5th gear synchro harshness? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Subie · 01-07-2013, 12:27 AM

Is anyone else experiencing resistance from the 5th gear synchro, mainly when downshifting from 6th to 5th? I don't encounter any resistance downshifting to other gears, but 5th gear is a pain every time.

Le86 · 01-07-2013, 12:33 AM

This happened to be the other day when I was getting on the freeway. Shifting from 4th to 5th, it didn't seem to go into gear all the way and grinded. Or maybe it was my fault since I was exhausted from work. Either way, I'm at ~3500 and plan on changing the gear oil soon.

tech4pdx · 01-07-2013, 12:37 AM

I have the same behavior. As long as it engages without too much "grittiness" you should be ok. I almost never do the 6-5 downshift, so no biggie. I think the lack of triple cones on the higher gears carries some logic. When I take my time and try to do a good rev match, it feels better.

tech4pdx · 01-07-2013, 12:43 AM

I would guess that 5 and 6 are single cone.

Subie · 01-07-2013, 12:43 AM

Quote:

Originally Posted by tech4pdx

I have the same behavior. As long as it engages without too much "grittiness" you should be ok. I almost never do the 6-5 downshift, so no biggie. I think the lack of triple cones on the higher gears carries some logic. When I take my time and try to do a good rev match, it feels better.

My thoughts exactly (emphasis mine). I'm wondering if it would be better to downshift into 4th instead for synchro longevity since it comparatively engages with ease. I may change the transmission fluid soon to see if it changes the behavior at all.

tech4pdx · 01-07-2013, 12:47 AM

I changed my fluid to Redline and it made no difference. Every manual transmission I have ever driven in the last 12 years (including the infamous T56) has "issues". Drive that shit hard and don't sweat it too much. I might try Pentosin just for giggles.

Bonburner · 01-09-2013, 04:37 AM

5th to 6th has been struggled a lot for me for whatever reason.
I'm around 6700 miles and been meaning to change out the trans fluids, its been getting .. grittier as the miles tack on

whtchocla7e · 01-09-2013, 09:10 AM

Drive it normally within limits and enjoy yourself. If it breaks from normal use then that's what the warranty is for.

gmookher · 01-09-2013, 10:26 AM

I'm the pentosin guy, never any harshness any gear

Sigh-on-Rice · 01-09-2013, 01:27 PM

If it's triple cone vs single cone, then wouldn't the 4th have the same issue as 5th and 6th?
Mine shifts smoothly to any gear.

tech4pdx · 01-09-2013, 05:11 PM

I am not 100% sure but I'm speculating that 4th is double cone. We know that these Aisin transmissions are stubborn when cold and we also know that out of the factory, some may be "out of spec". I have 2000 miles on mine and 4-5 upshift / 6-5 downshift are gritty. It doesn't inspire confidence. I'm rev matching but it doesn't feel right. I am definitely going to try the pentosin.

tech4pdx · 01-09-2013, 05:23 PM

Quote:

Originally Posted by gmookher

I'm the pentosin guy, never any harshness any gear

Right on.. Thanks for testing.

Gords_zenith · 01-09-2013, 05:54 PM

I noticed going from 5th to forth is a PITA, although it's probably cuz I keep hitting the gates when downshifting, thinking its like my Ranger haha still not used to actually sliding it down over than down, vs an almost diagonal movement with the truck(virtually no gates).....

OrbitalEllipses · 01-09-2013, 06:35 PM

I find 5-6 to be much worse than 4-5.

01-07-2013, 12:27 AM	#1
Subie Señor Member Join Date: Apr 2012 Drives: 2013 SSM DZE BRZ Location: SC Posts: 947 Thanks: 728 Thanked 405 Times in 196 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	5th gear synchro harshness? Is anyone else experiencing resistance from the 5th gear synchro, mainly when downshifting from 6th to 5th? I don't encounter any resistance downshifting to other gears, but 5th gear is a pain every time.

