what is the rear end ratio for a V8 explorer 4x4 with tow package

you are probably going to want to get your hands on a Chilton or Haynes manual. It will tell you all the specs you need to know. They are available at any autoparts store.

Standard axle ratio on all V-8 models is 3:55. Same on the V-6 models; however a 3:73 ratio option is available on the V-6 with the Class III/IV trailer package but is not available on the V-8 models.