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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Aug-03-2017, 03:04:39 PM   #1
Kdubski
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Default Differential Bushings

My bushings are starting to develop play and deciding if now is a good chance to upgrade to poly. I am a purist and prefer OEM bushings in all other regards, however, I feel as if the differential might be a place where poly may have a place (increased throttle feel).

Anyone with experience care to chime in?
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Old Thu, Aug-03-2017, 03:09:38 PM   #2
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Default Re: Differential Bushings

After having 2 sets of poly, I would go Oem, unless you're doing serious track duty. They add a lot of noise when it comes to shifting, putting the car into gear, ect. Only reason I went poly is because oem is a PITA to install the front one. Theres a lot of threads that talk about the pros and cons of poly.


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Old Thu, Aug-03-2017, 03:39:28 PM   #3
TboneM3
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Default Re: Differential Bushings

I do feel a stronger "directness" from my pedal to the wheels since going with poly, and I appreciate it, but I don't love the NVH or slight whine at 60mph+, but I'll live.

If it's a DD, I'd stick with OE rubber.
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Old Thu, Aug-03-2017, 03:55:47 PM   #4
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Default Re: Differential Bushings

What type of poly's are you guys running? Reading that there are some registering 70A on hardness scale (powerflex street), which is "slightly" harder than OEM.

Car will see some autocross once all maintenance addressed and sub frame reinforced.
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Old Thu, Aug-03-2017, 04:05:42 PM   #5
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Default Re: Differential Bushings

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Originally Posted by Kdubski View Post
What type of poly's are you guys running? Reading that there are some registering 70A on hardness scale (powerflex street), which is "slightly" harder than OEM.

Car will see some autocross once all maintenance addressed and sub frame reinforced.


I first ran 75A revshifts which was their oem+ option. Bit mistake. The front one slipped out. I am now running AKG 95A which I know lots of guys are running.
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Old Thu, Aug-03-2017, 04:09:28 PM   #6
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Default Re: Differential Bushings

ecs makes a nice 80A poly. That's just above the rubber durometer value.

I've run all 75D and it was noisy. Not like pop and rattle noisy...but there was a slight whine at highway speeds and engaging gears was all metal to metal noise...there was no give at all anymore.

I replaced the diff in the car and kept the front bushing 75D with the rear oem...that helped a lot with the nvh.

Note that I have all 95A on my e36 diff with aluminum subframe and its just as civil as before. It has a lot to do with the make up of the drivetrain. I bet if you got an aftermarket diff with better tolerances, you would not really notice a harder diff bushing. Its all how far you want to go. You cant ever go wrong with OEM.
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Old Thu, Aug-03-2017, 05:53:17 PM   #7
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Default Re: Differential Bushings

AKG 90 or 95A, can't remember.
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Evolve-R eVenturi Euro Headers|sect 1 OM Scorza sect 3 OE CSL trunk D/A pullies/fan delete TMS Camber/Sub plates RE Street Trans Mounts
Besian AKG poly SUB/DIFF SDW RTAB ZHP knob + UUC DSSR TMS Sway GroundControl S/A (Koni/Eibach 440/550) + tall RSMs APEX 75mm Studs
Sportline 8S 18x8.5/9.5" PSS 245/275 Goodridge SS lines Pioneer DEH-80PRS Eclipse PA5422 CDT HD-6 + WS-100i CDT EX-530 8" Kicker

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Old Thu, Aug-03-2017, 06:47:20 PM   #8
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Default Re: Differential Bushings

If the car sees any street use at all, I'd stick with OE. There's very little performance benefit to aftermarket (oe is quite rigid) and tons of NHV trade off with any of the aftermarket options.
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Old Thu, Aug-03-2017, 07:03:27 PM   #9
JaredMV
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Default Re: Differential Bushings

Quote:
Originally Posted by Kdubski View Post
My bushings are starting to develop play and deciding if now is a good chance to upgrade to poly. I am a purist and prefer OEM bushings in all other regards, however, I feel as if the differential might be a place where poly may have a place (increased throttle feel).

Anyone with experience care to chime in?
If you're a purist, go with OEM. If you actually care about gaining tiny bits of performance and don't mind the noise, go poly like me.
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Old Thu, Aug-03-2017, 07:16:37 PM   #10
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Default Re: Differential Bushings

I have AKG bushings black and I daily it.
This is no extra noise besides a DIFF whine which I love, and i wish it was louder.

I have some REVshift Diff bushings for sale... pm me if interested.

OEM are 75
Revshift are 80
AKG are 90/95

So it is a mild upgrade
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Discussing Differential Bushings in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)