so bit of a back story.
2005 impala ls, 3.8l gear ratio 3:05.
I bought a 2011 buick lucerne transmission, 2:86 gear ratio. only 6000 kilometres on it.

The plan was to take my 3:05 gears and install them into the new buick trans. and install a transgo shift kit.
so we took these parts out of my trans and put it into the buick trans.


with the old trans first gear would go from 0-50mph then shift to 2nd.
now with the new trans i go to 55-56 mph before it shifts....
I have no check engine light, would the check engine light come on if the gear ratio is 2:86?
everything else works 100% it shifts like it was brand new, love it, just wondering if i actually did change my gear ratio and if so why does it shift at 55 mph not 50 mph like it used to.