So this is new

**josh.smuin1** · 03-24-2014 11:37 AM

My rear diff locked up on me on the freeway at about 65 mph .. No sighns of trouble before, no leaks, no grime built up... What the? Anyone else have diff problems ?

And the "glamour" shot. First time my b5 has seen a trailer

Sent from my iPhone using Tapatalk

**redline380** · 03-24-2014 11:51 AM

how sure are you that it was the rear diff?

**josh.smuin1** · 03-24-2014 12:41 PM

Has to pull cv axles and driveline to get it on a trailer, diff is locked

Sent from my iPhone using Tapatalk

**redline380** · 03-24-2014 12:42 PM

Sure it isn't the center diff?

**demonmk2** · 03-24-2014 04:27 PM

Keep us up to date...I'm with redline, center diff.

**josh.smuin1** · 03-24-2014 07:25 PM

Originally Posted by redline380

Sure it isn't the center diff?

Well I pulled the diff out, and managed to tear it down some. Btw what a PITA ! Anyway it is indeed the center diff. Anyone have any suggestions to a company that makes parts for our differentials ?

Sent from my iPhone using Tapatalk

**redline380** · 03-24-2014 07:27 PM

Originally Posted by josh.smuin1

Anyone have any suggestions to a company that makes parts for our differentials ?

Yeah, the junkyard lol

Edit- what are you running for tires?

**josh.smuin1** · 03-24-2014 07:34 PM

Originally Posted by redline380

Yeah, the junkyard lol

Edit- what are you running for tires?

I am running falken 225/40/18 on bbs rc's. No spacers

Sent from my iPhone using Tapatalk

**RallyeBourne** · 03-25-2014 09:08 AM

In your situation, I'd contact JHMotorsports about a center diff. 4:1 FTW.

**josh.smuin1** · 03-25-2014 12:41 PM

Originally Posted by RallyeBourne

In your situation, I'd contact JHMotorsports about a center diff. 4:1 FTW.

But wouldn't that mean changing the final drive ratio in the transmission?

Sent from my iPhone using Tapatalk

**fed0ra** · 03-25-2014 12:54 PM

No, the 4:1 doesn't refer to the final drive, it refers to the power split. Basically you can have 80% of the power go to front or rear. Can't remember what the ratio is stock.

**BaseDrifter** · 03-25-2014 12:56 PM

Originally Posted by josh.smuin1

But wouldn't that mean changing the final drive ratio in the transmission?

Sent from my iPhone using Tapatalk

No. The center differential is responsible for distributing torque to the front and rear wheels.

JHM describes it best:

The factory torsen center differential in the S4 and A4 provides a 2:1 torque distribution between front and rear. What does this mean? This enables the end of the car that still has traction (most of the time the rear) to deliver double the torque to the tires with traction. JHM's experience has found that this closer to even distribution is best for drag racing. So this modification is not for you if you are into drag racing primarily. However for Auto Crossers, Road racers and others who prefer the twisties JHM recommends a bias ratio of 4:1. This is the same bias ratio that Audi has provided in the stock RS4 driveline.

http://jhmotorsports.com/shop/catalo...only-p-46.html

**redline380** · 03-25-2014 12:58 PM

Originally Posted by fed0ra

No, the 4:1 doesn't refer to the final drive, it refers to the power split. Basically you can have 80% of the power go to front or rear. Can't remember what the ratio is stock.

I'm like 99.9999999% sure it is 50:50. Newer ones are 60:40