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Loud Clunk Noise When Accelerating To Decelerating


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Hi I hope somebody can help me out.... I just purchased 140k mile 95 LS400 a month ago. I am trying to fix Loud Clunk noise when accelerating to let go gas peddle at highway speed from underneath (transmission area) and when shift P to R or Drive clunk also, especially when cold 1500rpm idle. What I have done is Replaced Flex Coupling on differential side (it was cracked), 3 bushing on Differential (was broken), rear trading arm busings. Engine mounts and transmission mount has been replaced before I purchased. Trans fluid level is good and clean. What else I should check for this problem. Transmission problem?

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