how do I id gear ratio in my rear end i have a '88 ranger that i'd like to see if I could get a little better fuel milage and I don't know what's under there
Check your memory. After 8 or 9 years on the forums, the best (reliable) fuel economy numbers I've ever seen on a 2.9 were 26mpg on the highway at a sustained cruising speed on flat ground. A 2.3 can do 27-28 under optimum conditions. 30 isn't in the range for any Ranger engine.