1st gear grinding??
03-17-2012, 10:02 PM
#1
Racer
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1st gear grinding??
Just got back from a Chin Motorsports day. I noticed after the last session, the car is grinding when I try to engage 1st gear. All the other gears shift normally and smoothly. What's wrong? Clutch?
03-17-2012, 11:30 PM
#2
Race Director
Clutch not disengaging will usually show up in more than one gear.
First gear syncro wear is also not usual.
Here's what I suggest:
Change tranny fluid Redline D4ATF.
Do shifter alignment procedure.
Do Ranger clutch fluid exchange, until it remains clear. Use at least 500 f dry fluid. 600f is better.
Check back after all that & update
That all will cost you about 30 bucks & 1 hour time.
to replace.
03-21-2012, 09:12 PM
#4
Racer
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Pretty sure it's the syncro
I'm pretty sure it's the syncro. If I hold in the clutch for about 5 seconds while leaning lightly on the shifter, I can feel the gear slow down and it let's me into first.
03-22-2012, 04:53 PM
#6
Burning Brakes
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Cire
03-22-2012, 06:13 PM
#7
Race Director
I'd like to follow up with a 1st gear question that may evolve the thread into a solution for the OP.
When I engage 1st gear, I get the slightest forward movement of the vehicle. If you are not actually paying attention to it, you would not notice it.
What do you think that's from?
Original drive train 45k miles 2004 z.
EVERYTHING is maintained 100 %.
Some tranny guru probably has an idea.
When I engage 1st gear, I get the slightest forward movement of the vehicle. If you are not actually paying attention to it, you would not notice it.
What do you think that's from?
Original drive train 45k miles 2004 z.
EVERYTHING is maintained 100 %.
Some tranny guru probably has an idea.
03-22-2012, 07:45 PM
#8
Le Mans Master
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input shaft
The first gear syncrornizer only comes into play when the car is moving. Sitting still, it has no function. What I fear you have is a clutch that is not fully disengaging and which is letting the input shaft continue to rotate with limited torque. When you lean on the shifter, you are applying friction that eventually overcomes that drag.
Cire
Cire
my money is on the clutch slave cylinder
03-22-2012, 08:38 PM
#9
Drifting
I'd like to follow up with a 1st gear question that may evolve the thread into a solution for the OP.
When I engage 1st gear, I get the slightest forward movement of the vehicle. If you are not actually paying attention to it, you would not notice it.
What do you think that's from?
Original drive train 45k miles 2004 z.
EVERYTHING is maintained 100 %.
Some tranny guru probably has an idea.
When I engage 1st gear, I get the slightest forward movement of the vehicle. If you are not actually paying attention to it, you would not notice it.
What do you think that's from?
Original drive train 45k miles 2004 z.
EVERYTHING is maintained 100 %.
Some tranny guru probably has an idea.
Can't get car in gear with engine running. First or reverse. Shut engine off, restart with shifter in first or reverse and clutch works fine. Problem goes away.
Months later similar. Car pulls ahead just a tiny bit with shifter in first and clutch all the way in. Problem goes away.
Months later, problem is back with a vengeance. It comes and goes. I drop it off at dealer and it works perfectly. Replace everything and find that tabs are broken off pressure plate.
03-22-2012, 09:24 PM
#10
Race Director
My experience w 2002 Z06 28,000 miles, plenty of track hours:
Can't get car in gear with engine running. First or reverse. Shut engine off, restart with shifter in first or reverse and clutch works fine. Problem goes away.
Months later similar. Car pulls ahead just a tiny bit with shifter in first and clutch all the way in. Problem goes away.
Months later, problem is back with a vengeance. It comes and goes. I drop it off at dealer and it works perfectly. Replace everything and find that tabs are broken off pressure plate.
Can't get car in gear with engine running. First or reverse. Shut engine off, restart with shifter in first or reverse and clutch works fine. Problem goes away.
Months later similar. Car pulls ahead just a tiny bit with shifter in first and clutch all the way in. Problem goes away.
Months later, problem is back with a vengeance. It comes and goes. I drop it off at dealer and it works perfectly. Replace everything and find that tabs are broken off pressure plate.
Mine is a little different, it moves a very small amount going into gear (easily) but does not creep forward at all once in gear with clutch down.
03-23-2012, 12:31 AM
#11
Le Mans Master
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My experience w 2002 Z06 28,000 miles, plenty of track hours:
Can't get car in gear with engine running. First or reverse. Shut engine off, restart with shifter in first or reverse and clutch works fine. Problem goes away.
Months later similar. Car pulls ahead just a tiny bit with shifter in first and clutch all the way in. Problem goes away.
Months later, problem is back with a vengeance. It comes and goes. I drop it off at dealer and it works perfectly. Replace everything and find that tabs are broken off pressure plate.
Can't get car in gear with engine running. First or reverse. Shut engine off, restart with shifter in first or reverse and clutch works fine. Problem goes away.
Months later similar. Car pulls ahead just a tiny bit with shifter in first and clutch all the way in. Problem goes away.
Months later, problem is back with a vengeance. It comes and goes. I drop it off at dealer and it works perfectly. Replace everything and find that tabs are broken off pressure plate.
03-23-2012, 11:49 PM
#12
Racer
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The first gear syncrornizer only comes into play when the car is moving. Sitting still, it has no function. What I fear you have is a clutch that is not fully disengaging and which is letting the input shaft continue to rotate with limited torque. When you lean on the shifter, you are applying friction that eventually overcomes that drag.
Cire
Cire
10-14-2013, 10:11 PM
#14
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Never did figure this out. I replaced the fluid yesterday with the prescribed GM fluid. 8500 miles now. The stuff coming out seemed to be okay. Still pretty clear, red, and with lubricity. It seems to be the same with the fresh fluid. It's odd because all other shifts are really good, especially when warmed up. I may take it to the dealer, but I'm afraid they will just screw me because of MGW shifter, headers and tune.
10-15-2013, 12:07 AM
#15
Race Director
Never did figure this out. I replaced the fluid yesterday with the prescribed GM fluid. 8500 miles now. The stuff coming out seemed to be okay. Still pretty clear, red, and with lubricity. It seems to be the same with the fresh fluid. It's odd because all other shifts are really good, especially when warmed up. I may take it to the dealer, but I'm afraid they will just screw me because of MGW shifter, headers and tune.
