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Audi A4 Differential Parts

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Billet Aluminum Rear Differential Mount Insert Kit

ES#3509529 - 034-505-2020 - Billet Aluminum Rear Differential Mount Insert Kit - Limits movement of factory rear diff mounts, increasing drivetrain rigidity and response! - 034Motorsport - Audi

Limits movement of factory rear diff mounts, increasing drivetrain rigidity and response! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
034Motorsport - Corporate Logo
ES#:
3509529
Mfg#:
034-505-2020
In Stock
$154.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Stainless Steel Magnetic Drain/Fill Plug - Priced Each

ES#2992215 - 010974ECS01 - Stainless Steel Magnetic Drain/Fill Plug - Priced Each - Capture harmful particles to prevent wear. M10x1x10 - ECS - Audi Volkswagen

Capture harmful particles to prevent wear. M10x1x10 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

For vehicles with Torque Vectoring rear differentials

Brand:
ECS - Corporate Logo
ES#:
2992215
Mfg#:
010974ECS01
In Stock
ON SALE! SAVE 35%
$34.99

This product was last offered at the strikethrough price on
05-02-2026

$22.74 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

B8/C7 Center Differential Delete - NO WELDING NEEDED

ES#4375353 - 012535LA01 - B8/C7 Center Differential Delete - NO WELDING NEEDED - Easily allows the removal of center differential when converting your B8 S4 to RWD (rear wheel drive) from Quattro - ECS - Audi

Easily allows the removal of center differential when converting your B8 S4 to RWD (rear wheel drive) from Quattro affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
100% reversible RWD kit when paired with our Axle Delete Plugs (ES4373491) Please make sure via VIN that

Brand:
ECS - Corporate Logo
ES#:
4375353
Mfg#:
012535LA01
Ships on Jul 6, 2026
Auto Notify
ON SALE! SAVE 20%
$443.99

This product was last offered at the strikethrough price on
05-02-2026

$355.19 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Center Differential Service Kit

ES#3658485 - g055145a2KT - Center Differential Service Kit - Fluid and plug to service your transfer case/center differential on your automatic Audi - Genuine Volkswagen Audi - Audi

Fluid and plug to service your transfer case/center differential on your automatic Audi affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with 6-speed automatic transmission only

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3658485
Mfg#:
G055145A2KT
Ships in 1-2 days
$169.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

M24x1.5mm Magnetic Drain/Fill Plug - Each

ES#3660327 - 000920ECS01 - M24x1.5mm Magnetic Drain/Fill Plug - Each - Capture harmful particles to prevent wear. M24x1.5 - ECS - Audi BMW Volkswagen Porsche

Capture harmful particles to prevent wear. M24x1.5 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Manual transmission vehicles only

Brand:
ECS - Corporate Logo
ES#:
3660327
Mfg#:
000920ECS01
In Stock
ON SALE! SAVE 40%
$41.99

This product was last offered at the strikethrough price on
05-02-2026

$25.19 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear Differential Service Kit

ES#4620706 - G055190A2-2KT - Rear Differential Service Kit - Complete kit with Genuine fluids and drain plugs to service your rear differential - Genuine Volkswagen Audi - Audi

Complete kit with Genuine fluids and drain plugs to service your rear differential affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4620706
Mfg#:
G055190A2-2KT
In Stock
$58.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Complete Rear Differential Mount Kit

ES#3172515 - 018327ecs01KT - Complete Rear Differential Mount Kit - Includes the ECS Rear Differential Mount and Carrier Mount Inserts! - ECS - Audi

Includes the ECS Rear Differential Mount and Carrier Mount Inserts! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3172515
Mfg#:
018327ECS01KT
Ships on Jul 17, 2026
Auto Notify
ON SALE! SAVE 15%
$377.99

This product was last offered at the strikethrough price on
05-02-2026

$321.29 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Drain/Fill Plug - Priced Each

ES#469442 - N90281802 - Drain/Fill Plug - Priced Each - Commonly found as a drain or fill plug. M10x1x10 - Genuine Volkswagen Audi - Audi Volkswagen

Commonly found as a drain or fill plug. M10x1x10 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with Torque Vectoring rear differentials

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
469442
Mfg#:
N90281802
In Stock
25% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$3.99

This product was last offered at the strikethrough price on
06-02-2026

$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Adjustable Damping Performance Coilover System - Audi B6/B7 A4/S4 & Performance Rear Differential Mount

ES#4751047 - 027966ECS01EBKT - Adjustable Damping Performance Coilover System - Audi B6/B7 A4/S4 & Performance Rear Differential Mount - Take control of your ride while going low with our sport-tuned coilover system! - Enthusiast Bundles - Audi

