6th to 5th downshift grind

osbornsm · 09-04-2013, 04:08 PM

Hello all,

I have recently noticed that "occasionally" when shifting from 6th to 5th gear, i get a nice little crunch sound.

Not a gears mashing noise, but just a LOT more feedback than i "should" be feeling.
- Happens warm or cold
- Happens witih SRM on or off

I did a search and found a sh*t ton of transmission issues posted on here.

This is sort of here to track MY transmission warranty issues...

...here we go!!

jlo370z · 09-04-2013, 04:10 PM

mine does it too, I havent figured out if its just me shifting faster then the car is keeping up ( i leave rev match on) or if maybe im not engaging the clutch all the way.

it only happens when driving really slow in 6th

might add that this only happens when car is not up to temp yet

kenchan · 09-04-2013, 04:21 PM

i think clutch-in completely and slower into 5th should fix it.

only time i grinded a gear was while the car was brand new, less than 200miles and i was shifting into 4th from 3rd and GRIND! that was the only time. no issues with grinding up or downshifts.

i remember reading a post early on back in 2009 where a member had 5th gear grind. he got a new syncro and fixed the problem.

osbornsm · 09-04-2013, 04:23 PM

Quote:

Originally Posted by jlo370z

mine does it too, I havent figured out if its just me shifting faster then the car is keeping up ( i leave rev match on) or if maybe im not engaging the clutch all the way.

I HAVE tested this and found that the clutch was TO THE FLOOR when i get the grind. Nissan needs to have the car overnight to diagnose the issue... umm, this is the only car i have damnit.

I shall be in touch with further results !

jlo370z · 09-04-2013, 05:21 PM

Quote:

Originally Posted by osbornsm

this is the only car i have damnit.

this no good, buy winter beater

Rusty · 09-04-2013, 10:41 PM

Mine does this too. Only on a quick downshift into 5th. If I take it easy. No problem.

martin82 · 09-05-2013, 02:01 AM

That's how my csc failure started the. Downshift to 3rd grinding and up shifts

Mt Tam I am · 09-05-2013, 10:31 AM

Yikes. I have never had this happen and my CSC is still OK.......... I see my future ahead.

b15 · 09-05-2013, 01:10 PM

Mine does this too when cold. Seems to happen on just about every MT Z.

If I shift slow from 6 to 5, no grind. But if I go fast, it grinds. It's intermittent and only until the trans fully warms up. Mine hasn't gotten worse, but I've read that others have and Nissan swapped out the trans.

Rusty · 09-05-2013, 07:33 PM

Quote:

Originally Posted by b15

Mine does this too when cold. Seems to happen on just about every MT Z.

If I shift slow from 6 to 5, no grind. But if I go fast, it grinds. It's intermittent and only until the trans fully warms up. Mine hasn't gotten worse, but I've read that others have and Nissan swapped out the trans.

It doesn't matter on mine. Hot or cold. And it hasn't gotten any worse.

P's_Z · 12-07-2017, 08:19 PM

Bumping this thread as i am starting to have this issue myself, except downshifting to 4th, 3rd or just going into neutral from 3rd. Clutch is completely engaged and i still get the grind. I did transf fluid swap about 15k miles ago with redline and hadnt had issues until today. Does anyone know if replacing trans fluid gets rid of this? Ive read that some people had synchros gone bad and others had transmissions replaced

RumbleFish · 12-08-2017, 12:51 PM

Quote:

Originally Posted by P's_Z

Bumping this thread as i am starting to have this issue myself, except downshifting to 4th, 3rd or just going into neutral from 3rd. Clutch is completely engaged and i still get the grind. I did transf fluid swap about 15k miles ago with redline and hadnt had issues until today. Does anyone know if replacing trans fluid gets rid of this? Ive read that some people had synchros gone bad and others had transmissions replaced

When this happened to me, it was the 4th & 5th gear syncrho. Luckily, I was still under warranty so, they installed a brand new trans. Good luck.

P's_Z · 12-08-2017, 02:15 PM

Quote:

Originally Posted by RumbleFish

When this happened to me, it was the 4th & 5th gear syncrho. Luckily, I was still under warranty so, they installed a brand new trans. Good luck.

Oh wow

I have extended warranty but not looking forward to the downtime if in fact its the synchros

RumbleFish · 12-08-2017, 07:01 PM

Quote:

Originally Posted by P's_Z

Oh wow

I have extended warranty but not looking forward to the downtime if in fact its the synchros

Yeah, bad synchros is a known issue. Your extended warranty is about to save you $4k+

Have them order the trans and bring it in when it arrives.
I had mine back in a couple days.

