5th gear "crunching" with shift

ZOperaMan · 06-20-2010, 08:38 PM

...this after about 8600 miles.

First time I noticed the grind was after a quick 1-2 upshift, then quickly laying off the throttle, shifting rapidly into from 2nd to 5th - ggrrrinddd.

Now after reading this thread, I'm dreading. I have experimented a bit, and the grind only happens when shifting to 5th from ANY other gear quickly (up or down). Does not seem to matter how well I depress the clutch. It works fine if I wait a second or so for the gears to sync.

It also seems to lessen the chance of grinding if I slant the 4-5 upshift more diagonally "/", rather than "N"-shaped, if you know what I mean. I'm just disappointed that I have to wait longer to snap into 5th than any other gear now. Other combinations that skip, like 3-6, and 1-3 seem to work fine.

ZOperaMan · 01-17-2012, 01:12 PM

Just wanted to update here:

Car now has about 33K miles, and 5th gear grind the same. Took it my dealer, who diagnosed it as synchronizers (as expected). New transmission on the way!

Alchemy · 01-17-2012, 01:40 PM

Quote:

Originally Posted by ZOperaMan

Just wanted to update here:

Car now has about 33K miles, and 5th gear grind the same. Took it my dealer, who diagnosed it as synchronizers (as expected). New transmission on the way!

I really need to get my Z looked at. I still get an occasional grind in 5th. I worry about the dealer being able to replicate the problem as it doesnt always do it. How long did it take your dealer to actually diagnose the prob?

ZOperaMan · 01-22-2012, 03:11 PM

Quote:

Originally Posted by Alchemy

I really need to get my Z looked at. I still get an occasional grind in 5th. I worry about the dealer being able to replicate the problem as it doesnt always do it. How long did it take your dealer to actually diagnose the prob?

They drove it, then called to confirm the problem the same day - brand new transmission installed three days later.

I tested the new gearbox, and the problem is now COMPLETELY gone. I can even snap from 3rd to 5th without the slightest grind. Nice service, good dealer.

--ZOM

LennyZCSD · 01-26-2013, 04:26 PM

Quote:

Originally Posted by ZOperaMan

...this after about 8600 miles.

First time I noticed the grind was after a quick 1-2 upshift, then quickly laying off the throttle, shifting rapidly into from 2nd to 5th - ggrrrinddd.

Now after reading this thread, I'm dreading. I have experimented a bit, and the grind only happens when shifting to 5th from ANY other gear quickly (up or down). Does not seem to matter how well I depress the clutch. It works fine if I wait a second or so for the gears to sync.

It also seems to lessen the chance of grinding if I slant the 4-5 upshift more diagonally "/", rather than "N"-shaped, if you know what I mean. I'm just disappointed that I have to wait longer to snap into 5th than any other gear now. Other combinations that skip, like 3-6, and 1-3 seem to work fine.

Sad to say but the 350 and the "G"s have the same issue I think I am gonna Lemon Law my 370 I am not gonna put a new tranny in every 20,000 miles. This will be my 3rd tranny since new 55,000.

Sad to say but seems the 350 and G's

Cmike2780 · 06-20-2010, 09:40 PM

I have about 11k miles on my car and this has happened 3 or 4 times and could not be repeated. I was a 100% sure I shifted correctly and thought it was just one of the many quirks of this transmission. The clutch was down all the way each time and it was just in normal highway traffic. Each time that happened, I moved the shifter into neutral, released the clutch pedal, depressed it again and it shifted into 5th without the grinding as if it never happened.

Thanks for posting this, I will monitor from now on to see if the problem gets worst.

BryanTXz · 10-03-2010, 08:11 PM

Ive got an 09 with 2600 miles on it and the 4th to 5th gear grind just started for me. It happens at slow speeds clutch fully depressed about 4-10 times before it goes away if not more its really pissing me off the car is practically brand new.

