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Real experience
We test before we recommend.
PRODUCT DESCRIPTION
BMW Differential Bearing Replacement Kit (up to 1999)
Looking for the highest quality solution to restore your BMW's differential performance? Our kit is designed for 168mm differentials, distinguished by their bolted side covers that secure the carrier unit, characteristic of models up to 1999.
Compatible BMW Models:
3 Series: E21 (large case), E30, E36
5 Series: E28, E34
7 Series: E23, E32, E38 (older models)
8 Series: E31
Z Series: Z1, Z3, Z8
Depending on your BMW's engine, we offer three differential sizes:
4-cylinder: 168mm
6-cylinder: 188mm
8-cylinder: 210mm
Symptoms indicating the need for differential bearing replacement: A noticeable noise coming from the differential during acceleration and deceleration is a key sign. To differentiate this noise from wheel bearing noises, try sharp maneuvers as if you were warming up your tires for a race. A persistent noise indicates the need for differential bearing replacement.
The kit includes:
Crush sleeve
Small pinion bearing
Large pinion bearing
Side bearing (x2)
Input flange oil seal
Output flange oil seals (x2)
Trust RacingDiffs for OEM quality components engineered for extended durability and optimal performance.










WHY THETUNERLAB
We have spent years building cars, racing, and testing the exact same parts that we sell.
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We test before we recommend.
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We help you choose the right part.
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Only trusted manufacturers.
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Before and after the purchase.
+10 years
of passion for drifting
+30.000
available products
+5.000
satisfied customers
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passion for motoring
Each product indicates compatible models in the product description. If you have any questions, you can contact us and we will help you choose your best option.
-If the product is in stock, the usual delivery time is 2 to 5 working days.
-If the product is out of stock, the delivery time is 7 to 15 working days.
All our products come with the manufacturer's official warranty and comply with current regulations.
Yes. We ship orders to Spain and most European countries using specialized transport agencies.
You can contact our team via WhatsApp, email, or our website's contact form.
Shipping costs depend on the type of product, its weight, dimensions, and the destination country. In most cases, the amount is calculated automatically during the checkout process before the order is finalized.
For some products, especially large items or those with special characteristics, shipping costs may require a manual review. If the amount shown does not match the actual shipping cost, we will contact you before processing the order to inform you of the final cost and request your confirmation before proceeding. We will never charge any additional fees without your authorization.