Drivetrain Questions and info regarding transmissions, clutches, etc.

Clutch and or 6MT blown

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Old May 25, 2022 | 07:29 PM
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G35 Coupe
Clutch and or 6MT blown

Hey hope anyone seeing this is having a great day. I drive an 04 g35 coupe with a 6MT and yesterday (literally 300ft from a mechanic shop) I had either my clutch and/or transmission give out on me. Mechanic hasn’t even looked at it but thinks just from how it sounded when he pushed it that the tranny is blown as well as the clutch, and I think it’s just the clutch that’s gone.

When it broke, I was shifting into 2nd and it slipped really bad, then kicked me out of gear and would not allow me back into gear with the car turned on. with the car off it allows me in gear. I have been aware that my clutch was going to give out soon so this is not a shock to me, but I personally think the transmission is just fine.

Said they won’t be able to take a look at it for about another week but I was wondering, based off what i’ve been able to describe are we placing bets on the clutch and transmission being toast or just the clutch?

edit: even after not allowing me into gear, the clutch pedal maintained regular pressure. Also for a while now, a fairly pronounced rattling/clicking noise could be heard under my car and at the clutch pedal itself. guessing this situation is more so throw out bearing and flywheel related than transmission failure.
 
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Old May 27, 2022 | 03:01 PM
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Can you put it in 2nd gear with the engine off, then start the car, then release the clutch and drive in 2nd?

If it tries to pull the car forward when starting even though the clutch is depressed then it's probably something on the clutch or pressure plate itself that kaboomed and is no longer disconnecting the clutch when you press the pedal.

 
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Old Jun 17, 2022 | 01:24 PM
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G35 Coupe
Originally Posted by cleric670
Can you put it in 2nd gear with the engine off, then start the car, then release the clutch and drive in 2nd?

If it tries to pull the car forward when starting even though the clutch is depressed then it's probably something on the clutch or pressure plate itself that kaboomed and is no longer disconnecting the clutch when you press the pedal.
just coming back here to help out anyone who may have this problem in the future. The shift fork had broken, therefore causing the problem I was having. front cover of the transmission was also damaged. Moral of the story, change your clutch sooner than later
 
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Old Jun 28, 2022 | 05:00 PM
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G35 Manual
Ouch! Surprising.

At least the majority of the tranny was ok.
 
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Old Jul 1, 2022 | 11:39 AM
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You can replace that crappy stamped steel 2003 early model clutch fork with the significantly improved 2004+ cast iron fork from the later years.
 
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Old Jul 1, 2022 | 12:12 PM
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G35 Coupe
Originally Posted by cleric670
You can replace that crappy stamped steel 2003 early model clutch fork with the significantly improved 2004+ cast iron fork from the later years.
my G is an 04, but surprisingly I believe the clutch that was just replaced was the factory clutch. sounds crazy because my G is at 151k miles but I am the third owner and the second owner claims to have never replaced the clutch and says he purchased the car at around 40k miles. Quite impressive if this is true but makes sense why the failure was so extreme
 
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Old Jul 2, 2022 | 01:44 PM
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Originally Posted by cleric670
You can replace that crappy stamped steel 2003 early model clutch fork with the significantly improved 2004+ cast iron fork from the later years.
I need some advice here. Finally got my car back from the mechanic yesterday after not having it for almost 5 weeks. drove it about 30 miles home and noticed on the way there that 5th and 6th were kinda difficult to get in/ relocated almost and as soon as I got home I could hear a very bad clutch chatter like it is extremely loud. Also noticed when I got home that I guess I drove 30 miles with my engine overheating so that’s great. never had any cooling problems before it went to the shop for the clutch.

I am truly more concerned about the clutch chatter at this point and im wondering if *excessive* chatter is a part of the break in? I went with a JWT 26lb single mass so I understand there was going to be some chatter but this truly sounds like there is something wrong. The clutch itself feels great and there are no vibrations on the clutch pedal, but the noise stops when I depress the pedal. It especially sounds horrible when I press the gas when in low rpms. What do you think, improper install of the clutch and/or throw out bearing or bad transmission?
 
