Rear Differential Mount Insert Kit (1 Insert) - Front Position
This product was last offered at the strikethrough price on
08-09-2025

Product Details
Ready to launch hard? Put the power to the ground with more solid and reliable power transfer with our ECS Tuning Rear Differential Bushing Insert Kit!
Enhance your vehicle's driveline rigidity and response time for harder launches and faster 0-60 times all while reinforcing old, worn out bushings. Featuring a combination of polyurethane and billet aluminum, these inserts take up the void's found within the rear differential mounting bushings and do not excessively increase NVH. In addition, they do not require removal of the OEM bushings, making installation simpler than a full replacement.
PART DESIGN
-- The Problem: --
The factory rear differential is prone to excessive movement which reduces power transfer reaction time and reduces traction. The slop from the differential is caused by voids within the OEM rear differential mounting bushings and aged/worn bushings. This slop translates to a mushy transfer of power from the driveshaft to the rear tires leaving room on the table for much improvement.
-- The Solution: --
Our ECS Rear Differential Bushing Inserts take up the voids found within these mounting bushings while simultaneously reinforcing the bushing if it's aged or worn out to increase traction and rapidly improve power transfer to the rear tires.
Two inserts make up the ECS Rear Diff. Bushing Insert Kit: The aluminum insert cap and the polyurethane bushing insert.
The aluminum insert is made from 6061-T6 aluminum for it's strength and lightweight properties. It's black anodized for corrosion protection and features a factory inverted profile to take up the voids within the rear differential mounting bushings.
The polyurethane insert is made from 93A durometer, void-free polyurethane for strength and NVH suppression. Like the aluminum insert, it also features a factory inverted profile to take up the voids within the rear differential mounting bushings to reduce bushing deflection and limit overall slop in the drivetrain.
Each kit includes an OEM TTY (Torque-To-Yield) bolt that is required to be replaced every time it has been torqued and a packet of poly. bushing lubricant to be used during installation.
PERFORMANCE FEATURES
By planting the rear differential with our bushing inserts, your vehicle will be able to launch harder with more available traction and with greater reaction speed. By removing the amount of slop or "lash" from the drivetrain, sudden torque transfer from the driveshaft to the rear tires is less violent as the parts are held tighter together.
Our R&D Team tested an APR Stage 2 tuned, 2015 Golf R (DSG) with a stock rear end against our ECS Diff. and Subframe Bushing Inserts and observed an improvement in the 0-60mph time. It's best "P3 Gauge" recorded 0-60mph time was 3.7000 seconds; now that's launching hard!
Whether your vehicle is used for street, drag or HPDE, our ECS Rear Differential Bushing Inserts will keep your rear-end planted for improved traction when you need it most.
PRODUCT DEVELOPMENT
Our VW Product Development Team found that there were no performance options for rear differential performance on current VW 4Motion vehicles. Our R&D team set out to improve on the reliability and performance for modern 4Mo. VW's, that were available in other markets.
We reviewed many combinations of rear differentials throughout the model years and punished our bushings on a MK5 R32, MK6 Golf R and a MK7 Golf R to validate their performance and long term benefits.
Our ECS Rear Differential Bushing Inserts were designed, engineered, tested and quality inspected by our Research and Development team in our Wadsworth, Ohio facility. We ensured the highest level of precision and quality is delivered throughout rigorous long term product testing and leading edge product development methods.
INSTALLATION AND SUPPORT
Available as a single bushing insert for the front position (pinion), this position allows for the easiest installation with good results in keeping the pinion from deflecting upwards on hard launches.
When purchased as the set of three, (1) pinion and (2) case, this combination requires partial removal of the rear subframe to gain access to the top-side mounting bolts but provides the highest level of performance enhancements.
Looking for more installation tips? Look no further, we put together a full installation tutorial from start to finish including how to remove your OEM parts! See our Installation PDF under the INSTALLATION Tab for more information.
