Klunk !!!!!!!!!!!

TX_370 · 02-10-2010, 01:00 PM

Quote:

Originally Posted by AK370Z

It's annoying I know but it's normal. We all hear this clunk everyday. 350Z had this clunk as well.

Slynky · 02-10-2010, 01:42 PM

Must be where the word, "clunker" came from...

:hides:

vipor · 02-10-2010, 02:06 PM

NYBladeZ · 02-10-2010, 02:12 PM

Quote:

Originally Posted by j.arnaldo

On the other hand, ATs are flawless, for the benefit of those who prefer auto trannies.

Man who drives the AT may be a bit faster, but the man driving the MT is having way more fun

JvKintheUSA · 02-10-2010, 03:22 PM

I had this clunk fixed at the dealer. They replaced the rear drive shafts and the clunk was gone. That was 4k miles ago. Now it is doing it again. Happens only when I backup or accelerate from a stop - clearly audible when you are parked in a garage. Sounds like there is play in the driveline. I'm afraid it will get worse over time. When I went to a Z meet in VA in August, several other 370Zs made the same noise, but no one there thought it was a big deal. I found this somewhere online:

Clunk
Clunk is a metallic noise heard when an automatic transmission is engaged in Reverse or Drive, or when throttle is applied or released. It is caused by backlash somewhere in the driveline, but not necessarily in the axle.

ChrisSlicks · 02-10-2010, 04:08 PM

There is a clutch clunk and then there is the rear-end clunk that you are talking about. The rear-end clunk could be slop in the pinion gear, or axle side shafts. My old Datsun had major slop clunk from the diff, eventually I completely destroyed the rear-end trying to launch it.

JvKintheUSA · 02-10-2010, 04:25 PM

Yeah it is in the rear-end. I am so surprised that no one else is complaining about that or think that it is normal. It is not. I can see the differential go out of business right outside the warranty period.

khtso · 02-10-2010, 05:03 PM

I have the same problem. It is actually quite a loud clunk. It is most noticeable when disengaging the clutch in first gear on a hill when the car is cold. (I have to go up a slope when exiting my parking garage). I've read that someone here took it in and the dealer rotated the drive shaft 180 degrees and coated it with grease, which fixed the problem temporarily. I haven't done this.

Slynky · 02-10-2010, 05:38 PM

Quote:

Originally Posted by JvKintheUSA

I had this clunk fixed at the dealer. They replaced the rear drive shafts and the clunk was gone. That was 4k miles ago. Now it is doing it again. Happens only when I backup or accelerate from a stop - clearly audible when you are parked in a garage. Sounds like there is play in the driveline. I'm afraid it will get worse over time. When I went to a Z meet in VA in August, several other 370Zs made the same noise, but no one there thought it was a big deal. I found this somewhere online:

Clunk
Clunk is a metallic noise heard when an automatic transmission is engaged in Reverse or Drive, or when throttle is applied or released. It is caused by backlash somewhere in the driveline, but not necessarily in the axle.

Remembering the old days when I did a LOT more on cars than I do now, I'd say this sort of thing could be universal joint play. Those were things that had to be replaced sometimes in cars. I'd say the more powerful the engine and the more it is driven in a, hmmmm, spirited mode (

), the more wear and tear it makes on those joints but I wouldn't expect it to show up till 50,000 or 100,000 miles. Dunno...

Slynky · 02-10-2010, 05:40 PM

Hope you guys aren't getting drive shaft (singular) confused with axles...

ChrisSlicks · 02-10-2010, 06:45 PM

The axle half-shafts have universal joints as well. The drive-shaft universal joint is a pretty sturdy piece so I wouldn't expect any failure there for a long long time.

Spec Jay · 02-16-2010, 10:09 PM

Quote:

Originally Posted by ChrisSlicks

The axle half-shafts have universal joints as well. The drive-shaft universal joint is a pretty sturdy piece so I wouldn't expect any failure there for a long long time.

half shafts have CV joints.

serturbo · 02-17-2010, 12:58 AM

I'm guessing some people's clunks could be due to driving style and timing. The Z is throttle by wire, so there is a lag between pedal action and the throttle plate reacting. If you drive the Z like a car without throttle by wire, the tranny will still be under load when you depress the clutch. I found this to lead to my clunking. I just changed my foot timing a little and no clunks.

NISSNISS370Z · 02-17-2010, 02:16 PM

when i went to the dealership to bring this problem to there attention they said it was "normal".....also he said that there wasn't a recall but there was a bullitin sent out saying that the bolts in the rear-end had to be re-torqued to a higher pound. this wasnt the case for my car.

