i have 195/65/15 on the driver side and i got 205/65/15 on teh passanger side and 205/65/15 on both rear tires. I wanted to know if the 195(driver side) and 205(pass side) is safe to drive, and will not mess up my tranny. I heard somewhere if you put your donut spare on the front with a full size it will mess up the tranny since they will rotate differently.

 

You really should have the same size on either side of the car. Those two are different diameter.

The dougnut should go on the rear when you use it, and it souldn't be on the car long enough to mess anything up.