Strange noise
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Elder User
Joined: Nov 1999
Posts: 796
Likes: 3
From: Anderson Northern Ca
Strange noise
I have a kind of metal to metal light grinding noise under acceleration but it stops as soon as I push the clutch in.Inline 300 With a NP.435 and 205 case.The noise is not what I would hear coming from a tranny,it's more like the noise that a brake drum would make with a busted spring hanging up inside.I'm thinking it's the pressure plate with a bad finger arm. Can anyone think of anything else that would make this type of noise. It is definatley coming from the tranny and bellhousing area,thanks in advance.Clutch and throwout bearing are 2 years old, I dont know about the pressure plate.
"bowties in the rearview mirror"
"bowties in the rearview mirror"
Senior User
Joined: Jul 1999
Posts: 472
Likes: 1
From: USA
Strange noise
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Is it noisy in 1st, 2nd, and 3rd only, but quiet in 4th? If so, it is the input bearing or countershaft bearings of the transmission.
I have heard noisy throwout bearings when they are dragged lightly and then quiet down when the clutch pedal is pushed in (more load on the bearing). How much freeplay is in the clutch pedal before the pressure plate is contacted? The specification is listed in the service manual. The "juice" (hydraulic) clutch in newer trucks is not adjustable, and the throwout bearing spins all of the time.
Art
Is it noisy in 1st, 2nd, and 3rd only, but quiet in 4th? If so, it is the input bearing or countershaft bearings of the transmission.
I have heard noisy throwout bearings when they are dragged lightly and then quiet down when the clutch pedal is pushed in (more load on the bearing). How much freeplay is in the clutch pedal before the pressure plate is contacted? The specification is listed in the service manual. The "juice" (hydraulic) clutch in newer trucks is not adjustable, and the throwout bearing spins all of the time.
Art
Thread Starter
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Elder User
Joined: Nov 1999
Posts: 796
Likes: 3
From: Anderson Northern Ca
Strange noise
Thanks for the reply Art.Well I finally went out an took a close look at the underside of the truck and have to admit I made a rookie first diagnosis.I checked the drivelines with the tranny in gear and the emergency brake on,had I blocked the wheels and checked the thing in neutral it would have been obvious that the u-joint behind the transfer case was totally torn up,stump pulling!!A new u-joint front and rear totally solved the noise and vibration,thanks for the help and advice.
"bowties in the rearview mirror"
"bowties in the rearview mirror"
Senior User
Joined: Jul 1999
Posts: 472
Likes: 1
From: USA
Strange noise
[font size="1" color="#FF0000"]LAST EDITED ON 01-Feb-01 AT 11:32 PM (EST)[/font][p][font size="3" color="#191979"]
You're welcome, glad to hear it's fixed.
Thank you for the reply, as putting closure to the thread lists an answer for the next person who's searching through the thread down the road...
Art
You're welcome, glad to hear it's fixed.
Thank you for the reply, as putting closure to the thread lists an answer for the next person who's searching through the thread down the road...
Art
