3rd-4th gear grind...but only near redline - Page 4 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

shiro · 08-13-2014, 10:29 AM

I do agree with what Dipstik-sportech said. I've had this issue when shifting from 3rd-4th when my car was stock. With my turbo setup I have the issue between 2nd-3rd, 3rd-4th, & 4th-5th at a high RPM. I don't believe it is clutch related or shifter related (have a Kartboy Shifter). I believe it has to do with the amount of torque at the high RPM and the syncros. Possibly too much inertia for the syncros when applying the next gear. After all it is a new design with a triple cone syncro application.

Now the wait begins until the transmission gives out lol... oh well, the cost of performance, right? Or just bad (and new) design...

Churnobyl · 08-18-2014, 07:09 PM

Just started having this issue within the last week. 6400 miles on the OD . 14 BRZ.

I get in 2-4 on shifts over 5500 and 34 just a little higher. Crunch is the best way to describe it. Street driving its fine. but if you get on it and shift, its noticeable and replicate-able.

I'm clearly not a shifter TSB candidate. So we wills see what the dealer has to say.

twag4 · 08-18-2014, 10:59 PM

Redline mt90 trans oil, 75w90 fixed my third to fourth little scratchy shift. It is GL4 only, no GL5. Toyota pickup guys rave about it fixing manual transmission woes. It worked for me. It was better immediately, but I drove a 200 mile journey in one day about a week after changing it- and it is perfect now. Absolutely perfect shifts up and down (tear of joy streaming down cheek)

calmtigers · 08-19-2014, 03:16 AM

Mine was checked and found to have the issue everyone please get it done under warranty while you can

Edit: my issue was a 3-4 crunch when in the high RPM

fanaticalz · 08-21-2014, 08:06 PM

ugh, i have this problem. shifting above 7k rpm from 3rd to 4th, there's a crunch, and it happens almost every time. if i left the revs drop a little before i shift, it's fine. i guess i'll take it to the dealer.

questions for you guys who had the tranny replaced, how long did it sit at the dealer for?

misooscar · 08-23-2014, 05:19 AM

I've noticed the 3rd 4th gear grind is not apparent with the Vortech kit

Edit:

It came back at my 1st track day...I guess I wasn't driving as hard on the street with the Vortech...

Sent from my SM-N900T using Tapatalk

rs999 · 09-19-2014, 11:54 PM

I did a track day today and the 3-4 crunch is definitely related to high RPMs. I'd get it up shifting from 3-4 when powering out of turns.

mtsui · 09-20-2014, 03:28 AM

mine grind when 3 going to 4 at high rpm, I tried 2 of my friends frs and their tranny didn't grind at all!

xyborg · 09-23-2014, 04:53 PM

Has anyone noticed this in the higher gears? I don't have any problems 1-4 but if i shift into 5th at high rpm I'll get a crunch.

number1Tango · 09-23-2014, 06:12 PM

Quote:

Originally Posted by xyborg

Has anyone noticed this in the higher gears? I don't have any problems 1-4 but if i shift into 5th at high rpm I'll get a crunch.

if I redline it in 4th and shift aggressive to 5th I get the grind occasionally, but it's not EVERY time or it will be difficult to shift it into 5th

xyborg · 09-23-2014, 08:04 PM

Quote:

Originally Posted by number1Tango

if I redline it in 4th and shift aggressive to 5th I get the grind occasionally, but it's not EVERY time or it will be difficult to shift it into 5th

It happens to me almost a every time I shift into 5th at a high rpm, it could even be in a highway merging situation where 2-3 will be aggressive to get up to speed and once at traffic speed throwing it into 5th before the rpms drop it'll crunch.

AceHeader-MT · 09-24-2014, 01:46 AM

I had the same problems on the track, but I changed the solid engine mount and no more grinding again.

calmtigers · 09-25-2014, 05:36 AM

Go to the dealer, in the recalls thread there is lots of documentation of others having similar issue. I did dealer swapped the tranny new one is butter

Albaro08 · 05-12-2015, 04:16 PM

Quote:

Originally Posted by twag4

Redline mt90 trans oil, 75w90 fixed my third to fourth little scratchy shift. It is GL4 only, no GL5. Toyota pickup guys rave about it fixing manual transmission woes. It worked for me. It was better immediately, but I drove a 200 mile journey in one day about a week after changing it- and it is perfect now. Absolutely perfect shifts up and down (tear of joy streaming down cheek)

Is it still good with redline my grinding started after the change never had it before that in any gear so you can be right

08-19-2014, 03:16 AM	#46
calmtigers Senior Member Join Date: Oct 2013 Drives: 2014 Whiteout TRD FR-S 6MT Location: Fresno / DTLA Posts: 928 Thanks: 628 Thanked 376 Times in 214 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	3rd-4th gear grind...but only near redline Mine was checked and found to have the issue everyone please get it done under warranty while you can Edit: my issue was a 3-4 crunch when in the high RPM __________________ "I love dinosaurs so much that I’ve based my life on burning as much black melted dinosaur flesh as I can on a daily basis...even the screaming sound of prehistoric reptilians being burnt through any of the classic Japanese four cylinders gives me great joy."

