i just did a search and could not find the thread im looking for , i think denny did the post, basicly im looking for the rear gear formula, i just did the tire turn trick and came up with i 3/4 driveshaft turns to 1 tire turn, what ratio does that give me?, im running a th350 with p215/75/15 tires and getting about 65mph @ 3000 rpms, i want more speed at less rpm`s