B1nks · 02-17-2010, 06:40 PM

Quote:

Originally Posted by JvKintheUSA

Yeah it is in the rear-end. I am so surprised that no one else is complaining about that or think that it is normal. It is not. I can see the differential go out of business right outside the warranty period.

Does this mean an aftermarket differential will help alleviate the problem ?

02-10-2010, 01:42 PM	#17 (permalink)
Slynky Track Member Join Date: Oct 2009 Location: McDonough, GA Posts: 595 Drives: 2010 Red 370Z T/S/N Rep Power: 16	Must be where the word, "clunker" came from... :hides: __________________ A veteran is someone who, at one point in their life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including my life."

02-10-2010, 02:06 PM	#18 (permalink)
vipor A True Z Fanatic Join Date: Aug 2009 Location: Euless, TX [ DFW ] Age: 41 Posts: 13,531 Drives: Nismo 09-0183 QAB Rep Power: 48	__________________ 2009 NISMO # 0193 \| QAB \| Albums! \| 05.04.10 (Dynojet) 291.94hp/248.28tq Oil Cooler (DIY) \| Custom Headlights \| GTSPEC Braces \| F.I. Long Tube Headers

02-10-2010, 03:22 PM	#20 (permalink)
JvKintheUSA Enthusiast Member Join Date: Jun 2009 Location: Canton, GA Posts: 465 Drives: 2013 Shelby GT500 Rep Power: 427	I had this clunk fixed at the dealer. They replaced the rear drive shafts and the clunk was gone. That was 4k miles ago. Now it is doing it again. Happens only when I backup or accelerate from a stop - clearly audible when you are parked in a garage. Sounds like there is play in the driveline. I'm afraid it will get worse over time. When I went to a Z meet in VA in August, several other 370Zs made the same noise, but no one there thought it was a big deal. I found this somewhere online: Clunk Clunk is a metallic noise heard when an automatic transmission is engaged in Reverse or Drive, or when throttle is applied or released. It is caused by backlash somewhere in the driveline, but not necessarily in the axle. __________________

02-10-2010, 04:25 PM	#22 (permalink)
JvKintheUSA Enthusiast Member Join Date: Jun 2009 Location: Canton, GA Posts: 465 Drives: 2013 Shelby GT500 Rep Power: 427	Yeah it is in the rear-end. I am so surprised that no one else is complaining about that or think that it is normal. It is not. I can see the differential go out of business right outside the warranty period. __________________

02-10-2010, 05:40 PM	#25 (permalink)
Slynky Track Member Join Date: Oct 2009 Location: McDonough, GA Posts: 595 Drives: 2010 Red 370Z T/S/N Rep Power: 16	Hope you guys aren't getting drive shaft (singular) confused with axles... __________________ A veteran is someone who, at one point in their life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including my life."

02-10-2010, 04:08 PM	#21 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	There is a clutch clunk and then there is the rear-end clunk that you are talking about. The rear-end clunk could be slop in the pinion gear, or axle side shafts. My old Datsun had major slop clunk from the diff, eventually I completely destroyed the rear-end trying to launch it.

02-10-2010, 05:03 PM	#23 (permalink)
khtso Base Member Join Date: May 2009 Location: Los Angeles Posts: 59 Drives: 2009 370Z Rep Power: 16	I have the same problem. It is actually quite a loud clunk. It is most noticeable when disengaging the clutch in first gear on a hill when the car is cold. (I have to go up a slope when exiting my parking garage). I've read that someone here took it in and the dealer rotated the drive shaft 180 degrees and coated it with grease, which fixed the problem temporarily. I haven't done this.

02-10-2010, 06:45 PM	#26 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	The axle half-shafts have universal joints as well. The drive-shaft universal joint is a pretty sturdy piece so I wouldn't expect any failure there for a long long time.

02-17-2010, 12:58 AM	#28 (permalink)
serturbo Base Member Join Date: Jan 2010 Location: Kauai, HI Posts: 77 Drives: 10 370Z Sport Rep Power: 15	I'm guessing some people's clunks could be due to driving style and timing. The Z is throttle by wire, so there is a lag between pedal action and the throttle plate reacting. If you drive the Z like a car without throttle by wire, the tranny will still be under load when you depress the clutch. I found this to lead to my clunking. I just changed my foot timing a little and no clunks.

02-17-2010, 02:16 PM	#29 (permalink)
NISSNISS370Z Base Member Join Date: Jan 2010 Location: orange county Posts: 87 Drives: 09 Nissan 370Z Rep Power: 15	when i went to the dealership to bring this problem to there attention they said it was "normal".....also he said that there wasn't a recall but there was a bullitin sent out saying that the bolts in the rear-end had to be re-torqued to a higher pound. this wasnt the case for my car.