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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, Dec-29-2017, 02:36:55 AM   #51
dothraki
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Default Re: Adjusting Diff backlash

I'm a bit confused. Is the clunk folks are experiencing the same as backlash? This thread seems to be mingling both.

I recently had my LSD oil changed and while I don't hear any odd noise or have any metal clunking, I feel the car does have backlash. When I shift gears, there is a momentary jolt (backlash?) after the clutch is let off in 1st->2nd->3rd->4th. This is not the jolt where one lets off the clutch too early, but it may feel like that for the passenger. The jolt is proportional to how hard and fast I accelerate and if I'm carrying passengers, the feeling for them is like I can't shift. Is this backlash?
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Old Fri, Dec-29-2017, 02:59:09 AM   #52
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Default Re: Adjusting Diff backlash

I haven't read the whole thread, but I think your basic premise is off. Pros have indicated a lot of the problem is in the LSD pack.
Furthermore, backlash isn't something to take on the first time without someone with experience watching/helping. ESPECIALLY on a worn-in gear set. The most likely outcome is you are going to end up with a gear whine or worse, and you won't have fixed the clunk.
I don't mean to be negative here, but even pros get some of these wrong; there are specs, and then there is experience and "feel" to doing diffs.
It's kind of like using shims or a mic the first time, it takes time to develop the feel. It does take some pressure, but as we like to joke newbies, "it's not a c-clamp"!

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Old Sat, Dec-30-2017, 01:20:25 AM   #53
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Default Re: Adjusting Diff backlash

"Backlash" is a generic term describing play between gears, also can be used to describe play in any mechanism.
But regarding differential/final drive assemblies, it's used to specifically describe the clearance between the ring gear and pinion.
Sorry for the confusing terms.
In my opinion... much of the infamous 'm clunk' can be attributed to excess clearance (or "backlash...") between the spider gears inside the LSD carrier. NOT typically from excess backlash between the ring and pinion.
Proper ring and pinion backlash is critical to final drive lifespan, and not something to be dicked with...
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Old Mon, Feb-19-2018, 11:31:19 PM   #54
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Default Re: Adjusting Diff backlash

Sorry for being out of touch with this thread. But my issue ended up being a bad drive shaft cv joint. Replaced the joint, greased it and the clunk is gone. Luckily i found that out before i replaced (or damaged) my diff.



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Discussing Adjusting Diff backlash 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)