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12-08-2006, 02:16 AM
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#1 | | 12 Second Club
Join Date: Aug 2005 Location: Pasadena, CA
Posts: 1,961
|  Please dont tell me I need a new Synchro!
Lately I am experiencing a problem.
I grind gears when I upshift from 2 - 3. However, It only grinds when I am WOT at above 5500 RPM/6000 RPM or so ( basically High RPM/racing shifts). It wont grind at 4000 or normal driving 1200 RPM - 2500 RPM, Just when I am fully accelerating and shifting when Im close to redline..
I am pretty sure my 3rd gear syncro is bad. But here is where its weird and Im unsure about if its the synchro.
when I downshift on the freeway to pass a car it also grinds, when I go into 3. But it grinds when I go from 6th or 5th into 3. not so much as from 4th. and it only grinds when I do a fast downshift if I wait a second or two it wont grind.
So what is up with this?
The T-56 has almost 84000 miles on it and is the stock T-56 the car came with ( as far as I know) Also this started happening after my Aluminum flywheel was installed. I dont mean right after I installed it, it started this. But didnt do this when my steel flywheel was on. It didnt grind up until a 1000+ miles were put on the new clutch, flywheel.
I dont know if the flywheel has anything to do with it.
But any ideas as to why its doing this?
__________________
2002 pewter M6 Z28, 402..
493RWHP/468RWTQ
((best 1/8 = 7.86 @ 89.25mph on slicks 3.73s (w bolt-on LS1-old engine))) | 
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12-08-2006, 09:49 AM
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#2 | | TECH Junkie
Join Date: Nov 2001 Location: Houston,Tx
Posts: 3,534
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Definantly a blocker ring but probably a slider as well. When the teeth on the slider round off it causes grinding issues as well. Time for a rebuild.
Amber
T56Rebuilds.com
__________________
02 SOM Z28 M6
8.69@156MPH Worlds Quickest and fastest N/A LS1 M6 T56 | |
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12-08-2006, 12:46 PM
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#3 | | 12 Second Club
Join Date: Aug 2005 Location: Pasadena, CA
Posts: 1,961
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Damn, I dont have the money for a rebuild yet. I was planning everything. Ford 9" by April, then engine work by summer, then Trans... Oh well.
__________________
2002 pewter M6 Z28, 402..
493RWHP/468RWTQ
((best 1/8 = 7.86 @ 89.25mph on slicks 3.73s (w bolt-on LS1-old engine))) | |
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12-09-2006, 11:08 PM
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#4 | | 12 Second Club
Join Date: Aug 2005 Location: Pasadena, CA
Posts: 1,961
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Im taking manual trans clas next semester ( in 3 weeks) I think I will rebuild it myself... How much does it cost for a rebuild with just new synchros, shift links, hardened input shaft and new blocker ring/slider as well?
__________________
2002 pewter M6 Z28, 402..
493RWHP/468RWTQ
((best 1/8 = 7.86 @ 89.25mph on slicks 3.73s (w bolt-on LS1-old engine))) | |
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12-09-2006, 11:21 PM
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#5 | | TECH Senior Member
Join Date: Mar 2004 Location: Dayton, OH
Posts: 7,061
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Are you going from 6th to third or 5th to third without rev-matching? That'll cause problems all by itself...
__________________ 2002 Camaro SS
2007 Toyota Tacoma Quote:
Originally Posted by Hydramatic  All I have to say is FUCK TOYOTA. This is ENTIRELY THEIR FAULT. |  | |
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12-10-2006, 05:29 AM
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#6 | | 12 Second Club
Join Date: Aug 2005 Location: Pasadena, CA
Posts: 1,961
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Quote: |
Originally Posted by MeentSS02 Are you going from 6th to third or 5th to third without rev-matching? That'll cause problems all by itself... | Yes, just downshifting...
It enever did grind before. Ive had the car for 15/16 months and it started this month.
__________________
2002 pewter M6 Z28, 402..
493RWHP/468RWTQ
((best 1/8 = 7.86 @ 89.25mph on slicks 3.73s (w bolt-on LS1-old engine))) | |
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12-10-2006, 05:30 AM
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#7 | | 12 Second Club
Join Date: Aug 2005 Location: Pasadena, CA
Posts: 1,961
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Quote: |
Originally Posted by MeentSS02 Are you going from 6th to third or 5th to third without rev-matching? That'll cause problems all by itself... | Yes, just downshifting...
