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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 Fri, Aug-16-2019, 07:03:57 PM   #11
scaley
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Default Re: PSA: check your front diff bolt

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Originally Posted by antknee View Post
I reversed the car onto my raceramps. Supported the diff w/ my jack. Removed the 8mm nut from the center of the plastic belly pan (there was a piece of plastic protruding up, getting in the way a bit if you don't remove this nut). From there I took a 13/16 socket w/ long extension, and was able to tighten the front diff bolt from doing just that.
I will try it again and report back, but I remember the brace which covers both front subframe bushings being right in the way of giving me a straight angle onto the bolt. I remember thinking how it'd be impossible to fully tighten that front diff bolt without dropping the entire subframe and then tightening it. Maybe I'm just dumb and completely missed something. I'll try it again.
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Old Fri, Aug-16-2019, 07:08:58 PM   #12
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Default Re: PSA: check your front diff bolt

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Originally Posted by mrgizmo04 View Post
It might not solve the "mclunk" because there could be a lot of other parts like halfshafts, actual diff backlash, diff clutches, driveshaft joints, etc making noise.

Separately, you should not need ujoints at all, there is a pretty open straight shot. You should not even need to remove the v brace. If you remove the v brace and the plastic cover on pass side, 21mm socket and an a small extension is all that is needed. Possibly that your the head of your torque wrench is large, but with the right extension length you can fit it in without removing anything else.

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I'm hoping it solves my M-clunk because it's the easiest and cheapest option lol. I'm planning on upgrading to a 4.10 Diffsonline diff in the future but until I save up enough for it I would love to fix my clunking stock diff. I have already replaced every bushing in the rear end when I reinforced the floor along with my CSB so I know it's none of that causing the issue. I will try tightening the bolt again and see if I have better luck.
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Old Fri, Aug-16-2019, 07:55:50 PM   #13
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Default Re: PSA: check your front diff bolt

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Originally Posted by scaley View Post
I'm hoping it solves my M-clunk because it's the easiest and cheapest option lol. I'm planning on upgrading to a 4.10 Diffsonline diff in the future but until I save up enough for it I would love to fix my clunking stock diff. I have already replaced every bushing in the rear end when I reinforced the floor along with my CSB so I know it's none of that causing the issue. I will try tightening the bolt again and see if I have better luck.
By design, the diff on m3 will clunk - clutch design of lsd unit, different length between output shafts on driver vs passenger side and to extent the backlash.

I have Dan's 4.10 unit and it did not solve any clunking.

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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, stock S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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Old Fri, Aug-16-2019, 08:19:46 PM   #14
scaley
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Default Re: PSA: check your front diff bolt

Quote:
Originally Posted by mrgizmo04 View Post
By design, the diff on m3 will clunk - clutch design of lsd unit, different length between output shafts on driver vs passenger side and to extent the backlash.

I have Dan's 4.10 unit and it did not solve any clunking.

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Did you keep the viscous LSD setup and just have him replace the R&P? I am planning on having him replace mine with a 2 clutch or 3 clutch setup to get away altogether from the clunking of the factory diff setup.
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Old Fri, Aug-16-2019, 10:43:34 PM   #15
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Default Re: PSA: check your front diff bolt

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Originally Posted by scaley View Post
Did you keep the viscous LSD setup and just have him replace the R&P? I am planning on having him replace mine with a 2 clutch or 3 clutch setup to get away altogether from the clunking of the factory diff setup.
Yes, I kept the factory LSD unit.

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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, stock S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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Old Fri, Aug-16-2019, 11:03:42 PM   #16
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Default Re: PSA: check your front diff bolt

Front diff bolt part number?
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Old Fri, Aug-16-2019, 11:54:45 PM   #17
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Default Re: PSA: check your front diff bolt

How did you guys even remove the rear bolts? I don't have enough clearance to take mine out because that spare tire hump is in the way.
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Old Sat, Aug-17-2019, 12:59:41 AM   #18
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Default Re: PSA: check your front diff bolt

The e46 m3 doesn’t have a spare tire.


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Old Sat, Aug-17-2019, 01:01:10 AM   #19
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Default Re: PSA: check your front diff bolt

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Originally Posted by nujav View Post
How did you guys even remove the rear bolts? I don't have enough clearance to take mine out because that spare tire hump is in the way.
Socket/ratchet with a swivel to break it loose, then open end wrench and some patience. I swapped my diff cover/bushings recently, not too bad.

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__________________
'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, stock S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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Old Sat, Aug-17-2019, 01:03:39 AM   #20
mrgizmo04
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Default Re: PSA: check your front diff bolt

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Originally Posted by WoGGo View Post
Front diff bolt part number?
33177840535 about $20

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__________________
'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, stock S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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Discussing PSA: check your front diff bolt 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)