There are two trans gear ratios so be sure to get what matches your trans. The 4 / low power 6 got deeper ratios than the high power 6 / 8 and 12.

The other issue is mixing early / late valve bodies and TCU so buy the ATRA manual and do some research as they have it all laid out. ( $30 , don't poach it as they put a lot of effort into this book )