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  #1  
Old 08-22-2017, 01:24 AM
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Unhappy Transmission Shudder

Hi everyone!

I just bought a 03 4.4i and it has some transmission problems. The first thing I noticed was that when driving at steady speed around 50mph the rpm slightly fluctuates. This doesn't happen when driving steady but faster 70 - 80mph.

Then I realized that when driving around town, it shakes when changing from 3rd to 4th almost always. It goes away if I press the gas or if drived in manual mode. When happens it feels like driving through a bumby road.

Do you have any idea how can I Fix this problem?

Thanks!
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  #2  
Old 08-22-2017, 02:42 AM
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Quote:
Originally Posted by jfwongb View Post
Hi everyone!



I just bought a 03 4.4i and it has some transmission problems. The first thing I noticed was that when driving at steady speed around 50mph the rpm slightly fluctuates. This doesn't happen when driving steady but faster 70 - 80mph.



Then I realized that when driving around town, it shakes when changing from 3rd to 4th almost always. It goes away if I press the gas or if drived in manual mode. When happens it feels like driving through a bumby road.



Do you have any idea how can I Fix this problem?



Thanks!


Try a couple of tubes of shudder fix. Amazon sells it. Probably the torque converter.
Wouldn't hurt to try it.


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  #3  
Old 08-22-2017, 11:31 AM
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There's a flex plate between the driveshaft and transmission aka Guibo. Check the condition of that before wasting your money on shudder fix.
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Old 08-22-2017, 02:15 PM
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It could be a numbers of things. I would first look into the rubber driveshaft couplers. Perform a drop drain of the trans fluid. And these trucks are notorious for valve body issues.
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Old 08-23-2017, 04:32 PM
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Thanks very much guys, I will check the guibo and then I will try with shudder fix.
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  #6  
Old 09-20-2017, 12:13 PM
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Had this problem myself and it is the lockup clutches in the torque converter.
Put somr Dr-Tranny in the box and it will clear up for a short time but that will confirm what i am saying.
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Old 09-20-2017, 07:05 PM
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Thanks AlanGunn!

Did you fixed the problem? How much money aprox did it cost you?

Thanks!
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  #8  
Old 09-21-2017, 01:06 AM
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I had a refurbished torque converter fitted with new filter and oil.
Cost me 470 but that was 3 years ago.
No problem since and a nice smother gear change as well.
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