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- 1K0599438
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- 1K0599431
This Part Fits the Following Vehicles
Make | Model | Submodel | Engine | Special Fitment Notes |
---|---|---|---|---|
Audi | 8V S3 | Quattro | 2.0T | Use vehicle selector to confirm fitment |
Audi | 8Y A3 | Quattro | 2.0T | Use vehicle selector to confirm fitment |
Audi | 8Y RS 3 | Quattro | 2.5T | Use vehicle selector to confirm fitment |
Audi | 8Y S3 | Quattro | 2.0T | Use vehicle selector to confirm fitment |
Audi | A3 8P | Quattro | 2.0T | Use vehicle selector to confirm fitment |
Audi | A3 8P | Quattro | 3.2L | Use vehicle selector to confirm fitment |
Audi | A3 8P | Quattro | V6 3.2L | Use vehicle selector to confirm fitment |
Audi | A3 8V | Quattro | 2.0T | Use vehicle selector to confirm fitment |
Audi | RS3 | 8V (2018+) | 2.5T | Use vehicle selector to confirm fitment |
Volkswagen | Alltrack | All | 1.8T Gen3 | Use vehicle selector to confirm fitment |
Volkswagen | Arteon | 4Motion | 2.0T Gen3 | Use vehicle selector to confirm fitment |
Volkswagen | Arteon | FWD | 2.0T Gen3 | Use vehicle selector to confirm fitment |
Volkswagen | Golf R | All | 2.0T | Use vehicle selector to confirm fitment |
Volkswagen | Golf VII R | 4Motion | 2.0T Gen3 | Use vehicle selector to confirm fitment |
Volkswagen | Golf VII R Facelift | 4Motion | 2.0T Gen3 | Use vehicle selector to confirm fitment |
Volkswagen | Golf VIII R | 4Motion | 2.0T Evo4 | Use vehicle selector to confirm fitment |
Volkswagen | R32 MKV | All | 3.2 | Use vehicle selector to confirm fitment |
Volkswagen | Tiguan 1 | 4 Motion | 2.0T | Use vehicle selector to confirm fitment |
Volkswagen | Tiguan 2 | 4 Motion | 2.0T | Use vehicle selector to confirm fitment |
Volkswagen | Tiguan MQB | 4Motion | 2.0T Gen3 | Use vehicle selector to confirm fitment |
Volkswagen | Tiguan MQB | FWD | 2.0T Gen3 | Use vehicle selector to confirm fitment |
Kit Contents
Description | Brand | Qty | Lifetime | |
---|---|---|---|---|
Rear Differential Mount Insert Kit |
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1 | YES |

Installation
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Return Process
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Free Shipping On Orders $49 & Up
Items marked with a 'Free Shipping On Orders $49 and Up' logo may qualify for free standard economy ground shipping to the contiguous United States (48 states) for most orders with a value greater or equal to $49.00 USD. Oversized products and direct ship products are excluded from this offer unless otherwise noted.
Free Shipping
Items marked as 'Free Shipping' may qualify for free standard economy ground shipping to the contiguous United States (48 states). Oversized products and direct ship products are excluded from this offer unless otherwise noted.
The policies listed above are subject to change at any time without notice.
Lifetime Replacement
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Why You Should Shop From ECS Tuning
ECS Tuning stands out as more than an automotive parts supplier-it's a vibrant community fueled by a shared passion for cars. Born from the enthusiasm of car lovers, we offer an unmatched understanding and commitment to the automotive world, providing high-quality parts and accessories sourced from our own experiences. Our selection is meticulously crafted to meet the highest standards of performance, quality, and design, catering to both the latest trends and classic styles.
Our distinct advantage lies in our passionate team and comprehensive support, offering expert advice and seamless service from selection to installation. Shopping with ECS brings exclusive perks, including our Lifetime Replacement Guarantee and free shipping on orders over $49, enhancing the value of every purchase. As a central hub for car enthusiasts, ECS Tuning fosters a rich community where ideas and experiences flourish, transforming us from a mere supplier into a platform where automotive dreams come to life.
Cancellation Policy
At ECS Tuning, we understand that plans can change. That's why we offer a flexible cancellation policy for our customers. You may cancel your order at any time before you receive the shipment confirmation. This policy is designed to provide you with peace of mind and the flexibility to make adjustments to your purchases as needed. Should you decide to cancel your order, simply reach out to our customer service team, and we will assist you with the process swiftly and efficiently.
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