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Well my 95 4L60E thats mated to a 4.3 V6 has some torque converter shudder, I think. I just got a new engine put in 7K miles ago, and ever since then it makes the vibration/shudder at 2800-3200RPM, but since I've dropped the pan and changed filter/filled with Mobil 1 and then pulled the drain plug two days later and filled with Supertech ATF its at a different RPM now but a little more often. Any advice guys?

Thanks,

Joe
 

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i had the same thing goin on with my 93... i dropped the pan and changed fluid and filter but when i added new fluid i added this stuff from lucas oil products. i think its called trans tune? anyway its this real thick ATF additive and i put bout 1/2 qt in there and filled the rest up with dex and it hasnt shuddered since. its a big while bottle from lucas oil products ill look for it later on to get ya the name
 
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