slight thumping noise

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dkdeleon68
Posts: 203
Joined: Sun Oct 10, 2004 5:23 pm
Car: 1991 240

Post

What would cause a thumping noise in or around the transmission bell housing?you can only hear the noise inside the car and it makes the noise in park.it is the same sound you hear when your tension rod bushings are bad,(the noise you hear when you turn left or right)


180fan
Posts: 7799
Joined: Sat Dec 14, 2002 12:16 pm
Car: 89 fastback

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thumping in the tunnel for the transmission? it could be your transmission shifting around with a blown transmission mount or the carrier bearing for the driveshaft has kicked the bucket.

dkdeleon68
Posts: 203
Joined: Sun Oct 10, 2004 5:23 pm
Car: 1991 240

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180fan wrote:thumping in the tunnel for the transmission? it could be your transmission shifting around with a blown transmission mount or the carrier bearing for the driveshaft has kicked the bucket.
if the carrier bearing is bad would it still let it bounce around even in park?

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rogoman
Posts: 848
Joined: Fri Feb 17, 2006 5:44 pm
Car: 1991 240SX FB
2012 Altima 2.5 S

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When you rev up the motor, does the frequency of the noise change? If you listen under the hood, is there any similar noise coming out of the motor?

dkdeleon68
Posts: 203
Joined: Sun Oct 10, 2004 5:23 pm
Car: 1991 240

Post

no, you can only hear it from inside the car

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rogoman
Posts: 848
Joined: Fri Feb 17, 2006 5:44 pm
Car: 1991 240SX FB
2012 Altima 2.5 S

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rogoman wrote:When you rev up the motor, does the frequency of the noise change?
I'll ask you again, does it change?

dkdeleon68
Posts: 203
Joined: Sun Oct 10, 2004 5:23 pm
Car: 1991 240

Post

no

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rogoman
Posts: 848
Joined: Fri Feb 17, 2006 5:44 pm
Car: 1991 240SX FB
2012 Altima 2.5 S

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If the noise doesn't change when reving up the motor, I would follow 180fan's suggestion about a bad transmission mount or maybe front motor mounts. Also check out the exhaust pipes hitting the body.

dkdeleon68
Posts: 203
Joined: Sun Oct 10, 2004 5:23 pm
Car: 1991 240

Post

I just finished changing the motor mounts, but I haven't started her up yet. I will probably start her in the mourning and I'll give an update on the situation.

dkdeleon68
Posts: 203
Joined: Sun Oct 10, 2004 5:23 pm
Car: 1991 240

Post

seems to fix my problem. it was the motor mounts, thanks for everybodys help.


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