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Knocking Noise When Shifting

  • Thread starter Thread starter DRock9
  • Start date Start date Sep 25, 2006
D

DRock9

New Member
Aug 22, 2006
359
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0
Sep 25, 2006
#1
  • Sep 25, 2006
  • #1
There is this weird knocking noise when i shift, i hear it the most going into 2nd and 3rd. It happens right as i let off on the clutch and step on the gas, my Dad said it might be a bad u-joint. I usually shift below 2k to try to save gas and thats when i hear it the most, because its quiet in the car. Whenever i shift at 2.5k+ i can never hear it so I can't tell if it happens or not. So i have two questions:

Does anyone know what this knocking noise could be?

And also, is it bad for the car to shift at low RPM's as long as it doesnt buck and jolt? I can shift below 2k very smoothly, the only thing that happens is the knock I am talking about.

Thanks for any and all help!
 

88gt

Founding Member
Aug 2, 1999
794
0
0
Drillers cabin
Sep 25, 2006
#2
  • Sep 25, 2006
  • #2
First check the bolts at the rear flange of the driveshaft and make sure they are tight. If so, remove driveshaft and get checked for balance/bent/u-joint problems. Around here, all that would run you abour 60-85 bucks.

As for the short shifting....not a problem as far as I know. I've short shifted several times...no problems by doing that.

Jim
 

Mavrick

Founding Member
Aug 29, 2002
2,264
0
46
Collingwood, ON
Sep 25, 2006
#3
  • Sep 25, 2006
  • #3
A bad U joint is pretty easy to spot on your own.. put the rear end on stands, slide under the car and inspect the u-joints and driveshaft.
 
T

tylerdred

Founding Member
Sep 26, 2001
75
0
6
Chicago, IL
Aug 4, 2007
#4
  • Aug 4, 2007
  • #4
Same Problem

DRock9 said:
There is this weird knocking noise when i shift, i hear it the most going into 2nd and 3rd. It happens right as i let off on the clutch and step on the gas, my Dad said it might be a bad u-joint. I usually shift below 2k to try to save gas and thats when i hear it the most, because its quiet in the car. Whenever i shift at 2.5k+ i can never hear it so I can't tell if it happens or not. So i have two questions:

Does anyone know what this knocking noise could be?

And also, is it bad for the car to shift at low RPM's as long as it doesnt buck and jolt? I can shift below 2k very smoothly, the only thing that happens is the knock I am talking about.

Thanks for any and all help!
Click to expand...

i was wondering if anyone knew the answer to this question because my 89 mustang notch 5 spd starting making that same noise too....any advice? do I need a new tranny?
 

85_SS_302_Coupe

it sucks (I know) to be on the receiving end
15 Year Member
Nov 11, 2003
6,945
1,598
223
Northern KY
Aug 4, 2007
#5
  • Aug 4, 2007
  • #5
Definitely sounds like universals to me.
 

Roland69

Sergeant Tangnet
Sep 17, 2005
2,867
3
58
Port Elgin, Ontario
Aug 4, 2007
#6
  • Aug 4, 2007
  • #6
or controll arm bushings or cracked or torn torque box (boxes)
 
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