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6 speed Shift Problems

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Old 12-24-2011, 11:16 AM   #1
mizellbe
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Default 6 speed Shift Problems

I recently purchased a 2007 ZO6 from an individual. I have had the car about 3 months and am now having probvlems shifting into 2nd gear.
Shifting into 2nd gear had a slight bind and now most of the time it refuses to go into gear.
At idle I can shift into 2nd with no problem, it is only when I am under acceleration. This car only has 7300 actual miles.
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Old 12-24-2011, 11:29 AM   #2
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Quote:
Originally Posted by mizellbe View Post
I recently purchased a 2007 ZO6 from an individual. I have had the car about 3 months and am now having probvlems shifting into 2nd gear.
Shifting into 2nd gear had a slight bind and now most of the time it refuses to go into gear.
At idle I can shift into 2nd with no problem, it is only when I am under acceleration. This car only has 7300 actual miles.
Hard to say based upon limited info, but my first thought would be the 2nd gear synchro going bad. Presuming you were able to tranfer the warranty when you bought the vehicle, I would have it looked at by a reputable dealer mechanic, i.e. one who regularly works on Vettes.
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Old 12-24-2011, 11:37 AM   #3
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is it the CAGS. Make sure you're at or over 19 mph to shift into second.
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Old 12-24-2011, 11:43 AM   #4
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Quote:
Originally Posted by mizellbe View Post
I recently purchased a 2007 ZO6 from an individual. I have had the car about 3 months and am now having probvlems shifting into 2nd gear.
Shifting into 2nd gear had a slight bind and now most of the time it refuses to go into gear.
At idle I can shift into 2nd with no problem, it is only when I am under acceleration. This car only has 7300 actual miles.
about ditching the cags. Also check or change the fluid in the clutch master cyl. Check and or change trans. oil.
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Old 12-24-2011, 12:24 PM   #5
CO Lightfoot
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Might be a combination of things that are slightly off, such as a weak/damaged synchro, shift linkage, etc. Cooler weather (longer warm-up) might also contribute.

For starters, look at the clutch fluid. Changing it might be worth a try:



But I'm guessing that won't fix the problem. Might need a trip to the dealer.

Also if you get a chance, drive another C6 and see how it compares.
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Old 12-24-2011, 01:01 PM   #6
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Originally Posted by budgreen3564 View Post
is it the CAGS. Make sure you're at or over 19 mph to shift into second.
.... Possibly the skip shift locking out 2nd as designed?

Last edited by Mrc100; 12-24-2011 at 01:10 PM.
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Old 12-24-2011, 02:02 PM   #7
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Quote:
Originally Posted by mizellbe View Post
I recently purchased a 2007 ZO6 from an individual. I have had the car about 3 months and am now having probvlems shifting into 2nd gear.
Shifting into 2nd gear had a slight bind and now most of the time it refuses to go into gear.
At idle I can shift into 2nd with no problem, it is only when I am under acceleration. This car only has 7300 actual miles.
Like others have noted, it appears you are trying to shift into 2nd gear when the CAGS is locking you out. Have you noticed the 1->4 light on the face of the tach lighting up? When it's lit, a solenoid in the transmission is locking out 2nd gear and makes you shift to 4th gear. You can purchase a CAGs eliminator that gets rid of this nuisance for $20. Then you can drive your car and shift it into second gear when it feels natural to you, instead of when the computer thinks it's appropriate.

It's covered in your owners manual.
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Old 12-24-2011, 02:09 PM   #8
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Quote:
Originally Posted by JoesC5 View Post
Like others have noted, it appears you are trying to shift into 2nd gear when the CAGS is locking you out. Have you noticed the 1->4 light on the face of the tach lighting up? When it's lit, a solenoid in the transmission is locking out 2nd gear and makes you shift to 4th gear. You can purchase a CAGs eliminator that gets rid of this nuisance for $20. Then you can drive your car and shift it into second gear when it feels natural to you, instead of when the computer thinks it's appropriate.

It's covered in your owners manual.
2007 owner's manual, page 193.

Quote:
One-to-Four Shift Light
(Manual Transmission)

When this light comes
on, you can only shift
from FIRST (1) to
FOURTH (4) instead of
FIRST (1) to
SECOND (2).

You must complete the shift into FOURTH (4) to
turn off this feature. This helps you get the
best possible fuel economy.

After shifting to FOURTH (4), you may downshift
to a lower gear if you prefer.

Notice: Forcing the shift lever into any gear
except FOURTH (4) when the 1 TO 4 SHIFT light
comes on may damage the transmission.
Shift only from FIRST (1) to FOURTH (4) when
the light comes on.

This light will come on when:
The engine coolant temperature is higher than
169F (76C),
the vehicle is going 15 to 19 mph
(24 to 31 km/h) and
the vehicle 21 percent throttle or less.
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Old 12-24-2011, 03:02 PM   #9
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I generally shift from 1 to 3 if I'm just putting around...4th seems to bog the motor a little. Sorry for going off topic.
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Old 12-26-2011, 06:06 PM   #10
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This is an issue that is relatively common with the T56 / TR6060, so I am told.

I am having an identical issue with my 2007 Z51 equipped C6. 2nd works just fine at low revs and even at high, steady revs but rapidly increasing revs (acceleration) will cause it to grind every single time.

I have changed my clutch fluid, flushed the transmission fluid, installed a CAGS eliminator, installed an MGW short throw shifter and installed a TICK adjustable clutch master cylinder and ALL have failed to solve the problem.

Therefore I have come to the conclusion that it must be a 2nd gear synchro. You may be having the same issue as I am. I'll be getting this fixed ASAP, and I'll let you know how hard I was banged for it.
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Old 12-26-2011, 08:25 PM   #11
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My hard shift turned out to be a rebuild and main shaft upgrade. 3 grand later shifts great. Mine had 90000 mi. so I would get it done under warranty if I were you.
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Old 12-26-2011, 08:29 PM   #12
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Most likely the skip shift if not anything major.
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