545 rfe trans easier?

No reflash is needed to operate the 545rfe trans if using the factory computer (05 and up). 03-04 computers (ecm and tcm) are the bastards, so use an 05 and up, way more tuning and adjustments.

There is no aftermarket efi that is compatible with the 03-04 tcm, so no options there. Talk to sharadonperformance as they build the 545rfe trans to handle some big power, also they can tune the tcm side of the computer to alter shift patterns, firmness, etc. if ya just want alittle more than the factory programming, also some cmr tuners are capable of doing it also.