Transmissions and Drivetrain Need help with your trans? Problems with your axle?

Knocking Noise when In Gear

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Old Mar 5, 2008 | 10:00 PM
  #1  
bbq014's Avatar
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Joined: Feb 2006
Posts: 65
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From: Long Island, NY
Car: '88 IROC
Engine: 350 TPI
Transmission: T-5
Axle/Gears: 9", Locker, 4.10's
Knocking Noise when In Gear

Hey guys,

When I'm in gear i get a knocking noise that gets faster with speed (not rpm).

When i'm rolling and i push the clutch in and leave it in gear it stops, also when i'm in neutral.

This is in all gears, at all speeds.

What could it be, a friend of mine said rear end, but thats relatively new.

But then again I got my rear from Chris Caprio who isn't exactly getting rave reviews.

Anyone have this problem or know whats up?

Thanks

Tim
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Old Mar 5, 2008 | 10:22 PM
  #2  
Batass's Avatar
Supreme Member
 
Joined: Mar 2005
Posts: 1,665
Likes: 3
From: Benzie, MI
Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
Re: Knocking Noise when In Gear

Definitely something in your trans, I'd drain the fluid and look for metal.
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Old Mar 5, 2008 | 10:26 PM
  #3  
402 GTA's Avatar
Junior Member
 
Joined: Dec 2006
Posts: 41
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From: Lansing Illinois
Car: 86 GTA
Engine: 402 cbb
Transmission: th350
Axle/Gears: 9" 3.50
Re: Knocking Noise when In Gear

Maybe throw-out bearing.
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Old Mar 6, 2008 | 09:45 AM
  #4  
bbq014's Avatar
Thread Starter
Junior Member
 
Joined: Feb 2006
Posts: 65
Likes: 0
From: Long Island, NY
Car: '88 IROC
Engine: 350 TPI
Transmission: T-5
Axle/Gears: 9", Locker, 4.10's
Re: Knocking Noise when In Gear

yeah i was thinking either the throwout bearing or clutch fork or something...

going to take it to the shop today so hopefully it's nothing too major.

thanks guys,

Tim
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Old Mar 7, 2008 | 03:12 AM
  #5  
Pat Hall's Avatar
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Joined: Nov 2000
Posts: 3,347
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From: Roy,UT USA
Re: Knocking Noise when In Gear

Sounds like broken or chipped teeth on the gears inside the trans to me. Only one gear has to have broken teeth for it to happen since no matter what gear you're in, all of them spin against the big cluster gear. I broke 2nd gear in my Muncie a few years ago, and it did the same thing your car is doing. I'd recommend not driving it until you figure out the problem. I got lucky and only had to replace 2nd gear since I took it straight home and parked it. If you keep driving it with a broken gear, it'll take out the cluster gear, which is expensive to replace.
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Old Mar 7, 2008 | 06:31 PM
  #6  
bbq014's Avatar
Thread Starter
Junior Member
 
Joined: Feb 2006
Posts: 65
Likes: 0
From: Long Island, NY
Car: '88 IROC
Engine: 350 TPI
Transmission: T-5
Axle/Gears: 9", Locker, 4.10's
Re: Knocking Noise when In Gear

Well, my friend was right...

something in the center section of my rear is shot.

so i'm having the whole center section rebuilt with new gears at Action Performance in Bohemia, NY. i learned my lesson from buying from unreliable sources from the internet.

time to scrounge up some cash!

mission: trans delayed once again lol

Thanks guys
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Old Mar 7, 2008 | 06:42 PM
  #7  
Batass's Avatar
Supreme Member
 
Joined: Mar 2005
Posts: 1,665
Likes: 3
From: Benzie, MI
Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
Re: Knocking Noise when In Gear

Makes sense if its on the load side of a tooth. Turned it by hand and felt it?
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