It never did grind before. Ive had the car for 15/16 months and it started this month.
__________________
2002 pewter M6 Z28, 402..
493RWHP/468RWTQ
((best 1/8 = 7.86 @ 89.25mph on slicks 3.73s (w bolt-on LS1-old engine))) | |
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12-10-2006, 06:25 PM
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#8 | | 10 Second Club
Join Date: Feb 2005 Location: Indiana boy
Posts: 2,566
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My tranny is doing the exact same thing. It only happens when shifting at a very high RPM. Normal driving is ok.
My clutch only has about 4K on it. and the tranny got done at the same time.
I thought it was a master/slave problem and planned on buying both which are only 3 years old now.
I think I to may have a blocker ring or syncro problem. I'm dropping it very soon and I will have RPM check it out while its on the floor.
__________________ 2000 SS, M6-LS6 int, TSP 243's, Torquer V3,arp rod bolts,pace setters,OZ700 clutch,4.10 gear,Wolf CM 6pt.
93 LX coupe-eagle 383 LS1 12.5:1,AFR 205's,T-rex, vic jr,750cfm mighty demon,coan th400 T-brake,TCS 4500,spooled 8.8 4.56. http://i2.photobucket.com/albums/y45...racing_sig.jpg | |
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12-11-2006, 02:32 AM
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#9 | | 12 Second Club
Join Date: Aug 2005 Location: Pasadena, CA
Posts: 1,961
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I thought T-56s were bulletproof!!!! 
__________________
2002 pewter M6 Z28, 402..
493RWHP/468RWTQ
((best 1/8 = 7.86 @ 89.25mph on slicks 3.73s (w bolt-on LS1-old engine))) | |
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12-11-2006, 03:12 AM
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#10 | | Staging Lane
Join Date: Oct 2004 Location: Phoenix, Arizona
Posts: 61
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you know what, samething used to happen to me couple months ago then i installed new spec stage 3 clutch new aluminum flywheel and new slave cylinder and problem was solved. | |
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12-11-2006, 05:10 AM
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#11 | | TECH Resident
Join Date: Dec 2005 Location: Burke, VA
Posts: 887
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The problem you are having is the closest described problem that im having. I Most definetly need a rebuild. Sometimes even when im driving normal it grinds too... I cant wait till tax returns and my new rebuild! 
__________________ Silver 98 Formula DarKnightLS1 | |
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12-11-2006, 10:23 AM
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#12 | | TECH Junkie
Join Date: Nov 2001 Location: Houston,Tx
Posts: 3,534
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No T56 is bullet proof. There is always a chance it will break even with the good parts. I have seen bone stock cars break the cluster. Most of the time it is due to the fact they take it to the track and it wheel hops then hooks.
Thanks,
Amber
T56Rebuilds.com
__________________
02 SOM Z28 M6
8.69@156MPH Worlds Quickest and fastest N/A LS1 M6 T56 | |
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12-12-2006, 08:13 PM
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#13 | | 12 Second Club
Join Date: Aug 2005 Location: Pasadena, CA
Posts: 1,961
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Quote: |
Originally Posted by Ls1Joe No T56 is bullet proof. There is always a chance it will break even with the good parts. I have seen bone stock cars break the cluster. Most of the time it is due to the fact they take it to the track and it wheel hops then hooks.
Thanks,
Amber
T56Rebuilds.com | I just talked to my drivetrain teacher, He is saying its my synchro for sure.
__________________
2002 pewter M6 Z28, 402..
493RWHP/468RWTQ
((best 1/8 = 7.86 @ 89.25mph on slicks 3.73s (w bolt-on LS1-old engine))) | |
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12-15-2006, 07:41 PM
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#14 | | Teching In
Join Date: Dec 2006 Location: South Carolina
Posts: 3
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Quote: |
Originally Posted by MeentSS02 Are you going from 6th to third or 5th to third without rev-matching? That'll cause problems all by itself... |
rev-matching is for clutches, double clutching is for clutches + synchros.
you need a new synchro bud. | |
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12-21-2006, 04:16 AM
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#15 | | 12 Second Club
Join Date: Aug 2005 Location: Pasadena, CA
Posts: 1,961
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When I rebuild My T-56 that needs a synchro, what should I do besides getting new synchros?
__________________
2002 pewter M6 Z28, 402..
493RWHP/468RWTQ
((best 1/8 = 7.86 @ 89.25mph on slicks 3.73s (w bolt-on LS1-old engine))) | |
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