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Please, who knows about this issue and possible solutions and what are the troubles this will bring if it keep doing that loud banging noise so often. This is a jap auto transmission swap from the stock one that got damaged from supposed water flood early this year.

This problem rarely happened with the older transmission and it is doing it so often that is killing me inside. I know with this transmission I have engine light on since installed and parking, drive shifting had to be added a support so it stayed in place but other than that not sure what else unless the rpm, trans and engine computer might be the problem???