Just looking for some advice on swaping my rear end ratio from 3:73 to 3:55? I'm going to be ordering a new ring & pinion, rebuild kit shortly but I was thinking that swaping the ratio might help a little with the mpg I'm getting. The other thing I haven't found to much info on is the whether or not this sawp will affect my pcm. From what I read the VSS is using the tone ring in the diff, so from that I'm thinking that the gear swap shouldn't effect the PCM? Is this correct? The truck is 2wd, auto and I only tow a car trailer maybe 3% of the time. Thanks.