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Tranny Quesion!

bajakid2

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bajakid2 Enthusiast

bajakid2

Posted
Posted

Hey,On my 2007 GMT900 5.3, I cant take the clunking between 2-3!! taken it to the dealer over 9 times they still wont do anything!..so iv decided to take it into my own hands now, What can i do to get this to stop!? Ill pay honestly up to replacing the transmission with a HD rebuilt one?? what upgrades would stop it from clunking??

thanks

Travis

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted

Its normal.....

 

 

Service Information 2007 Chevrolet Silverado - 4WD | Sierra, Silverado (VIN C/K) Service Manual | Document ID: 2394678

--------------------------------------------------------------------------------

 

#01-07-30-042F: Information on 2-3 Upshift or 3-2 Downshift Clunk Noise - (Feb 5, 2010)

 

 

Subject: Information on 2-3 Upshift or 3-2 Downshift Clunk Noise

 

 

Models: 2010 and Prior GM Passenger Cars and Light Duty Trucks

 

2010 and Prior HUMMER H2, H3

 

2005-2009 Saab 9-7X

 

with 4L60-E, 4L65-E or 4L70-E Automatic Transmission (RPOs M30, M32, M70)

 

 

 

Important: For 2005 model year fullsize utilities and pickups, refer to Corporate Bulletin 05-07-30-012.

 

Some vehicles may exhibit a clunk noise that can be heard on a 2-3 upshift or a 3-2 downshift.

 

During a 2-3 upshift, the 2-4 band is released and the 3-4 clutch is applied. The timing of this shift can cause a momentary torque reversal of the output shaft that results in a clunk noise. This same torque reversal can also occur on a 3-2 downshift when the 3-4 clutch is released and the 2-4 band applied. This condition may be worse on a 4-wheel drive vehicle due to the additional tolerances in the transfer case.

 

This is a normal condition. No repairs should be attempted.

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted

At the last couple Black Bear tune meets we had here,Justin was able to get a lot of it out of some guys trucks that had it.

sab316 Enthusiast

sab316

Posted
Posted

I use to get a real bad clunk... took it in to the dealer and it helped a little. But after my tune it is a TON better. Don't get me wrong it still does it some but mostly when I'm coming to a real sudden/fast stop.

bajakid2 Enthusiast

bajakid2

Posted
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Posted

Hey, Its generally honestly gotten worse over time..still noisy as heck with my blackbear tune,Even with the radio up i can still feel it clunk into 3rd..might be just because i know its there haha. I was just curious what exactly in the transmission causes the clunking? thanks for all the help.

Travis

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