i just swapped to a c4. the c4 came out of my friends 89. i got the full set up that was in his car flexplate converter and trans. i put it in mine and im getting a bad vibration. it will go away if idrive and get the rpms to a certain point then it starts again. it also does it in park or nutreal. hismotor was a 89 so it was 50oz imbalance and i double checked on my build sheet and my motor is 50oz imbalance also. anyone have any ideas? the car didt do this before the swap and all i changed was the trans. are t5and c4 trans mounts the same? somone also told me if the exhuast is hitting anywhere on the car it will make it shake liek hell. one last thing.. could my vibration be the a miss due to that engine to body ground? because it was looking pretty bad. any help ideas apreciated.
