Build a bear *differential*

[fattycharged]

Yes its currently making a loud whining noise kind of sounds like a wind up toy but it still drives excellent.... had the AKG rear diff bushings put in 2 months ago along with fresh factory fluids in rear diff... keep the comments coming appreciate it and its reassuring to see the different options I can go with

a lot of that whine is likely related to those new diff bushings, they add substantial NVH

[x X Cloud X x]

Weather is finally getting warmer going to jump the battery in the M and take it out this Fri. for the first time since last summer with that dreaded whine, hopefully it’s just the new AKG bushings causing that noise and not the diff going bad 😬

[01SG]

FWIW, I just cracked 160k and my diff is still working well enough with no noise. It has been through 70k of fairly hard driving with me, including a number of trips around Lime Rock Park. I will say I never, ever launch the car though. First gear is just for getting moving. Stock diff bushings.

[Ramo]

I get diff whine in gear OFF throttle but No whine off throttle in neutral. Is it the bearings as well? OE bushings.

[Obioban]

I assume you are on stock fluid, with FM booster? Stock diff is notorious for whining with anything else.

Failing like that, wavertrac is great for a street/track car. Silent, predicable, easy, no clutches to wear out.

[fattycharged]

I assume you are on stock fluid, with FM booster? Stock diff is notorious for whining with anything else.

Failing like that, wavertrac is great for a street/track car. Silent, predicable, easy, no clutches to wear out.

I think this may be the move for my V2 diff, just swap to a wavetrac


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[sapote]

FWIW, I just cracked 160k and my diff is still working well enough with no noise. It has been through 70k of fairly hard driving with me, including a number of trips around Lime Rock Park. I will say I never, ever launch the car though. First gear is just for getting moving. Stock diff bushings.

V1 or V2 diff, or what is yours build month/year?

[Obioban]

I also never had any issues with the stock diff— either in the first 160,000 miles of life in my m3 coupe, with track time, or the 230,000 miles in the m3 wagon (almost entirely street use).

Both V2’s. Both with real fluid change intervals 😜

[01SG]

V1 or V2 diff, or what is yours build month/year?

V1, it's a 2001 car.

[sapote]

I also never had any issues with the stock diff— either in the first 160,000 miles of life in my m3 coupe, with track time, or the 230,000 miles in the m3 wagon (almost entirely street use).

Both V2’s. Both with real fluid change intervals 😜

The only issue with the stock diff is the M clunk which mainly happens at moving from stop. My 87K miles V2 already has this issue. The bearings and pinion/ring are stout.

[Obioban]

The only issue with the stock diff is the M clunk which mainly happens at moving from stop. My 87K miles V2 already has this issue. The bearings and pinion/ring are stout.

My v2 had the clunk when I picked up the car with 2 miles on it. Don’t think it’s an issue so much as a design choice.