Does anyone know the difference? My g6 has a 4t65e trans and it needs replaced I found a good deal on a 4t45e with low miles. Can they be swapped? Is the gear ratio the same? Are the axle splines the same? I'm not much of a transmission guy and can't find any info on this the only thing I know is they look pretty much identical from the time I had to look at it the only difference I could find was the numbers on the I.d tag on them. Any information would be appreciated.