C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

Bad gear synchros?

Thread Tools
 
Search this Thread
 
Old Jun 9, 2006 | 08:13 PM
  #1  
99HRDTP's Avatar
99HRDTP
Thread Starter
Drifting
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 1999
Posts: 1,669
Likes: 98
From: Jacksonville FL
Default Bad gear synchros?

I'm having a problem shifting gears after a new clutch install. It's only been 200 miles, but it's getting harder and harder to get the car in gear. Missed a couple of 4-5 shifts. Grinding noise one time going into reverse. Thought it might be air in the line not allowing full disengagement, but no luck. Installer suggesting that the gear synchros might be going bad. Any thoughts? Thanks.
Reply
Old Jun 9, 2006 | 08:19 PM
  #2  
Ranger's Avatar
Ranger
Race Director
Supporting Lifetime Gold
10 Year Member
 
Joined: Aug 2000
Posts: 10,649
Likes: 31
From: Central Florida
Default

If you have problems after a clutch install that didn't exist before the clutch install, suspect the install.

So was the issue present before this clutch?

Ranger
Reply
Old Jun 10, 2006 | 06:45 AM
  #3  
99HRDTP's Avatar
99HRDTP
Thread Starter
Drifting
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 1999
Posts: 1,669
Likes: 98
From: Jacksonville FL
Default

Originally Posted by Ranger
If you have problems after a clutch install that didn't exist before the clutch install, suspect the install.

So was the issue present before this clutch?

Ranger
Ranger-

I started to have some issues before, which is what drove me to do the clutch in the first place. It seems that things have worsened since the replacement though.

----
Mike
Reply
Old Jun 10, 2006 | 07:02 AM
  #4  
Ranger's Avatar
Ranger
Race Director
Supporting Lifetime Gold
10 Year Member
 
Joined: Aug 2000
Posts: 10,649
Likes: 31
From: Central Florida
Default

Is there a thread you can point me to where you tell the story of the (1)symptoms that led you to replace the clutch and (2) details of what clutch parts were replaced?

We are talking about the 99 FRC? I don't find a profile of the car, its mods etc....

Ranger
Reply
Old Jun 10, 2006 | 05:21 PM
  #5  
99HRDTP's Avatar
99HRDTP
Thread Starter
Drifting
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 1999
Posts: 1,669
Likes: 98
From: Jacksonville FL
Default

Originally Posted by Ranger
Is there a thread you can point me to where you tell the story of the (1)symptoms that led you to replace the clutch and (2) details of what clutch parts were replaced?

We are talking about the 99 FRC? I don't find a profile of the car, its mods etc....

Ranger
Ranger-

Yes, we are talking about the '99. It has about 72,000 miles on it. Mods include a stage 2 heads and cam package in addition to LT headers, intake manifold, air filter, exhaust, throttle body, computer reprogram, etc. plus a 150 hp nitrous shot not used for over a year.

The symptoms started last year. I started to have more and more slipping of the clutch, especially with higher RPM shifts. Also, it would get harder to shift into 2nd and 3rd without a slight grinding feeling. This all lead me to believe that the original clutch had finally given up the ghost and needed replacement.

While in Iraq, I ordered a complete LS7 clutch and flywheel from Fred Beans. We also replaced the master and slave with LS6 parts. These were then sent with the car to a well-reputed Corvette specialist for install.

Since the install, it's become harder and harder to get through the gears. This has become progressive over the last 200 miles, and has included several times where I missed getting into 5th gear from 4th. I finally brought it back to the installer and upon pulling in and switching quickly from 2nd to reverse, the gears ground loudly and refused to engage. They (the gears) finally relented after several tries, and that's where we stand.

I hope this helps.

-----
Mike
Reply
Old Jun 10, 2006 | 05:30 PM
  #6  
Ranger's Avatar
Ranger
Race Director
Supporting Lifetime Gold
10 Year Member
 
Joined: Aug 2000
Posts: 10,649
Likes: 31
From: Central Florida
Default

Originally Posted by 99HRDTP
Ranger-

Yes, we are talking about the '99. It has about 72,000 miles on it. Mods include a stage 2 heads and cam package in addition to LT headers, intake manifold, air filter, exhaust, throttle body, computer reprogram, etc. plus a 150 hp nitrous shot not used for over a year.

The symptoms started last year. I started to have more and more slipping of the clutch, especially with higher RPM shifts. Also, it would get harder to shift into 2nd and 3rd without a slight grinding feeling. This all lead me to believe that the original clutch had finally given up the ghost and needed replacement.

While in Iraq, I ordered a complete LS7 clutch and flywheel from Fred Beans. We also replaced the master and slave with LS6 parts. These were then sent with the car to a well-reputed Corvette specialist for install.

Since the install, it's become harder and harder to get through the gears. This has become progressive over the last 200 miles, and has included several times where I missed getting into 5th gear from 4th. I finally brought it back to the installer and upon pulling in and switching quickly from 2nd to reverse, the gears ground loudly and refused to engage. They (the gears) finally relented after several tries, and that's where we stand.

I hope this helps.

-----
Mike
Thanks, that's helpful.

