grinding 4th on down shift any suggestions?

subysti5486 · 05-22-2008, 04:51 PM

hello STi experts! i have a minor problem, when going through the gears 1-6 i have no problem(or grinding) shifting, but when i down shift from 5th or 6th into 4th gear it grinds but still slips into 4th gear; any idea why it would be doing this? if im in 6th gear and i depress the clutch put it in 3rd(still holding the clutch) and then put into 4th gear it does not grind, but from 5th or 6th into 4th it grinds.

ATTI2D · 05-22-2008, 04:55 PM

Prolly a syncro. If your under 60k its coverd by warranty.

subysti5486 · 05-22-2008, 05:01 PM

well i thought about the synchro but i have absolutely no problem up shifting into 4th its only when i down shift into 4th you think its still the synchro?

KiTsuNe · 05-22-2008, 06:42 PM

if it starts getting worse and worse its the syncro, i had mine go out at 36000 and replaced all my syncros with carbon plated ones since my 04 didnt have them. While i was at it i got hardened JDM gears and billet shifter forks

xSTIx · 05-23-2008, 03:52 AM

Quote:

Originally Posted by KiTsuNe

if it starts getting worse and worse its the syncro, i had mine go out at 36000 and replaced all my syncros with carbon plated ones since my 04 didnt have them. While i was at it i got hardened JDM gears and billet shifter forks

Can you PM me a link to where you bought those syncros?

thunderbird · 05-23-2008, 05:42 AM

Quote:

Originally Posted by xSTIx

Can you PM me a link to where you bought those syncros?

ditto please. I'm way past 60k and the synchros are not doing their job any longer in 4th and 5th.

subysti5486 · 05-23-2008, 06:33 AM

how much did it cost to get them replaced? i have 22,XXX miles you think its covered under warranty?

KiTsuNe · 05-23-2008, 09:25 AM

I had alot of transmission work done so i'm not really sure if its covered under warranty. I basicly i have an 06 JDM tranny now.

z1auto sells the complete set

Z-1 Performance Automotive Services Inc. - STi JDM Upgrade Kit 6 Speed

BillFromTR · 05-23-2008, 09:49 AM

I had the same problem. Switched to Motul gear oil and it went away...

forget your syncros, unless your under warranty thats some serious cash.
Downshift into 4th....Grind???

KiTsuNe · 05-23-2008, 10:50 AM

I heard Motul "revitalizes" the syncros. If it still occurs after tryinng the Motul i suggest replacing the syncros. Mine got to the point where i can slip it into fourth but the second i apply any throttle it would fly out and grind, after if i just let out the clutch fourth wouldnt even stay in.

ATTI2D · 05-23-2008, 12:55 PM

Replace your syncros under warranty and give Subaru the motul to put in.

Crozetian · 05-24-2008, 08:21 PM

Quote:

Originally Posted by subysti5486

i have a minor problem, when going through the gears 1-6 i have no problem(or grinding) shifting, but when i down shift from 5th or 6th into 4th gear it grinds but still slips into 4th gear; any idea why it would be doing this?

As I've posted here, I have exactly the opposite problem on a new 08 STI: when I upshift from 3rd the 4th, and only then, I have a very occasional grind ("very occasional" = once every several days, where a typical day might be around 75 miles or so, many on back roads).

My dealer replaced the gear oil with the Subaru Extra-S, and that seemed to help -- some. Before that change I was getting the grind a couple of times a day; now, about 1000 miles later, I'm getting it only every couple of days.

I understand that its probably a synchro problem if it gets worse, but what if it doesn't get worse? Should I try the magic Motul? Also, the problem is that Subaru is not going to replace the synchro, or even tear down the transmission to look, in less they can experience the problem for themselves, but this will be hard given the infrequency of the problem. Not sure what, if anything, to do....

sticop · 05-25-2008, 06:25 AM

Quote:

Originally Posted by KiTsuNe

I had alot of transmission work done so i'm not really sure if its covered under warranty. I basicly i have an 06 JDM tranny now.

z1auto sells the complete set

Z-1 Performance Automotive Services Inc. - STi JDM Upgrade Kit 6 Speed

so does that kit just come with parts for 5th and 6th? and is sounds like the highspeed kit comes with 2nd-6th?

