i would double-check the damper. it should look different than 318/340 dampers wich are neutrally ballanced. otherwise , did you use the same tranny as with the 318? it could be the trans internally or the torque(318) has the hub partially broken (i have seen it before in 904s).could it be your 318 did have the hub broken and then you installed the new torque with the broken piece still laying inside the trans ??? it would do exactly as described plus some noise coming from the trans probably... check the 318 torque hub just to make sure it wasnt broken