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Audi B8/B8.5 S5 Quattro V8 4.2L

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Audi B8/B8.5 S5 Quattro V8 4.2L Differential Parts

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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 10X Entries For Our 25th Anniversary Sweepstakes!
For vehicles without Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
2593489
Mfg#:
0AR409399BKT1
Ships in 1 Business Day
ON SALE! SAVE 23%
$128.65

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

$98.98 USD
Free Shipping
This product is lifetime replacement eligible Partial 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 For vehicles with Torque Vectoring differentials

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2593503
Mfg#:
02D525596BKT
Ships in 1 day
$259.99 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Rear Differential Service Kit

ES#2765431 - 0AR409399BKT3 - Rear Differential Service Kit - Complete kit to properly service your rear differential - Assembled By ECS - Audi

Complete kit to properly service your rear differential 10X Entries For Our 25th Anniversary Sweepstakes!
For vehicles without Torque-Vectoring rear differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
2765431
Mfg#:
0AR409399BKT3
In Stock
ON SALE!
$84.99

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

$78.61 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Drain/Fill Plug - Priced Each

ES#4688635 - N90281802 - Drain/Fill Plug - Priced Each - Commonly found as a drain or fill plug. M10x1x10 - Bremmen Parts - Audi Volkswagen

Commonly found as a drain or fill plug. M10x1x10 10X Entries For Our 25th Anniversary Sweepstakes!

For vehicles with Torque Vectoring rear differentials

Brand:
Bremmen Parts - Corporate Logo
ES#:
4688635
Mfg#:
N90281802
In Stock
ON SALE!
$2.64

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

$2.51 USD
Free Shipping
on orders $49 and up

Propeller Shaft Gasket

ES#3287255 - 95B521142 - Propeller Shaft Gasket - Located between the driveshaft and the front & rear differentials - Genuine Porsche - Audi Porsche

Located between the driveshaft and the front & rear differentials

Brand:
Genuine Porsche - Corporate Logo
ES#:
3287255
Mfg#:
95B521142
Ships in 2 Business Days
$42.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Front Axle Flange Seal - Right

ES#3464834 - 0B4409400D - Front Axle Flange Seal - Right - Seals the connection between the axle flange and transmission - Corteco - Audi

Seals the connection between the axle flange and transmission Seals the right side axle flange for vehicles with 6-Speed manual transmission

Brand:
Corteco - Corporate Logo
ES#:
3464834
Mfg#:
0B4409400D
In Stock
$10.28 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Front Axle Flange Seal - Left

ES#4736573 - 0AW409399 - Front Axle Flange Seal - Left - Seals the connection between the axle flange and transmission - Elring - Audi

Seals the connection between the axle flange and transmission 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
From production date 12/4/2012

Brand:
Elring - Corporate Logo
ES#:
4736573
Mfg#:
0AW409399
In Stock
$18.99

This product was last offered at the strikethrough price on
04-08-2026

$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Driveshaft Bolt Spacer - Priced Each

ES#3668936 - 8W0407357 - Driveshaft Bolt Spacer - Priced Each - Located between rear driveshaft bolts and driveshaft flange - 3 required - Genuine Volkswagen Audi - Audi

Located between rear driveshaft bolts and driveshaft flange - 3 required

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3668936
Mfg#:
8W0407357
In Stock
ON SALE! SAVE 50%
$1.99

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

$0.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear Differential Service Kit

ES#2765430 - 0AR409399BKT2 - Rear Differential Service Kit - Complete kit to properly service your rear differential - Genuine Volkswagen Audi - Audi

Complete kit to properly service your rear differential For vehicles without Torque-Vectoring rear differentials

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2765430
Mfg#:
0AR409399BKT2
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

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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