(1) Has the tranny ever been repaired, rebuilt or upgraded?
(2) How many nitrous runs are on the car?

Ranger
Reply
Old Jun 10, 2006 | 06:33 PM
  #7  
1998 GTR's Avatar
1998 GTR
Drifting
 
Joined: Apr 2005
Posts: 1,509
Likes: 1
From: Lafayette CA
Default

I recently baought a '98 coupe with 100k miles on it. It was difficult to get into first gear at times, plus I'd sometimes miss a shift in 2nd, 3rd and/or 4th on hard fast shifts. I've had a MN6 '98 vert for the last 2 years, so I know how it SHOULD shift. Something was definitely amiss!

I figured my synchros were just about toast, but I had all my fluids changed, including the tranny. It gradually got better, and after a few hundred miles it now shifts as it should.

So you might try a fluid change before dumping more $$$ into it. Worth a try anyway!

Good luck!

Dave
Reply
Old Jun 10, 2006 | 11:33 PM
  #8  
99HRDTP's Avatar
99HRDTP
Thread Starter
Drifting
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 1999
Posts: 1,669
Likes: 98
From: Jacksonville FL
Default

Originally Posted by Ranger
Thanks, that's helpful.

(1) Has the tranny ever been repaired, rebuilt or upgraded?
(2) How many nitrous runs are on the car?

Ranger
1. No, nothing has ever been done to the tranny.
2. Over the years, I've probably been through 3-4 bottles max.

----
Mike
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-1

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-2

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-3

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-4

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-5

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-6

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-7

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-8

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-9

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
Old Jun 10, 2006 | 11:36 PM
  #9  
99HRDTP's Avatar
99HRDTP
Thread Starter
Drifting
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 1999
Posts: 1,669
Likes: 98
From: Jacksonville FL
Default

Originally Posted by 1998 GTR
I recently baought a '98 coupe with 100k miles on it. It was difficult to get into first gear at times, plus I'd sometimes miss a shift in 2nd, 3rd and/or 4th on hard fast shifts. I've had a MN6 '98 vert for the last 2 years, so I know how it SHOULD shift. Something was definitely amiss!

I figured my synchros were just about toast, but I had all my fluids changed, including the tranny. It gradually got better, and after a few hundred miles it now shifts as it should.

So you might try a fluid change before dumping more $$$ into it. Worth a try anyway!

Good luck!

Dave
Dave-

Thanks for the input. Years ago, after installing the Ripper shifter, she shifted like a dream. I agree that a $60 fluid change is much better than a $3000 tranny.

Mike
Reply
Old Jun 11, 2006 | 12:50 AM
  #10  
servohead's Avatar
servohead
Burning Brakes
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2004
Posts: 792
Likes: 19
From: ME
Default

I'm noticing some crappyness going into second gear and general difficulty getting into gears and the forum suggested in unison to put synthetic ATF in (Amsoil) and that would solve my problems. Well see, I ordered the amsoil today!
Reply
Old Jun 11, 2006 | 05:47 AM
  #11  
Ranger's Avatar
Ranger
Race Director
Supporting Lifetime Gold
10 Year Member
 
Joined: Aug 2000
Posts: 10,649
Likes: 31
From: Central Florida
Default

Originally Posted by 99HRDTP
1. No, nothing has ever been done to the tranny.
2. Over the years, I've probably been through 3-4 bottles max.

----
Mike
Given the history, you must shift well.

As others have said swapping the tranny fluid is an easy first step. If that doesn't clear the issues, then I'd suggest contacting Rodney, owner of RPM Transmissions in Indiana. He builds bullet-proof trannies at prices that are competitive with what the local dealer or tranny shop will charge for a rebuild. Actually, right now Rodney has a deal on that includes free shipping.

Ranger

Last edited by Ranger; Jun 11, 2006 at 12:08 PM.
Reply
Old Jun 11, 2006 | 11:41 AM
  #12  
C66 Racing's Avatar
C66 Racing
Premium Supporting Vendor
20 Year Member
Conversation Starter
All Eyes On Me
Top Answer: 1
 
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Default

Mike,
Don't think I can add to what Ranger's already said, but wanted to say that is a pretty impressive showing of cars in your sig. I especially like the Crossed Flags on the Porsche.

Good luck with your tranny.
__________________


C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)





Reply
Old Jun 11, 2006 | 05:26 PM
  #13  
99HRDTP's Avatar
99HRDTP
Thread Starter
Drifting
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 1999
Posts: 1,669
Likes: 98
From: Jacksonville FL
Default

Originally Posted by Ranger
Given the history, you must shift well.

As others have said swapping the tranny fluid is an easy first step. If that doesn't clear the issues, then I'd suggest contacting Rodney, owner of RPM Transmissions in Indiana. He builds bullet-proof trannies at prices that are competitive with what the local dealer or tranny shop will charge for a rebuild. Actually, right now Rodney has a deal on that includes free shipping.

Ranger
Thanks, Ranger. I'll give the fluid swap a try, and if that doesn't solve things, then I'll give Rodney a call.

Any consensus on which ATF to use?

