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Audi B8/B8.5 S4 Quattro 3.0T

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

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Rear Differential Carrier Mount Insert Kit - Black

ES#4620258 - 8K0599257N - Rear Differential Carrier Mount Insert Kit - Black - Enhance your driving experience by filling the bushing void. - JH Motorsports - Audi

Enhance your driving experience by filling the bushing void. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
JH Motorsports - Corporate Logo
ES#:
4620258
Mfg#:
8K0599257N
In Stock
$67.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear differential lower Mount Bushing

ES#450897 - 8K0599381H - Rear differential lower Mount Bushing - Located under the rear differential towards the front - Genuine Volkswagen Audi - Audi

Located under the rear differential towards the front affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
From production date 4/28/2009

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
450897
Mfg#:
8K0599381H
Ships in 2 Business Days
8% off MSRP

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

$111.99

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

$102.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Rear Differential Service Kit

ES#4158614 - n90281802ktKT1 - Rear Differential Service Kit - Complete kit with Redline 75w90 fluid with ECS stainless steel magnetic plugs and seals to service your rear differential. - Assembled By ECS - Audi Volkswagen

Complete kit with Redline 75w90 fluid with ECS stainless steel magnetic 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 with Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
4158614
Mfg#:
N90281802KTKT1
In Stock
ON SALE! SAVE 13%
$114.99

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

$100.26 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Manual Transmission/Differential Fluid 75W-90 - One Gallon

ES#2739026 - 57905 - Manual Transmission/Differential Fluid 75W-90 - One Gallon - For use in front & rear open differentials as well as some manual transmissions - Redline - Audi BMW Volkswagen

For use in front & rear open differentials as well as some manual transmissions affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Redline - Corporate Logo
ES#:
2739026
Mfg#:
57905
In Stock
$97.99 USD
Free Shipping

Rear Differential Service Kit - With Service Tools

ES#4361552 - N90281802KTKT4 - Rear Differential Service Kit - With Service Tools - Complete kit with Redline 75w90 fluid with ECS stainless steel magnetic plugs and seals to service your rear differential. - Assembled By ECS - Audi Volkswagen

Complete kit with Redline 75w90 fluid with ECS stainless steel magnetic 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 with Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
4361552
Mfg#:
N90281802KTKT4
Ships on Jun 23, 2026
ON SALE! SAVE 14%
$161.99

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

$140.06 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Billet Aluminum Rear Differential Mount Upgrade

ES#2966690 - 034-505-2019 - Billet Aluminum Rear Differential Mount Upgrade - 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#:
2966690
Mfg#:
034-505-2019
In Stock
$117.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Axle Flange Seal - Priced Each

ES#3450009 - 02D525596F - Axle Flange Seal - Priced Each - Stop leaks from your differential - Corteco - 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:
Corteco - Corporate Logo
ES#:
3450009
Mfg#:
02D525596F
In Stock
$12.99

This product was last offered at the strikethrough price on
04-24-2026

$10.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear Differential Service Kit - With Service Tools

ES#4361551 - 0AR409399BKT4 - Rear Differential Service Kit - With Service Tools - 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#:
4361551
Mfg#:
0AR409399BKT4
In Stock
$160.99

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

$158.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Rear Differential Service Kit

ES#3660793 - n90281802ktKT - 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 Volkswagen

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 with Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
3660793
Mfg#:
N90281802KTKT
In Stock
ON SALE!
$53.99

This product was last offered at the strikethrough price on
04-24-2026

$52.29 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

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 3 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

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

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Manufacturer names and/or part numbers are used only for identification purposes.

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