Attention all 6 speed owners!!

[S65V8]

yep, normal...

[mshab356]

So I got my car checked out at the dealership yesterday. Turns out it was a sheared off differential bolt. That explains the clunking noise; the diff was shifting back and forth when the car would speed up/slow down. It is all fixed now so I'm happy. Has this happened to anyone else before? I feel like if I pay this much for a car, something this absurd shouldn't happen, especially 6000 miles in lol...

[midlifecrisis]

It's probably not a bad thing that the diff bolts are the weak link in the system. It's easier to replace them than a lot of other parts that could fail if over-stressed.

I wonder about my drivetrain, as well. My daily commute is pretty short, and I've had to merge quickly into rush hour traffic on a regular basis. I wouldn't be surprised if the cold engine bucking has caused some bolts to weaken. I'll have to get it on a lift and check it out. Does anyone know if a broken diff bolt will be obvious or do you have to put some leverage on it to detect a problem?

[mshab356]

Originally Posted by midlifecrisis

It's probably not a bad thing that the diff bolts are the weak link in the system. It's easier to replace them than a lot of other parts that could fail if over-stressed.

I wonder about my drivetrain, as well. My daily commute is pretty short, and I've had to merge quickly into rush hour traffic on a regular basis. I wouldn't be surprised if the cold engine bucking has caused some bolts to weaken. I'll have to get it on a lift and check it out. Does anyone know if a broken diff bolt will be obvious or do you have to put some leverage on it to detect a problem?

Mine was very noticeable audibly (loud clunking noises that didn't sound normal), and when I looked under the car, the diff was hanging lower on one side.

[stefan]

Wow add another to the list. Glad you got it taken care of.

No mods, correct?

[SPEED & TECH MOTORING]

it's only between 1st and 2nd. also like you have mentioned it's not grinding noise. I have driven 6 speed gallardo(S) and they make it even louder. NO biggie. keep rowing.

[nyfg56]

Bringing this thread back. I'm getting what I think guys are describing, the metal clunking sound. It sis the exact sound in the video on this thread. Just got my e90 home from private seller. Someone please help advise what this could be!

http://www.m3post.com/forums/showthread.php?t=871122

[squartus]

Originally Posted by nyfg56

Bringing this thread back. I'm getting what I think guys are describing, the metal clunking sound. It sis the exact sound in the video on this thread. Just got my e90 home from private seller. Someone please help advise what this could be!

http://www.m3post.com/forums/showthread.php?t=871122

Check you rear diff bolts, with the squishy OEM mounts they like to wiggle around/get loose/snap. Snapped mine on way home about 2 years ago and fixed it with solid mounts. Was clunking before hand

[nyfg56]

Originally Posted by squartus

Check you rear diff bolts, with the squishy OEM mounts they like to wiggle around/get loose/snap. Snapped mine on way home about 2 years ago and fixed it with solid mounts. Was clunking before hand

Currently getting it fixed. Ended up being my drive shaft like others have had

[eddunn]

Originally Posted by squartus

Check you rear diff bolts, with the squishy OEM mounts they like to wiggle around/get loose/snap. Snapped mine on way home about 2 years ago and fixed it with solid mounts. Was clunking before hand

What solid mounts did you use? Have you also installed solid subframe mounts? I've horror stories about the NVH, but I think most people are just pussies.

[squartus]

Originally Posted by eddunn

What solid mounts did you use? Have you also installed solid subframe mounts? I've horror stories about the NVH, but I think most people are just pussies.

Didnt mess with subframe yet, my diff mounts are derlin and yes the NVH is VERY noticable even over supercharger/loud exhaust. Its the pitch of the whine that makes it annoying, kinda cuts through everything. Iv lived with it for over 2 years but you always know its there, id go a different route if had to do over again or if I ever pull the rear end out of my car again.