About Us

Built to Your Exact Specifications

Whether you demand performance on the street or the track, Diffsonline can provide you with the performance BMW differentials to suit your exact needs. Every differential is built to your exact specifications in our shop, and shipped to your door.

We have differentials for the new BMW F-Series Cars IN STOCK. These are very difficult to find, so give us a call to build yours now!

We specialize in top quality BMW custom differentials. All of our differential options are outlined with full pricing in our products area of the web site. Don't see what your looking for, call us at 800.219.0485 or Email Dan to get your questions answered quickly and honestly.

What We Do

Whether you're looking to alter the final drive gear ratio, or add limited-slip functionality to get all that power to the ground in the turns, we've got the knowledge to guide you in the right direction.

Differentials

Whether you demand performance on the street or the track, Diffsonline can provide you with a performance differential to suit your exact needs. Every differential is built to your exact specifications in our shop, and shipped to your door.

Parts

Looking for parts to fix your worn or broken differential, we have them! If you don't see exactly what you want or need, email us and we will get you up and running again.

Transmissions

We offer transmissions for street and race applicatons.

Technical Resources

Visit our Technical Information page for our Gearing Calculator, technical specifications, break-in instructions, and more.

Rebuild Kits

All you need to refresh all bearings and seals for your BMW differential.

REM® Polishing

REM® Bearing Polishing and REM® Ring & Pinion Polishing reduces friction, heat, and wear inside your differential.

"All of my future BMW differentials will come from diffsonline."

I went with a 3.64 3 Clutch setup with 45/45 ramps for my E46 ZHP. It completely changed the driving dynamics of my car. Throttle steering is now predictable, corner exit speeds have increased, snow traction is incredible, and the fun factor is priceless.

The best part = it feels like a OEM BMW differential. All of my future BMW differentials will come from diffsonline.

Wyatt Gilbert, Motion Control Suspension