Does anybody know the gear ratio of my truck...I have automatic 86 stx ranger.

also..if I slapped 33's underneath it..would my gas mileage go up or down...as far as normal daily driving

Look on the inside of your drivers door it should have a code like K6 or something like that, once you find it post it and i will be able to tell you, you can also look on your rearend there will be a tag on one of the bolts that will say 3 7 3 or something like that depending on what gear.

33's will make your gas mileage worse, mine went down when i bolted mine up.