----
Mike
Reply
Old Jun 11, 2006 | 05:29 PM
  #14  
99HRDTP's Avatar
99HRDTP
Thread Starter
Drifting
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 1999
Posts: 1,669
Likes: 98
From: Jacksonville FL
Default

Originally Posted by Subdriver
Mike,
Don't think I can add to what Ranger's already said, but wanted to say that is a pretty impressive showing of cars in your sig. I especially like the Crossed Flags on the Porsche.

Good luck with your tranny.
Thanks, Shipmate!

I told my wife that the only way I'd let her trade her Z71 Tahoe for the Cayenne was to wear the Corvette license plate as well!!

----
Mike
Reply
Old Jun 11, 2006 | 08:54 PM
  #15  
C66 Racing's Avatar
C66 Racing
Premium Supporting Vendor
20 Year Member
Conversation Starter
All Eyes On Me
Top Answer: 1
 
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Default

Originally Posted by 99HRDTP
Thanks, Shipmate!

I told my wife that the only way I'd let her trade her Z71 Tahoe for the Cayenne was to wear the Corvette license plate as well!!

----
Mike


Looks like she agreed.
Reply
Old Jun 12, 2006 | 12:31 PM
  #16  
99HRDTP's Avatar
99HRDTP
Thread Starter
Drifting
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 1999
Posts: 1,669
Likes: 98
From: Jacksonville FL
Default

Originally Posted by Subdriver


Looks like she agreed.
That she did - it was a win-win situation for me as well.

While we gave up some room in the back for our dogs, in return, we got sports car handling in a vehicle that can tow 7700 pounds!!

Now if only I could afford the Cayenne Turbo S!!!

----
Mike
Reply
Old Jun 12, 2006 | 11:44 PM
  #17  
C66 Racing's Avatar
C66 Racing
Premium Supporting Vendor
20 Year Member
Conversation Starter
All Eyes On Me
Top Answer: 1
 
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Default

Originally Posted by 99HRDTP
That she did - it was a win-win situation for me as well.

While we gave up some room in the back for our dogs, in return, we got sports car handling in a vehicle that can tow 7700 pounds!!

Now if only I could afford the Cayenne Turbo S!!!

----
Mike
The Cayenne can tow 7700 lbs? That's the same rating (more or less) as my wife's Chevy Trailblazer. I'll have to look into the Cayenne more than I have.
Reply

Get notified of new replies

To Bad gear synchros?

Old Jun 13, 2006 | 08:56 PM
  #18  
99HRDTP's Avatar
99HRDTP
Thread Starter
Drifting
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 1999
Posts: 1,669
Likes: 98
From: Jacksonville FL
Default

Originally Posted by Subdriver
The Cayenne can tow 7700 lbs? That's the same rating (more or less) as my wife's Chevy Trailblazer. I'll have to look into the Cayenne more than I have.
Rated at 7716 pounds and 616 pounds max tongue weight. Dimensions as follows: Length 188.3 in
Width 75.9 in
Height 66.9 in
Wheelbase 112.4 in
Drag coefficient (Cd) .39
Curb weight 4,949 lbs
Tiptronic S
Capacities Luggage compartment volume 19.1 cu ft
Fuel tank capacity 26.4 gal

Trailblazer rates as follows:

Wheelbase 113.0 in
Length 191.8 in
Height (without luggage rack) 72.50 in
Rear seat up 39.7 cu ft
Rear seat folded down 70.0 cu ft
Towing 5400-6400 lbs (depending on rear end)
Curb weight 4,773 lbs (4x4)

So, they're pretty comparable in overall size, with the Chevy getting the nod for interior room....but can't compare in ride and handling. Give one a test drive, I think you'll like it.

----
Mike
Reply
Old Jun 13, 2006 | 11:09 PM
  #19  
C66 Racing's Avatar
C66 Racing
Premium Supporting Vendor
20 Year Member
Conversation Starter
All Eyes On Me
Top Answer: 1
 
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Default

Thanks for the info Mike. I really had no idea the Cayenne was rated to tow that much. My wife has the 5.3L V-8 in her Trailblazer EXT with the trailer towing package. I thought it was rated to tow over 7000 lbs, but looking at Chevy's website shows 6500 for her truck.

When I get a minute I'll go check one out.
Reply
Old Jun 15, 2006 | 07:31 AM
  #20  
99HRDTP's Avatar
99HRDTP
Thread Starter
Drifting
Supporting Lifetime
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 1999
Posts: 1,669
Likes: 98
From: Jacksonville FL
Default

Originally Posted by Subdriver
Thanks for the info Mike. I really had no idea the Cayenne was rated to tow that much. My wife has the 5.3L V-8 in her Trailblazer EXT with the trailer towing package. I thought it was rated to tow over 7000 lbs, but looking at Chevy's website shows 6500 for her truck.

When I get a minute I'll go check one out.
My pleasure. Enjoy and good luck!!

----
Mike
Reply




All times are GMT -4. The time now is 07:56 AM.

story-0
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-1
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-2
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-3
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-4
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-5
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-6
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-7
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-8
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-9
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE