Clunk from rear when engaging gear from standstill

Pharmacist · 11-01-2010, 11:58 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 · 11-02-2010, 12:35 AM

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, 01:02 AM

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

ImportConvert · 11-02-2010, 01:09 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, 09:28 AM

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

AllForTheCash · 11-02-2010, 07:12 PM

No clunk here at standstill.

Smallywood · 11-02-2010, 07:43 PM

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

11-01-2010, 11:58 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: 18	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, 01:02 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: 18	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, 07:12 PM	#6 (permalink)
AllForTheCash Enthusiast Member Join Date: Sep 2010 Location: NJ Posts: 385 Drives: 370z Rep Power: 15	No clunk here at standstill. __________________ 2010 370z Brilliant Silver/Frost - Touring - Sport - Navigation - 6MT

11-02-2010, 07:43 PM	#7 (permalink)
Smallywood Track Member Join Date: Jul 2009 Location: Central Ohio Posts: 501 Drives: 12 GT-R BlackEdition Rep Power: 17	No issues here either. I'd have the dealership check it out. __________________

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11-02-2010, 12:35 AM	#2 (permalink)
ImportConvert A True Z Fanatic Join Date: Jun 2010 Location: SWMO Posts: 4,454 Drives: 2019 CX5 GT Reserve Rep Power: 7627	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, 09:28 AM	#5 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	I hear my gearbox when i enter the gate but not the diff.