Auston · 10-03-2010, 10:24 PM

Quote:

Originally Posted by BryanTXz

Ive got an 09 with 2600 miles on it and the 4th to 5th gear grind just started for me. It happens at slow speeds clutch fully depressed about 4-10 times before it goes away if not more its really pissing me off the car is practically brand new.

I wouldn't worry, just bring it to the dealer to get the process of
replacement started

Endgame · 11-29-2010, 08:46 PM

wait, are we talking a crunching when putting the Z in gear, or transmission grinding?

Josh@STILLEN · 11-29-2010, 09:18 PM

It's as it's going into gear.. typically during more spirited driving, but as it gets worse, it will be almost impossible to get it into gear without hearing a grinding noise..

Endgame · 11-29-2010, 10:03 PM

Hmmm.. I think I need to take mine in then.....

Josh@STILLEN · 11-29-2010, 10:16 PM

Expect a bit of a challenge from the dealer.. you'll most likely need to get a tech in the car and be able to duplicate the issue before they will look to resolving it, which generally means throwing a new transmission at it.

It's pretty common now for folks to walk in saying they have seen a forum thread and this is what it is.. dealers can shy away from that. But if you're cool and get someone who cares, and show them the problem, it should be a warranty item they have no problem with. Wouldn't take them long to check things out and see how common this is.

They don't go in and fix the synchros or do anything besides just replace the transmission.

Endgame · 11-30-2010, 06:28 PM

i have an appointment on Monday!

LennyZCSD · 06-26-2011, 11:30 PM

Just had mine replaced same issue downshifting from 6th no Sycnrev on, also I coast a lot and the tech said to don't do that,, apperntly this is a different build with no synchros like the old days,, I have the extended warranty so I will still be coasting, though I will blip the throttle before I threw it into 5th,, for 45,000 they should be able to make a tranny that works in the real world,, I get 28mpg on the hywy driving like I do even got 31 in N.M. on the way to Nashville last year.. I hope it's a bit cooler in Savannah.. San Diego sure does spoil you....

wat2win · 10-04-2011, 01:10 AM

well.... im out of luck... i just moved to Korea and my 5th gear started to grind.... looks like syncromesh is not working well... if i shift a bit slower than usual, no problem, both rev matching on or off but if i kinda throw in to 5th, it grinds like split second and gone. Thats before letting off from clutch..... Dont know what to do... since there is no M/T in korea and im pretty sure warranty is not covered....

06-20-2010, 08:38 PM	#1 (permalink)
ZOperaMan Base Member Join Date: Dec 2009 Location: Houston, Texas Posts: 82 Drives: 09 TT370z Yellow 6MT Rep Power: 17	5th Gear Grind...Just Noticing ...this after about 8600 miles. First time I noticed the grind was after a quick 1-2 upshift, then quickly laying off the throttle, shifting rapidly into from 2nd to 5th - ggrrrinddd. Now after reading this thread, I'm dreading. I have experimented a bit, and the grind only happens when shifting to 5th from ANY other gear quickly (up or down). Does not seem to matter how well I depress the clutch. It works fine if I wait a second or so for the gears to sync. It also seems to lessen the chance of grinding if I slant the 4-5 upshift more diagonally "/", rather than "N"-shaped, if you know what I mean. I'm just disappointed that I have to wait longer to snap into 5th than any other gear now. Other combinations that skip, like 3-6, and 1-3 seem to work fine. Last edited by ZOperaMan; 06-20-2010 at 10:01 PM. Reason: [added detail about clutch]

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01-17-2012, 01:12 PM	#2 (permalink)
ZOperaMan Base Member Join Date: Dec 2009 Location: Houston, Texas Posts: 82 Drives: 09 TT370z Yellow 6MT Rep Power: 17	Just wanted to update here: Car now has about 33K miles, and 5th gear grind the same. Took it my dealer, who diagnosed it as synchronizers (as expected). New transmission on the way!

