Here is a question for the OP
@CheeseRules01!
What type of flex plate is behind your 360 right now.
Original mopar 318/904 Flex Plate
View attachment 1715456287
Or this Aftermarket B&M 360 to 904 Flex Plate # B&M 10239 for the 904s.
View attachment 1715456288
Then do you have the weights on your 904 torque converter ?
Or no weights at all (like used on the 318 / 904 applications).
View attachment 1715456289
Working to see if you have the correct Balanced Setup to work with your Externally Balanced 360 with the 904 trans.
The proper selection of balanced parts is what you need, otherwise the imbalance will cause problems like you are experiencing now as things fail, as with the Knock at the Transmission.