Take control of your ride while going low with our sport-tuned coilover system! Don't See A Bundle You Want - Give Us A Call Or Chat - We Will Make One! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Enthusiast Bundles - Corporate Logo
ES#:
4751047
Mfg#:
027966ECS01EBKT
Ships in 1-2 days
ON SALE! SAVE 30%
$1205.99

This product was last offered at the strikethrough price on
05-05-2026

$849.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

MoS2 Anti Friction Additive For Manual Transmission / Differential

ES#261605 - 2019 - MoS2 Anti Friction Additive For Manual Transmission / Differential - Increase the life of your gear oil, and decrease gearbox noise - Liqui-Moly - Audi BMW Volkswagen Porsche

Increase the life of your gear oil, and decrease gearbox noise affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Liqui-Moly - Corporate Logo
ES#:
261605
Mfg#:
2019
In Stock
45% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$21.95

This product was last offered at the strikethrough price on
06-02-2026

$11.99 USD
Free Shipping
on orders $49 and up

Drain/Fill Plug - Priced Each

ES#8026 - N10037105 - Drain/Fill Plug - Priced Each - Used in both the drain and fill location. M22x1.5 - Genuine Volkswagen Audi - Audi Volkswagen

Used in both the drain and fill location. M22x1.5 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For axle code letter HUQ, HUN, HUP

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
8026
Mfg#:
N10037105
In Stock
30% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$14.88

This product was last offered at the strikethrough price on
02-23-2026

$10.49 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Drain/Fill Plug - Priced Each

ES#467288 - N10037106 - Drain/Fill Plug - Priced Each - Removed to drain or fill your transmission/differential fluid. M22x1.5 - Genuine Volkswagen Audi - Audi Volkswagen

Removed to drain or fill your transmission/differential fluid. M22x1.5 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
467288
Mfg#:
N10037106
In Stock
3% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$14.88

This product was last offered at the strikethrough price on
06-02-2026

$14.38 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Complete Drivetrain Mount Insert Kit

ES#3194637 - 019208ecs01KT1 - Complete Drivetrain Mount Insert Kit - Decrease slop and increase drivetrain rigidity and response! - ECS - Audi

Decrease slop and increase drivetrain rigidity and response! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Does not fit manual transmission models

Brand:
ECS - Corporate Logo
ES#:
3194637
Mfg#:
019208ECS01KT1
In Stock
ON SALE!
$237.99

This product was last offered at the strikethrough price on
05-02-2026

$226.09 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

JHM Helical Rear Limited Slip Differential

ES#4045950 - B6B7RearLSDMT - JHM Helical Rear Limited Slip Differential - Helical gears respond to changes in traction conditions very quickly - Improves traction and predictability of vehicle behavior: both rear wheels will spin at the same rate. - JH Motorsports - Audi

Helical gears respond to changes in traction conditions very quickly - Improves traction and predictability of vehicle behavior: both rear wheels will spin at the same rate. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
*Fitment confirmed in ETS, EXZ, & ETQ diff codes - Does not fit in some 2007+ differential cases - Please see fitment notes in product description for co

Brand:
JH Motorsports - Corporate Logo
ES#:
4045950
Mfg#:
B6B7REARLSDMT
Ships on Jun 18, 2026
$949.99 USD
Free Shipping
on orders $49 and up

Rear Differential Service Kit

ES#2593469 - 0AR409399BKT - Rear Differential Service Kit - Complete kit with OE fluid to service your rear differential - Genuine Volkswagen Audi - Audi

Complete kit with OE fluid to service your rear differential affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles without Torque Vectoring differentials

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2593469
Mfg#:
0AR409399BKT
In Stock
$110.99

This product was last offered at the strikethrough price on
02-24-2026

$108.99 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

B5 A4 / S4 Quattro Adjustable Damping Coilovers & Performance Rear Differential Mount

ES#4751048 - 000703LA01EBKT - B5 A4 / S4 Quattro Adjustable Damping Coilovers & Performance Rear Differential Mount - Features 32 way adjustable damping, variable length and zinc-coated shock bodies - Enthusiast Bundles - Audi

Features 32 way adjustable damping, variable length and zinc-coated shock bodies Don't See A Bundle You Want - Give Us A Call Or Chat - We Will Make One! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Enthusiast Bundles - Corporate Logo
ES#:
4751048
Mfg#:
000703LA01EBKT
In Stock
ON SALE! SAVE 30%
$1288.99

This product was last offered at the strikethrough price on
05-05-2026

$899.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

More About Differential Parts

Stock or limited-slip, we stock bearings, repair parts, complete differential units, and approved differential fluids so you can keep sending power to the axles without noise, harshness, or vibration.

Let us help you find the parts that fit your Audi

ECS Tuning is not affiliated with any automobile manufacturers.
Manufacturer names and/or part numbers are used only for identification purposes.

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