none of that helps my 1st gear syncro problem

05-22-2008, 04:51 PM	#1
subysti5486 Junior STI Driver Car: wrb 05 sti Fav Mod: my future DOM III+ METH Location: tulsa, ok Posts: 137 Join Date: Nov 2007 Trader Rating: (0)	grinding 4th on down shift any suggestions? hello STi experts! i have a minor problem, when going through the gears 1-6 i have no problem(or grinding) shifting, but when i down shift from 5th or 6th into 4th gear it grinds but still slips into 4th gear; any idea why it would be doing this? if im in 6th gear and i depress the clutch put it in 3rd(still holding the clutch) and then put into 4th gear it does not grind, but from 5th or 6th into 4th it grinds. This ad is not endorsed by this member. Please register or login to hide this ad.

05-22-2008, 04:55 PM	#2
ATTI2D Senior STI Driver Car: JBP 04 STi Fav Mod: 17x9" on 245's ;) Location: Easton PA Posts: 343 Join Date: Feb 2007 Trader Rating: (1)	Re: grinding 4th on down shift any suggestions? Prolly a syncro. If your under 60k its coverd by warranty.

05-22-2008, 05:01 PM	#3
subysti5486 Junior STI Driver Car: wrb 05 sti Fav Mod: my future DOM III+ METH Location: tulsa, ok Posts: 137 Join Date: Nov 2007 Trader Rating: (0)	Re: grinding 4th on down shift any suggestions? well i thought about the synchro but i have absolutely no problem up shifting into 4th its only when i down shift into 4th you think its still the synchro?

05-22-2008, 06:42 PM	#4
KiTsuNe Spec C Club Car: The Vroom-mobile Fav Mod: JDM Gears Location: San Jose, California Posts: 2,334 Join Date: Jun 2005 Trader Rating: (1)	Re: grinding 4th on down shift any suggestions? if it starts getting worse and worse its the syncro, i had mine go out at 36000 and replaced all my syncros with carbon plated ones since my 04 didnt have them. While i was at it i got hardened JDM gears and billet shifter forks

05-23-2008, 06:33 AM	#7
subysti5486 Junior STI Driver Car: wrb 05 sti Fav Mod: my future DOM III+ METH Location: tulsa, ok Posts: 137 Join Date: Nov 2007 Trader Rating: (0)	Re: grinding 4th on down shift any suggestions? how much did it cost to get them replaced? i have 22,XXX miles you think its covered under warranty?

05-23-2008, 09:25 AM	#8
KiTsuNe Spec C Club Car: The Vroom-mobile Fav Mod: JDM Gears Location: San Jose, California Posts: 2,334 Join Date: Jun 2005 Trader Rating: (1)	Re: grinding 4th on down shift any suggestions? I had alot of transmission work done so i'm not really sure if its covered under warranty. I basicly i have an 06 JDM tranny now. z1auto sells the complete set Z-1 Performance Automotive Services Inc. - STi JDM Upgrade Kit 6 Speed

05-23-2008, 09:49 AM	#9
BillFromTR Spec C Club Car: Wingless '05 Fav Mod: BOV and MBC Location: Armpit of America Posts: 2,232 Join Date: Mar 2005 Trader Rating: (4)	Re: grinding 4th on down shift any suggestions? I had the same problem. Switched to Motul gear oil and it went away... forget your syncros, unless your under warranty thats some serious cash. Downshift into 4th....Grind???

05-23-2008, 10:50 AM	#10
KiTsuNe Spec C Club Car: The Vroom-mobile Fav Mod: JDM Gears Location: San Jose, California Posts: 2,334 Join Date: Jun 2005 Trader Rating: (1)	Re: grinding 4th on down shift any suggestions? I heard Motul "revitalizes" the syncros. If it still occurs after tryinng the Motul i suggest replacing the syncros. Mine got to the point where i can slip it into fourth but the second i apply any throttle it would fly out and grind, after if i just let out the clutch fourth wouldnt even stay in.

05-23-2008, 12:55 PM	#11
ATTI2D Senior STI Driver Car: JBP 04 STi Fav Mod: 17x9" on 245's ;) Location: Easton PA Posts: 343 Join Date: Feb 2007 Trader Rating: (1)	Re: grinding 4th on down shift any suggestions? Replace your syncros under warranty and give Subaru the motul to put in.