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Audi A4 Differential Parts

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Hex Low Profile Service Sockets

ES#4464389 - AGA-SS-8-14-K - Hex Low Profile Service Sockets - Due to minimal clearance, its difficult to get a hex socket in the gaps to remove plugs on rear differentials, transfer case and other engine drain/fill plugs. - AGA Tools - Audi BMW Volkswagen Mercedes Benz MINI Porsche

Due to minimal clearance, it’s difficult to get a hex socket in the gaps to remove plugs on rear differentials, transfer case and other engine drain/fill plugs.

Brand:
AGA Tools - Corporate Logo
ES#:
4464389
Mfg#:
AGA-SS-8-14-K
Ships in 7 Business Days
$169.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

High Performance Gear Oil (GL4+) SAE 75W-90 (20L JUG)

ES#3660870 - 20014 - High Performance Gear Oil (GL4+) SAE 75W-90 (20L JUG) - Fully synthetic GL4+ gear oil, for use on the street or the track - Liqui-Moly - Audi BMW Volkswagen Mercedes Benz Porsche

Fully synthetic GL4+ gear oil, for use on the street or the track 10X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Liqui-Moly - Corporate Logo
ES#:
3660870
Mfg#:
20014
In Stock at Vendor
$500.99 USD

Genuine Quattro Ultra Service Kit

ES#5445322 - G055515A2KT3 - Genuine Quattro Ultra Service Kit - Includes Genuine Fluid and Two (2) Drain/Fill Plugs - Genuine Volkswagen Audi - Audi

Includes Genuine Fluid and Two (2) Drain/Fill Plugs

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
5445322
Mfg#:
G055515A2KT3
Ships on Aug 7, 2026
Auto Notify
$41.99 USD
Free Shipping
on orders $49 and up
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!

Brand:
Enthusiast Bundles - Corporate Logo
ES#:
4751048
Mfg#:
000703LA01EBKT
In Stock
ON SALE! SAVE 29%
$1288.99

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

$917.20 USD
Free Shipping
This product is lifetime replacement eligible Lifetime 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.

Brand:
034Motorsport - Corporate Logo
ES#:
2966690
Mfg#:
034-505-2019
Ships in 2 Business Days
ON SALE! SAVE 10%
$117.00

This product was last offered at the strikethrough price on
06-28-2026

$105.30 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

MT-85 75W-85 GL-4 Gear Oil - 1 Quart

ES#2847948 - 50504 - MT-85 75W-85 GL-4 Gear Oil - 1 Quart - Synthetic gear oil for superior performance in your differential - Redline - Audi Mercedes Benz

Synthetic gear oil for superior performance in your differential

Brand:
Redline - Corporate Logo
ES#:
2847948
Mfg#:
50504
In Stock
$25.99 USD
Free Shipping
on orders $49 and up

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. 10X Entries For Our 25th Anniversary Sweepstakes!
For vehicles with Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
4361552
Mfg#:
N90281802KTKT4
In Stock
ON SALE! SAVE 17%
$161.99

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

$134.22 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial 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 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

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. 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 17%
$114.99

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

$95.96 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Fill & Drain Plug (M16x1.5)

ES#288792 - 0AA409057 - Fill & Drain Plug (M16x1.5) - Differential fill & drain plug - Genuine Volkswagen Audi - Audi Volkswagen

Differential fill & drain plug For axle code letter HNL, HNP, JKN

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
288792
Mfg#:
0AA409057
Ships in 2 Business Days
37% off MSRP

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

$37.99

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

$23.99 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 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
07-19-2026

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

Driveshaft Gasket - Priced Each

ES#4067260 - 183521141A - Driveshaft Gasket - Priced Each - Fits the front and rear position - Rein - Audi Volkswagen

Fits the front and rear position 2X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Rein - Corporate Logo
ES#:
4067260
Mfg#:
183521141A
Ships in 1 Business Day
$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Street Density Rear Differential Bushings - Pair

ES#3176342 - 034-505-2001-SD - Street Density Rear Differential Bushings - Pair - Eliminates excessive rear differential movement and provides quick feedback - 034Motorsport - Audi

Eliminates excessive rear differential movement and provides quick feedback

Brand:
034Motorsport - Corporate Logo
ES#:
3176342
Mfg#:
034-505-2001-SD
In Stock
ON SALE! SAVE 10%
$44.00

This product was last offered at the strikethrough price on
06-28-2026

$39.60 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear Differential Carrier Mount Insert Kit

ES#2873006 - 034-505-2015 - 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.

Brand:
034Motorsport - Corporate Logo
ES#:
2873006
Mfg#:
034-505-2015
Back Ordered
Auto Notify
ON SALE! SAVE 10%
$123.00

This product was last offered at the strikethrough price on
06-28-2026

$110.70 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

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

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