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Transmission acting funny....

Yont283

By Yont283
in Ask A GM Technician

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Yont283 Enthusiast

Yont283

Posted
Posted

SO, my transmission is acting funny cause I just got a Wait4me tune and it shifts quick and hard just like I wanted it to. BUT, when it is about to shift into third under hard acceleration it feels like it shifts(kinda a thud) and then about a second later it shifts. Really wierd, every other gear is great

 

what is going on??

Yont283 Enthusiast

Yont283

Posted
  • Author
Posted

anybody know?? does this mean its slipping or no??? I really don't want to drive it until I find out what is wrong with it

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

I hate to say it but DUH. If this custom tune screwed something up, remove it. How can we tell you exactly what's going on?

  • 3 weeks later...
Yont283 Enthusiast

Yont283

Posted
  • Author
Posted

update: removed custom tune and put stock back in. The transmission is still doing the same double shift on the 2-3 gear shift. Anyone else have this problem and how much to fix? Thanks, Christian

 

 

 

I hate to say it but DUH.  If this custom tune screwed something up, remove it. How can we tell you exactly what's going on?

 

 

 

ChevyTech007 Enthusiast

ChevyTech007

Posted
Posted

I found this that says its normal. I would not mess with aftermarket programs. There are a few GM program updates that might help. Other than that I would do a flush, you could have a solenoid or valve sticking at times.

 

Subject: Information on 2-3 Upshift or 3-2 Downshift Clunk Noise #01-07-30-042C - (09/27/2005)

 

 

 

Models: 2006 and Prior Light Duty Trucks

 

2003-2006 HUMMER H2

 

2006 HUMMER H3

 

2005-2006 Saab 9-7X

 

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

 

 

 

 

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

 

This bulletin is being revised to add additional model years and information pertaining to the 2005 model year vehicles . Please discard Corporate Bulletin Number 01-07-30-042B (Section 07 - Transmission/Transaxle).

 

 

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

 

Important: For 2005 model year vehicles, refer to Corporate Bulletin 05-07-30-012 or newer.

 

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.

Yont283 Enthusiast

Yont283

Posted
  • Author
Posted

It is not the clunk noise. My problem is the transmission trying to shift into third before it actually does.

 

It feels like a thud and then about a second later the transmission shifts. I don't have the clunk noise stated in the TSB.

 

Does anyone know what this is? Should I change my transmission fluid or is my transmission going out?

 

ps. the truck has 103,000 miles on it now. Didn't do much towing but did haul around my motorcycle alot. Please somebody tell me they had this problem and fixed it without rebuilding. Thanks, Christian

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