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Gearbox weird sound in 3rd gear PT GT

 
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Old 31 May 2017, 02:26 am
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Default Gearbox weird sound in 3rd gear PT GT

My 5 speed manual gearbox makes a weird noise when driving in 3rd gear, between 2000 and 4000 rpm. It's a metallic sound, which is only heard when I accelerate. If I raise my foot from the gas, the sound stops. It is only heard in 3rd gear and only when I accelerate over 2000 rpm. The sound is sharpened as if rubbing two metal parts on each other. The sound increases in intensity at the same time as the acceleration I put the atf4 in the box, 2 liters, I'm not sure if it's the right amount. Has anyone ever encountered this problem?
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Old 31 May 2017, 07:46 am
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Default Re: Gearbox weird sound in 3rd gear PT GT

Does the car pull into and out of third easier than other gears? As in is there less resistance pushing pulling the shifter
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Old 31 May 2017, 01:49 pm
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Default Re: Gearbox weird sound in 3rd gear PT GT

No. It is only the noise.
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Old 02 Jun 2017, 05:53 am
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Default Re: Gearbox weird sound in 3rd gear PT GT

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Originally Posted by Cristian View Post
My 5 speed manual gearbox makes a weird noise when driving in 3rd gear, between 2000 and 4000 rpm. It's a metallic sound, which is only heard when I accelerate. If I raise my foot from the gas, the sound stops. It is only heard in 3rd gear and only when I accelerate over 2000 rpm. The sound is sharpened as if rubbing two metal parts on each other. The sound increases in intensity at the same time as the acceleration I put the atf4 in the box, 2 liters, I'm not sure if it's the right amount. Has anyone ever encountered this problem?
most likely to be an exhaust component like a loose catalytic converter, heat shield or other metalic object. it's just being 'tuned' to make noise at the exact frequency.
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Old 02 Jun 2017, 04:58 pm
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Default Re: Gearbox weird sound in 3rd gear PT GT

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Originally Posted by _PTGT03 View Post
most likely to be an exhaust component like a loose catalytic converter, heat shield or other metalic object. it's just being 'tuned' to make noise at the exact frequency.
I don't think so...if i press the clutch, the sound disapear...the sound appear only when the car is moving, only in 3rd gear...i think is something in the gearbox, a bearing or something...
Does somebody knows of the non turbo 2.4 pt gearbox is the same like the one on gt?
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Old 02 Jun 2017, 05:29 pm
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Default Re: Gearbox weird sound in 3rd gear PT GT

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Originally Posted by Cristian View Post
I don't think so...if i press the clutch, the sound disapear...the sound appear only when the car is moving, only in 3rd gear...i think is something in the gearbox, a bearing or something...
Does somebody knows of the non turbo 2.4 pt gearbox is the same like the one on gt?
It's not. The GT uses a Getrag 288. I believe the non-turbo uses a New Venture 350. I believe it is the same trans used in the Neons. The SRT4 Neon uses the New Venture 850. Not sure about swapping them, but it is probably more trouble than it is worth.
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Old 04 Jun 2017, 06:16 pm
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Default Re: Gearbox weird sound in 3rd gear PT GT

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Originally Posted by Fk5 View Post
It's not. The GT uses a Getrag 288. I believe the non-turbo uses a New Venture 350. I believe it is the same trans used in the Neons. The SRT4 Neon uses the New Venture 850. Not sure about swapping them, but it is probably more trouble than it is worth.
I've notice that the 2.2 diesel engine, use the same getrag288 gearbox, but with bigger ratio in first and second gear. The 3rd, 4th and 5th are almost the same. What will it be if i'll put a 2.2 diesel gearbox on my 2.4 turbo pt?
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Old 05 Jun 2017, 09:05 am
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Default Re: Gearbox weird sound in 3rd gear PT GT

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Originally Posted by Cristian View Post
I've notice that the 2.2 diesel engine, use the same getrag288 gearbox, but with bigger ratio in first and second gear. The 3rd, 4th and 5th are almost the same. What will it be if i'll put a 2.2 diesel gearbox on my 2.4 turbo pt?
I have no idea, but as a long time GT owner/driver, I can tell you that the only things I would change about mine would be to put a taller O/D on it for MPG. the mileage takes a pretty steep dip as you start getting up around 80 (and over). I guess they wanted closer ratios because compared to the super tall o/ds in some of my cars (Daytona for instance) the PT still pulls pretty good in 5th. Personally, I would rather just have 5th be strictly for gas mileage and downshift if I need/want more.

Only other things I've had issue with are the multi-layer (whatever it is called) flywheel coming apart at 100,000 miles and making it difficult to shift and impossible to pull out of gear.

There seems to be an issue with my throwout bearing too. It seems like all my cars get this. Makes a mechanical noise in neutral, put the clutch in and it disappears. My Dad and I have shared a bunch of cars over the years, they have all gotten some version of this noise, but they have gone tons of miles (several over 150K) and it hasn't seemed to hurt anything. His SRT8 was making it from almost new and the dealer basically convinced him "it was normal." I guess we do something that causes it, but we have done most of our driving in NYC, so way more shifts per mile than your average driver and <knock wood> the only major issues have been the flywheel on the PT and several $18 clutch cables on 2.2 T1s.
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Last edited by Fk5; 05 Jun 2017 at 12:00 pm.
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Old 05 Jun 2017, 10:26 am
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Default Re: Gearbox weird sound in 3rd gear PT GT

Quote:
Originally Posted by Cristian View Post
I don't think so...if i press the clutch, the sound disapear...the sound appear only when the car is moving, only in 3rd gear...i think is something in the gearbox, a bearing or something...
Does somebody knows of the non turbo 2.4 pt gearbox is the same like the one on gt?
First, I've never played with a Getrag 288S. But I have worked on lots of manual transmission from years gone by.

There's a chance this is just a misaligned shifting fork. It's possible that the shift linkage bushings are worn and causing a misalignment while in third gear. This is something easy and inexpensive to check out before going into the transmission shop. I'd inspect and possibly change out these inexpensive and often worn bushings before taking my PT to a shop.
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Old 05 Jun 2017, 11:22 am
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Default Re: Gearbox weird sound in 3rd gear PT GT

Have you tried just changing the trans fluid first?

Mine make a little noise in 5th while cruising too. But my exhaust is so loud now I can't hear it lol!
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