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Knocking noise


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Need help here.

I thought it was something simple but I couldn't figure this out last night. I just got done with a 3AT - > 5 Speed D/R conversion. Everything works fine. However, when I accelerate and then unload the tranny (push in the clutch) the tranny unloads and bumps the dog house. I can feel it hit and hear the load whump. This only happens when I pop the clutch fast, when I shift smooth its fine. I checked the tranny mount and its nice and snug, but I can push the tranny up and down a bit. All three engine bolts are tight too? The rear tranny shifter support is tight also. Anything else that could cause this?

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to what rallyruss says, that strut on the top my be out of adjustment, thats what mine did after an engine reinstall, I was able to see the engine move around with the hood open and having the ebrake on let the clutch out a little in 1st gear. That stut stops the movement if properly adjusted.

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