06-20-2010, 09:40 PM	#6 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 31	I have about 11k miles on my car and this has happened 3 or 4 times and could not be repeated. I was a 100% sure I shifted correctly and thought it was just one of the many quirks of this transmission. The clutch was down all the way each time and it was just in normal highway traffic. Each time that happened, I moved the shifter into neutral, released the clutch pedal, depressed it again and it shifted into 5th without the grinding as if it never happened. Thanks for posting this, I will monitor from now on to see if the problem gets worst.

10-03-2010, 08:11 PM	#7 (permalink)
BryanTXz Base Member Join Date: Aug 2010 Location: Bryan, Tx Posts: 6 Drives: 09 Nissan 370z PW M6 Rep Power: 16	Ive got an 09 with 2600 miles on it and the 4th to 5th gear grind just started for me. It happens at slow speeds clutch fully depressed about 4-10 times before it goes away if not more its really pissing me off the car is practically brand new.

11-29-2010, 08:46 PM	#9 (permalink)
Endgame A True Z Fanatic Join Date: Nov 2008 Location: Phoenix Posts: 1,613 Drives: Nothing Now! Rep Power: 225	wait, are we talking a crunching when putting the Z in gear, or transmission grinding?

11-29-2010, 09:18 PM	#10 (permalink)
Josh@STILLEN The370Z.com Sponsor Join Date: Dec 2008 Location: Costa Mesa, CA Posts: 1,197 Drives: 2004 G35 Coupe 6MT Rep Power: 535	It's as it's going into gear.. typically during more spirited driving, but as it gets worse, it will be almost impossible to get it into gear without hearing a grinding noise..

11-29-2010, 10:03 PM	#11 (permalink)
Endgame A True Z Fanatic Join Date: Nov 2008 Location: Phoenix Posts: 1,613 Drives: Nothing Now! Rep Power: 225	Hmmm.. I think I need to take mine in then.....

11-29-2010, 10:16 PM	#12 (permalink)
Josh@STILLEN The370Z.com Sponsor Join Date: Dec 2008 Location: Costa Mesa, CA Posts: 1,197 Drives: 2004 G35 Coupe 6MT Rep Power: 535	Expect a bit of a challenge from the dealer.. you'll most likely need to get a tech in the car and be able to duplicate the issue before they will look to resolving it, which generally means throwing a new transmission at it. It's pretty common now for folks to walk in saying they have seen a forum thread and this is what it is.. dealers can shy away from that. But if you're cool and get someone who cares, and show them the problem, it should be a warranty item they have no problem with. Wouldn't take them long to check things out and see how common this is. They don't go in and fix the synchros or do anything besides just replace the transmission.

11-30-2010, 06:28 PM	#13 (permalink)
Endgame A True Z Fanatic Join Date: Nov 2008 Location: Phoenix Posts: 1,613 Drives: Nothing Now! Rep Power: 225	i have an appointment on Monday!

06-26-2011, 11:30 PM	#14 (permalink)
LennyZCSD Base Member Join Date: Jan 2010 Location: San Diego Posts: 114 Drives: 10 370zST 6spd white Rep Power: 17	Just had mine replaced same issue downshifting from 6th no Sycnrev on, also I coast a lot and the tech said to don't do that,, apperntly this is a different build with no synchros like the old days,, I have the extended warranty so I will still be coasting, though I will blip the throttle before I threw it into 5th,, for 45,000 they should be able to make a tranny that works in the real world,, I get 28mpg on the hywy driving like I do even got 31 in N.M. on the way to Nashville last year.. I hope it's a bit cooler in Savannah.. San Diego sure does spoil you....

10-04-2011, 01:10 AM	#15 (permalink)
wat2win Base Member Join Date: Jan 2011 Location: Seoul, Korea Posts: 132 Drives: 40th Z Rep Power: 16	well.... im out of luck... i just moved to Korea and my 5th gear started to grind.... looks like syncromesh is not working well... if i shift a bit slower than usual, no problem, both rev matching on or off but if i kinda throw in to 5th, it grinds like split second and gone. Thats before letting off from clutch..... Dont know what to do... since there is no M/T in korea and im pretty sure warranty is not covered....