothane polyurethane bushings are made to replace the stock rubber ones in the Independent Rear Suspension (IRS) housing. They help to firm up the connection between the differential and the chassis, which can make a noticeable difference in how the car feels during acceleration and cornering.

Polyurethane is a popular choice for suspension components because it's more rigid than rubber, meaning it won't deflect as much under load. This reduced deflection translates to a more direct feel from the drivetrain and can help prevent unwanted movement of the differential. Prothane has been making these types of parts for a long time, and their red polyurethane compound is well-known for balancing performance with reasonable durability for daily driving or spirited use.

Replacing these bushings is a common task when rebuilding or upgrading the IRS on these Mustangs. Make sure you have the right tools and a good service manual to guide you through the process, as getting the differential properly supported and aligned is important for a successful installation.