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Old Jul 2, 2022 | 03:13 PM
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6 speed G35 sedan
Originally Posted by aronkroger
my G is an 04, but surprisingly I believe the clutch that was just replaced was the factory clutch. sounds crazy because my G is at 151k miles but I am the third owner and the second owner claims to have never replaced the clutch and says he purchased the car at around 40k miles. Quite impressive if this is true but makes sense why the failure was so extreme
I'm at 203,000 on the original clutch in my '04 sedan. Only the second owner, I very rarely speed shift and have never dumped the clutch at more than 1500-2000 rpm and even then maybe a handful of times in 6 years and 71,000 miles I've had it.
 
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Old Jul 2, 2022 | 05:03 PM
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Firstly, the 5th/6th gear issue, does it feel like the shifter wants to move too far to the right? If that's the problem then they didn't properly set the lockout plate for the shifter, it's inside the cabin, bolted to the floorpan, and there's a little cutout on the right side of it that needs to be adjusted properly. If you slide it too far to the right you can actually push the shifter PAST 5/6 gear, if you slide it too far to the left you can't get into reverse.

Fortunately that's an easy fix. Here's the first youtube video that popped up in my search, he does an ok job explaining the issue at the 6:43 timestamp.


As for the clutch chatter, make a video, post it to youtube, put the link here and it will embed the video. My suspicion is they installed something improperly on the exhaust, but since it goes away when you press the clutch it might be the throwout bearing. Are you sure they installed a new TO bearing?

I have the Z1 Motorsports 13 lb and while I do have SOME clutch chatter, it's mostly something you hear at low rpm when taking off from a stop. Not really too noticable in the cabin at idle but you can definitely hear it under the vehicle with the door open. The 26 lb flywheel normally has significantly less chatter and you should only really notice it when taking off from a stop.

Mine is VERY noisy from a stop though, usually I just rev my engine and pull through the early part of 1st gear though so it's only something I hear when I'm decelerating in gear, rpms drop around 1500, then take off in that same gear. That is EXCEPTIONALLY loud and grindy sounding with a 13 lb flywheel.

The overheating issue is what I'd be most concerned with. Check coolant levels, look for a leak, ask the mechanic if they touched the coolant system. They shouldn't have done anything with it for a clutch job but who knows, someone might have just not screwed the radiator cap on all the way or something simple like that.
 
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Old Jul 3, 2022 | 08:40 PM
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G35 Coupe
Originally Posted by cleric670
Firstly, the 5th/6th gear issue, does it feel like the shifter wants to move too far to the right? If that's the problem then they didn't properly set the lockout plate for the shifter, it's inside the cabin, bolted to the floorpan, and there's a little cutout on the right side of it that needs to be adjusted properly. If you slide it too far to the right you can actually push the shifter PAST 5/6 gear, if you slide it too far to the left you can't get into reverse.

Fortunately that's an easy fix. Here's the first youtube video that popped up in my search, he does an ok job explaining the issue at the 6:43 timestamp.

https://youtu.be/wBNhWn3hO2M?t=403

As for the clutch chatter, make a video, post it to youtube, put the link here and it will embed the video. My suspicion is they installed something improperly on the exhaust, but since it goes away when you press the clutch it might be the throwout bearing. Are you sure they installed a new TO bearing?

I have the Z1 Motorsports 13 lb and while I do have SOME clutch chatter, it's mostly something you hear at low rpm when taking off from a stop. Not really too noticable in the cabin at idle but you can definitely hear it under the vehicle with the door open. The 26 lb flywheel normally has significantly less chatter and you should only really notice it when taking off from a stop.

Mine is VERY noisy from a stop though, usually I just rev my engine and pull through the early part of 1st gear though so it's only something I hear when I'm decelerating in gear, rpms drop around 1500, then take off in that same gear. That is EXCEPTIONALLY loud and grindy sounding with a 13 lb flywheel.

The overheating issue is what I'd be most concerned with. Check coolant levels, look for a leak, ask the mechanic if they touched the coolant system. They shouldn't have done anything with it for a clutch job but who knows, someone might have just not screwed the radiator cap on all the way or something simple like that.
Will get back to you when im able to upload some video, i’ve spent the past few days replacing my entire cooling system with no luck so I got started on the water pump which was the last component to replace and I snapped a bolt off in the block while doing the trick with the longer bolts to separate the water pump from the block so my car is on it’s way back to the mechanic now. Having a real fun time with this car recently lol. everyone is telling me to get rid of it but I love this car way too much
 
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Old Jul 3, 2022 | 08:42 PM
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Wow that sucks, usually with a stuck water pump I just tap it roughly with a wooden drift and a hammer.
 
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