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I have a 2008 wrangler unlimited, auto, 50,000 miles. The torque converter has been replaced three times under warranty . It is back for a 4th but chrysler now thinks it is a computer software problem. however they do not know how to fix it. It shutters at around 50 MPR and when RPMs drop to 1000-1500. Any Ideas?
 

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First have they flushed the transmission everytime they replaced the TC? If so how dark was the oil? Since this has happened multiple times i doubt this shudder but it is possible? There is way to figure out if it is probable shudder. Find the road grade, engine rpm, gear, throttle position and speed that it shudders. Once you have this figured out go to the dealer. They should be able to drive the jeep under the same conditions and force the vehicle to unlock the TCC (torque converter clutch). If the issue goes away then it is most likely shudder. Shudder is basically the TCC sticking and slipping due to multiple reasons. Usually it has to do with the friction paper on the clutch being glazed although it can have to do modes in the transmission lighting up. The best thing to do would be to have the TC opened up and see if the paper is glazed (usually dark spots)
 
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