PharmDZ · 12-08-2017, 09:14 PM

5th was crap for me - started off a slight grind if I didn't go in careful, became a nasty grind if I wasn't careful, and slight grind with all shifts. Around 100k miles I ended up getting a good deal on a new trans and swapped it out. These days I don't skip gears, and I'm super easy on my trans other than the track. Trying to make this one last. Haha

09-04-2013, 04:08 PM	#1 (permalink)
osbornsm A True Z Fanatic Join Date: Jun 2011 Location: WHAT Posts: 2,551 Drives: 2018 Camaro SS 1LE Rep Power: 424	6th to 5th downshift grind Hello all, I have recently noticed that "occasionally" when shifting from 6th to 5th gear, i get a nice little crunch sound. Not a gears mashing noise, but just a LOT more feedback than i "should" be feeling. - Happens warm or cold - Happens witih SRM on or off I did a search and found a sht ton of transmission issues posted on here. This is sort of here to track MY transmission warranty issues... ...here we go!! __________________ 2018 Camaro SS 1LE* (455hp) - 2011 Nissan 370z (333hp) - 2004 VW R32 (240hp) - 2000 Civic Si (160hp)

09-04-2013, 04:10 PM	#2 (permalink)
jlo370z Im a Fireball Join Date: Apr 2012 Location: Ill in noise Posts: 3,370 Drives: 11 370z Red 6spd Rep Power: 43427	mine does it too, I havent figured out if its just me shifting faster then the car is keeping up ( i leave rev match on) or if maybe im not engaging the clutch all the way. it only happens when driving really slow in 6th might add that this only happens when car is not up to temp yet __________________ ❝The Jlo370Z Build❞ 523HP \| 455 ftb tq \| 11.5 PSI \| 93 Octane *2017 Porsche 991.2 C4!l*

09-04-2013, 10:41 PM	#6 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,435 Drives: 2011 Nismo GM 6M Rep Power: 2684438	Mine does this too. Only on a quick downshift into 5th. If I take it easy. No problem. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

09-05-2013, 10:31 AM	#8 (permalink)
Mt Tam I am A True Z Fanatic Join Date: Jun 2010 Location: California Posts: 10,709 Drives: 370Z T/S/N 6MT & XKE Rep Power: 3844	Yikes. I have never had this happen and my CSC is still OK.......... I see my future ahead. __________________ "Does the carpet match the drapes? NO!!! I don't date bald women." Nissan Motorsports 34R Oil Cooler. Stillen CBE. Hotchkis Sport Sway Bars. KW Variant 3 Coilover System. Stillen Gen3 CAI. Michelin Pilot Super Sport. Stillen Brake Ducts. Carbotech™ XP10/XP8 Pads. Z1 Front Rotors. Z1 Stainless Brake Lines. Two degrees of camber

12-07-2017, 08:19 PM	#11 (permalink)
P's_Z A True Z Fanatic Join Date: Apr 2013 Location: PR Posts: 1,530 Drives: Zeta Rep Power: 470	Bumping this thread as i am starting to have this issue myself, except downshifting to 4th, 3rd or just going into neutral from 3rd. Clutch is completely engaged and i still get the grind. I did transf fluid swap about 15k miles ago with redline and hadnt had issues until today. Does anyone know if replacing trans fluid gets rid of this? Ive read that some people had synchros gone bad and others had transmissions replaced __________________ Zeta

09-04-2013, 04:21 PM	#3 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	i think clutch-in completely and slower into 5th should fix it. only time i grinded a gear was while the car was brand new, less than 200miles and i was shifting into 4th from 3rd and GRIND! that was the only time. no issues with grinding up or downshifts. i remember reading a post early on back in 2009 where a member had 5th gear grind. he got a new syncro and fixed the problem.

09-05-2013, 02:01 AM	#7 (permalink)
martin82 A True Z Fanatic Join Date: Nov 2011 Location: los angeles Posts: 2,636 Drives: 12 Nissan 370Z MB M6 Rep Power: 20	That's how my csc failure started the. Downshift to 3rd grinding and up shifts

09-05-2013, 01:10 PM	#9 (permalink)
b15 A True Z Fanatic Join Date: Feb 2010 Location: Chicago Posts: 3,229 Drives: 4drz Rep Power: 36572	Mine does this too when cold. Seems to happen on just about every MT Z. If I shift slow from 6 to 5, no grind. But if I go fast, it grinds. It's intermittent and only until the trans fully warms up. Mine hasn't gotten worse, but I've read that others have and Nissan swapped out the trans.

12-08-2017, 09:14 PM	#15 (permalink)
PharmDZ Track Member Join Date: Jul 2012 Location: New Jersey Posts: 997 Drives: 11 Nissan 370Z BS M6 Rep Power: 14	5th was crap for me - started off a slight grind if I didn't go in careful, became a nasty grind if I wasn't careful, and slight grind with all shifts. Around 100k miles I ended up getting a good deal on a new trans and swapped it out. These days I don't skip gears, and I'm super easy on my trans other than the track. Trying to make this one last. Haha P's_Z likes this.

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