01-07-2013, 12:33 AM	#2
Le86 Senior Member Join Date: Sep 2012 Drives: Asphalt FR-S Location: PNW Posts: 144 Thanks: 11 Thanked 19 Times in 13 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	This happened to be the other day when I was getting on the freeway. Shifting from 4th to 5th, it didn't seem to go into gear all the way and grinded. Or maybe it was my fault since I was exhausted from work. Either way, I'm at ~3500 and plan on changing the gear oil soon. __________________ 10/01/2012 FR-S down for P0019 code. Received vehicle back from dealership with a new ECU 10/30/2012

01-09-2013, 09:10 AM	#8
whtchocla7e Senior Member Join Date: May 2012 Drives: 2013 FR-S Hot Lava Location: CT Posts: 424 Thanks: 30 Thanked 222 Times in 81 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Drive it normally within limits and enjoy yourself. If it breaks from normal use then that's what the warranty is for. __________________ Live to drive another day

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
2nd gear synchro FIX- MT owners read this thread	gmookher	Mechanical Maintenance (Oil, Fluids, Break-In, Servicing)	477	01-06-2019 07:22 AM
No more 1st gear thump or 2nd gear notchiness	kc4mne	Scion FR-S / Toyota 86 GT86 General Forum	28	09-06-2012 09:39 PM
Base FR-S Radio bluetooth synchro issueS!	Duff_man	Electronics \| Audio \| NAV \| Infotainment	3	08-05-2012 05:36 AM
Reverse gear on the first and second gear side	randytindoggy	Scion FR-S / Toyota 86 GT86 General Forum	50	01-29-2012 02:21 PM
Will FT-86 have Synchro Rev Match?	Dark	Scion FR-S / Toyota 86 GT86 General Forum	56	05-27-2010 12:05 PM

01-07-2013, 12:37 AM	#3
tech4pdx Make love Join Date: Nov 2012 Drives: H8R.. Not really Location: Edge of the Milky Way Posts: 780 Thanks: 524 Thanked 214 Times in 143 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	I have the same behavior. As long as it engages without too much "grittiness" you should be ok. I almost never do the 6-5 downshift, so no biggie. I think the lack of triple cones on the higher gears carries some logic. When I take my time and try to do a good rev match, it feels better.

01-07-2013, 12:43 AM	#4
tech4pdx Make love Join Date: Nov 2012 Drives: H8R.. Not really Location: Edge of the Milky Way Posts: 780 Thanks: 524 Thanked 214 Times in 143 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	I would guess that 5 and 6 are single cone.

01-07-2013, 12:47 AM	#6
tech4pdx Make love Join Date: Nov 2012 Drives: H8R.. Not really Location: Edge of the Milky Way Posts: 780 Thanks: 524 Thanked 214 Times in 143 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	I changed my fluid to Redline and it made no difference. Every manual transmission I have ever driven in the last 12 years (including the infamous T56) has "issues". Drive that shit hard and don't sweat it too much. I might try Pentosin just for giggles.

01-09-2013, 10:26 AM	#9
gmookher Banned Join Date: Aug 2012 Drives: VortechSC,BorlaEL,Perrin,GCRace Location: HighHeatHighAltitudeAZ,USA Posts: 2,254 Thanks: 458 Thanked 669 Times in 394 Posts Mentioned: 9 Post(s) Tagged: 2 Thread(s)	I'm the pentosin guy, never any harshness any gear

01-09-2013, 05:11 PM	#11
tech4pdx Make love Join Date: Nov 2012 Drives: H8R.. Not really Location: Edge of the Milky Way Posts: 780 Thanks: 524 Thanked 214 Times in 143 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	I am not 100% sure but I'm speculating that 4th is double cone. We know that these Aisin transmissions are stubborn when cold and we also know that out of the factory, some may be "out of spec". I have 2000 miles on mine and 4-5 upshift / 6-5 downshift are gritty. It doesn't inspire confidence. I'm rev matching but it doesn't feel right. I am definitely going to try the pentosin.

01-09-2013, 05:54 PM	#13
Gords_zenith Senior Member Join Date: Nov 2012 Drives: WRB BRZ Sport Tech Location: Durham, Canada Posts: 354 Thanks: 178 Thanked 110 Times in 64 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I noticed going from 5th to forth is a PITA, although it's probably cuz I keep hitting the gates when downshifting, thinking its like my Ranger haha still not used to actually sliding it down over than down, vs an almost diagonal movement with the truck(virtually no gates).....

01-09-2013, 06:35 PM	#14
OrbitalEllipses Banned Join Date: Jan 2012 Drives: Attitude Location: MD Posts: 10,046 Thanks: 884 Thanked 4,890 Times in 2,903 Posts Mentioned: 123 Post(s) Tagged: 4 Thread(s)	I find 5-6 to be much worse than 4-5.

User Name		Remember Me?
Password