IMO I would call FTI and this is from a guy who was 1000% an ATI guy. I have not had ANY luck with them the couple years, missing three converters by a ton and my ex$pen$ive glide broke in three passes. Since switching to FTI they have NAILED all 4 converters first shot and our glide in the dragster never gave us one issue with well over 500 passes on it.
Both transmissions are aftermarket cases, one obviously an ATI the other A Reid. Reid can be recerted in Cali ATI has to go back to Pennsylvania. Just something else to consider.