Clunk from rear when engaging gear from standstill

Pharmacist · 11-01-2010, 10:58 PM

Does anyone hear a bit of a clunk from the back of the car from what appears to be the diff or axles when trying to shift into 1st from neutral at a standstill? The sound is most obvious if trying to get into gear quickly immediately after pressing the clutch when he input shaft of the gearbox is still rotating. If you wait a couple of seconds till the input shaft stops you dont hear the sound. The sound also occurs if trying to get into 2nd from neutral at a standstill.

ImportConvert · 11-01-2010, 11:35 PM

Understand that correct back-lash for gears is around .006 at the very tightest, and usually around .007-.012 IIRC.

This is definitely enough distance to hear a bit of a clunk from, especially when you factor U-joint, slip-yoke, and all the gears in the transmission ALSO have a bit of slop in them (if they didn't, the car wouldn't be going anywhere). You probably have around .25-.5" of slop in the drive-line or more, easily. Maybe even more. I wouldn't worry about it.

Pharmacist · 11-02-2010, 12:02 AM

So thats normal? I was afraid i had excessive wear on the diff or something

ImportConvert · 11-02-2010, 12:09 AM

Quote:

Originally Posted by Pharmacist

So thats normal? I was afraid i had excessive wear on the diff or something

Very doubtful.

Worry about whining, not clunking.

kenchan · 11-02-2010, 08:28 AM

I hear my gearbox when i enter the gate but not the diff.

AllForTheCash · 11-02-2010, 06:12 PM

No clunk here at standstill.

Smallywood · 11-02-2010, 06:43 PM

No issues here either. I'd have the dealership check it out.

11-01-2010, 10:58 PM	#1 (permalink)
Pharmacist A True Z Fanatic Join Date: May 2009 Location: Toronto, Ontario Posts: 1,249 Drives: 09 370z Sport 6MT Rep Power: 17	Clunk from rear when engaging gear from standstill Does anyone hear a bit of a clunk from the back of the car from what appears to be the diff or axles when trying to shift into 1st from neutral at a standstill? The sound is most obvious if trying to get into gear quickly immediately after pressing the clutch when he input shaft of the gearbox is still rotating. If you wait a couple of seconds till the input shaft stops you dont hear the sound. The sound also occurs if trying to get into 2nd from neutral at a standstill. __________________ 2009 370z Sport Touring/Nismo shift Knob/Z1 motorsports 34 row oil cooler

11-02-2010, 12:02 AM	#3 (permalink)
Pharmacist A True Z Fanatic Join Date: May 2009 Location: Toronto, Ontario Posts: 1,249 Drives: 09 370z Sport 6MT Rep Power: 17	So thats normal? I was afraid i had excessive wear on the diff or something __________________ 2009 370z Sport Touring/Nismo shift Knob/Z1 motorsports 34 row oil cooler

11-02-2010, 06:12 PM	#6 (permalink)
AllForTheCash Enthusiast Member Join Date: Sep 2010 Location: NJ Posts: 385 Drives: 370z Rep Power: 14	No clunk here at standstill. __________________ 2010 370z Brilliant Silver/Frost - Touring - Sport - Navigation - 6MT

11-02-2010, 06:43 PM	#7 (permalink)
Smallywood Track Member Join Date: Jul 2009 Location: Central Ohio Posts: 501 Drives: 12 GT-R BlackEdition Rep Power: 16	No issues here either. I'd have the dealership check it out. __________________

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
2nd gear clunk, rubbing, grind	spinhead	Engine & Drivetrain	31	04-06-2017 04:29 AM
Rear Axle Clunk (Please Report Here!)	RedZed34	Engine & Drivetrain	102	01-23-2017 04:51 PM
how do i get rid of the standstill rev limiter?	Richie	Nissan 370Z General Discussions	3	04-21-2010 08:10 PM
VDC engaging under acceleration?	gh0st3794	Engine & Drivetrain	16	02-22-2010 01:42 PM
Rear end gear grinding	dthem370	Nissan 370Z General Discussions	4	01-28-2010 08:09 AM

11-01-2010, 11:35 PM	#2 (permalink)
ImportConvert A True Z Fanatic Join Date: Jun 2010 Location: SWMO Posts: 4,454 Drives: 2019 CX5 GT Reserve Rep Power: 7626	Understand that correct back-lash for gears is around .006 at the very tightest, and usually around .007-.012 IIRC. This is definitely enough distance to hear a bit of a clunk from, especially when you factor U-joint, slip-yoke, and all the gears in the transmission ALSO have a bit of slop in them (if they didn't, the car wouldn't be going anywhere). You probably have around .25-.5" of slop in the drive-line or more, easily. Maybe even more. I wouldn't worry about it.

11-02-2010, 08:28 AM	#5 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	I hear my gearbox when i enter the gate but not the diff.