Hello,
It will change your speedometer/odometer. By my calculations on just the size of the tires (all manufacturers tires are not standard) you will be off a little more than 1%.
So, if your speedometer says 100mph, you will actually be going about 101.2mph.
inicated 50mph on the speedo will translate to 50.6mph.
For me, this is not a big deal and well within what I would consider normal. For comparison, mine is off by about 7%. At 100mph on the speedo, I'm actually traveling at 107mph. 50mph is 53.5mph...
Tranny? I wouldn't think it would even know there is a change.
Rob