Never checked the I4, but the V6 are all the same in the 5 speed auto. Which happens to be slightly different then the 5-speed auto in the Titan with a V8. Yet another reason you can't use the V6 trans with a V8, the computer will look at the ratios and notice it isn't a match for the programming. You can get a "incorrect ratio" code. Yes, that is a real code that the computer can generate.