08-21-2014, 08:06 PM	#47
fanaticalz Senior Member Join Date: Dec 2013 Drives: WRB BRZ Location: Monroe, WA Posts: 204 Thanks: 18 Thanked 52 Times in 36 Posts Mentioned: 4 Post(s) Tagged: 1 Thread(s)	ugh, i have this problem. shifting above 7k rpm from 3rd to 4th, there's a crunch, and it happens almost every time. if i left the revs drop a little before i shift, it's fine. i guess i'll take it to the dealer. questions for you guys who had the tranny replaced, how long did it sit at the dealer for? __________________ Revved Magazine Feature

08-23-2014, 05:19 AM	#48
misooscar Senior Member Join Date: Apr 2014 Drives: Posts: 224 Thanks: 182 Thanked 40 Times in 35 Posts Mentioned: 3 Post(s) Tagged: 1 Thread(s)	I've noticed the 3rd 4th gear grind is not apparent with the Vortech kit Edit: It came back at my 1st track day...I guess I wasn't driving as hard on the street with the Vortech... Sent from my SM-N900T using Tapatalk Last edited by misooscar; 10-20-2014 at 11:28 PM.

09-19-2014, 11:54 PM	#49
rs999 Senior Member Join Date: Jan 2014 Drives: VW MK6 GTI \| 13 Mustang GT Location: Pungo Posts: 212 Thanks: 223 Thanked 64 Times in 42 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I did a track day today and the 3-4 crunch is definitely related to high RPMs. I'd get it up shifting from 3-4 when powering out of turns. __________________ SOLD FR-S Build \| MK6 GTI Build \| I might be getting another FR-S

09-25-2014, 05:36 AM	#55
calmtigers Senior Member Join Date: Oct 2013 Drives: 2014 Whiteout TRD FR-S 6MT Location: Fresno / DTLA Posts: 928 Thanks: 628 Thanked 376 Times in 214 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Go to the dealer, in the recalls thread there is lots of documentation of others having similar issue. I did dealer swapped the tranny new one is butter __________________ "I love dinosaurs so much that I’ve based my life on burning as much black melted dinosaur flesh as I can on a daily basis...even the screaming sound of prehistoric reptilians being burnt through any of the classic Japanese four cylinders gives me great joy."

08-18-2014, 10:59 PM	#45
twag4 Senior Member Join Date: Sep 2013 Drives: frs Location: The depths Posts: 749 Thanks: 355 Thanked 427 Times in 241 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	Redline mt90 trans oil, 75w90 fixed my third to fourth little scratchy shift. It is GL4 only, no GL5. Toyota pickup guys rave about it fixing manual transmission woes. It worked for me. It was better immediately, but I drove a 200 mile journey in one day about a week after changing it- and it is perfect now. Absolutely perfect shifts up and down (tear of joy streaming down cheek)

09-20-2014, 03:28 AM	#50
mtsui Senior Member Join Date: Feb 2013 Drives: 135i Location: walnut Posts: 304 Thanks: 22 Thanked 30 Times in 26 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	mine grind when 3 going to 4 at high rpm, I tried 2 of my friends frs and their tranny didn't grind at all!

09-23-2014, 04:53 PM	#51
xyborg Member Join Date: Sep 2014 Drives: 14' firestorm Location: Wilmington NC Posts: 13 Thanks: 0 Thanked 2 Times in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Has anyone noticed this in the higher gears? I don't have any problems 1-4 but if i shift into 5th at high rpm I'll get a crunch.

09-24-2014, 01:46 AM	#54
AceHeader-MT Senior Member Join Date: Oct 2013 Drives: 2012 FR-S Location: Taiwan Taichung Posts: 225 Thanks: 359 Thanked 695 Times in 159 Posts Mentioned: 19 Post(s) Tagged: 0 Thread(s)	I had the same problems on the track, but I changed the solid engine mount and no more grinding again.

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