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Audi B8/B8.5 S4 Quattro 3.0T

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Audi B8/B8.5 S4 Quattro 3.0T Differential Parts

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Max-Gear Gear Oil 75w90 - 1 Quart

ES#263484 - 01300 - Max-Gear Gear Oil 75w90 - 1 Quart - Max-Gear is recommended for use in front or rear open differentials, manual transmissions, and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid - Royal Purple - Audi BMW Volkswagen Mercedes Benz Porsche

Max-Gear is recommended for use in front or rear open differentials, manual transmissions, and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Royal Purple - Corporate Logo
ES#:
263484
Mfg#:
01300
Ships in 5 Business Days
$22.99 USD
Free Shipping
on orders $49 and up

Rear Differential Carrier Mount Insert Kit

ES#2966689 - 034-505-2016 - Rear Differential Carrier Mount Insert Kit - Installation is very simple, can be performed in minutes, and is completely reversible. - 034Motorsport - Audi

Installation is very simple, can be performed in minutes, and is completely reversible. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
034Motorsport - Corporate Logo
ES#:
2966689
Mfg#:
034-505-2016
Ships in 2 Business Days
$134.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Rear Differential Mount

ES#2577247 - 8K0599287J - Rear Differential Mount - Also known as the cross member - Genuine Volkswagen Audi - Audi

Also known as the cross member affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2577247
Mfg#:
8K0599287J
Special Order: No Guaranteed ETA
9% off MSRP

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

$546.99

This product was last offered at the strikethrough price on
06-07-2026

$499.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear Carrier Mount Bushing - Priced Each

ES#450894 - 8K0599257N - Rear Carrier Mount Bushing - Priced Each - Fits left and right side - Genuine Volkswagen Audi - Audi

Fits left and right side affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
450894
Mfg#:
8K0599257N
Ships in 5 Business Days
9% off MSRP

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

$88.99

This product was last offered at the strikethrough price on
06-07-2026

$80.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear Differential Service Kit

ES#3660796 - n10037105ktKT7 - Rear Differential Service Kit - Complete kit with Redline 75w90 fluid with OEM drain/fill plugs and seals to service your rear differential. - Assembled By ECS - Audi

Complete kit with Redline 75w90 fluid with OEM drain/fill plugs and seals to service your rear differential. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
For vehicles without Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
3660796
Mfg#:
N10037105KTKT7
In Stock
ON SALE!
$97.99

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

$95.98 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Front Axle Flange Seal - Right

ES#1848157 - 0B4409400D - Front Axle Flange Seal - Right - Seals the connection between the axle flange and transmission - Genuine Volkswagen Audi - Audi

Seals the connection between the axle flange and transmission affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
1848157
Mfg#:
0B4409400D
Ships in 3 Business Days
11% off MSRP

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

$44.99

This product was last offered at the strikethrough price on
06-07-2026

$39.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Front Axle Flange Seal - Left

ES#2501297 - 0AW409399 - Front Axle Flange Seal - Left - Seals the connection between the axle flange and transmission - Genuine Volkswagen Audi - Audi

Seals the connection between the axle flange and transmission affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2501297
Mfg#:
0AW409399
Ships in 3 Business Days
6% off MSRP

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

$52.99

This product was last offered at the strikethrough price on
06-07-2026

$49.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Heavy ShockProof Gear Oil - 1 Gallon

ES#2847972 - 58205 - Heavy ShockProof Gear Oil - 1 Gallon - For heavily-loaded racing differentials and transmissions, problem gearboxes - Redline - Audi BMW Volkswagen Mercedes Benz

For heavily-loaded racing differentials and transmissions, problem gearboxes affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For Custom Applications Only.

Brand:
Redline - Corporate Logo
ES#:
2847972
Mfg#:
58205
In Stock
$99.99 USD
Free Shipping
on orders $49 and up

Axle Flange Seal - Priced Each

ES#3464831 - 0AR409399B - Axle Flange Seal - Priced Each - Fits the left & right side - Corteco - Audi

Fits the left & right side affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles without Torque Vectoring differentials

Brand:
Corteco - Corporate Logo
ES#:
3464831
Mfg#:
0AR409399B
In Stock
$12.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear Differential Service Kit - With ECS Magnetic Drain/Fill Plugs

ES#2593489 - 0AR409399BKT1 - Rear Differential Service Kit - With ECS Magnetic Drain/Fill Plugs - Complete kit with Redline 75w90 GL-5 fluid to service your rear differential - Assembled By ECS - Audi

Complete kit with Redline 75w90 GL-5 fluid to service your rear differential affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
For vehicles without Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
2593489
Mfg#:
0AR409399BKT1
Ships on Aug 14, 2026
Auto Notify
ON SALE! SAVE 23%
$128.65

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

$98.96 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Axle Flange Seal - Priced Each

ES#1894525 - 0AR409399B - Axle Flange Seal - Priced Each - Fits the left & right side - Genuine Volkswagen Audi - Audi

Fits the left & right side affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles without Torque Vectoring differentials

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
1894525
Mfg#:
0AR409399B
In Stock
24% off MSRP

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

$34.18

This product was last offered at the strikethrough price on
06-07-2026

$25.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear Differential Leak Repair Kit

ES#2593503 - 02D525596BKT - Rear Differential Leak Repair Kit - Complete kit with OE fluid to service your rear differential - Genuine Volkswagen Audi - Audi Volkswagen

Complete kit with OE fluid to service your rear differential affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with Torque Vectoring differentials

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2593503
Mfg#:
02D525596BKT
Ships in 3 Business Days
$259.99 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Rear Diff Rear Bushing Inserts - Street

ES#4869773 - PFR3-743 - Rear Diff Rear Bushing Inserts - Street - A performance insert with an increased stiffness - Powerflex - Audi

A performance insert with an increased stiffness affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Powerflex - Corporate Logo
ES#:
4869773
Mfg#:
PFR3-743
Ships in 1 Business Day
$85.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Axle Flange Seal - Priced Each

ES#2707342 - 02D525596F - Axle Flange Seal - Priced Each - Stop leaks from your differential - Genuine Volkswagen Audi - Audi Volkswagen

Stop leaks from your differential affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits the left & right side for vehicles with Torque Vectoring differentials

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2707342
Mfg#:
02D525596F
Ships in 3 Business Days
7% off MSRP

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

$116.99

This product was last offered at the strikethrough price on
06-07-2026

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

Rear Differential Lower Mount Bushing Insert - Street

ES#4869768 - PFR3-741 - Rear Differential Lower Mount Bushing Insert - Street - This is an insert to fit into the original bushing to minimize the movement of the diff under acceleration. - Powerflex - Audi

This is an insert to fit into the original bushing to minimize the movement of the diff under acceleration. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
From production date 4/28/2009

Brand:
Powerflex - Corporate Logo
ES#:
4869768
Mfg#:
PFR3-741
Ships in 1 Business Day
$55.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Driveshaft Flange Seal

ES#3010806 - 0D2598078 - Driveshaft Flange Seal - Seals the propeller shaft flange to the rear differential - Genuine Volkswagen Audi - Audi

Seals the propeller shaft flange to the rear differential affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with Torque Vectoring differentials

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3010806
Mfg#:
0D2598078
Ships in 4 Business Days
7% off MSRP

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

$163.99

This product was last offered at the strikethrough price on
06-07-2026

$152.99 USD
Free Shipping
on orders $49 and up
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.

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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