I just swapped in 3.55s from an automatic into my 96 w/ ax15 and have 27.1" tires and according to go-jeeps speedo chart I need a short shaft 36 tooth speedo gear, even though the auto with 3.55s and 27.4" tires came with the 35 tooth speedo(it would be a lot closer to correct mph than the 31 tooth I currently have). Are the automatics and manual speedo gears interchangeable or tranny specific? Any of you big tire/gear swap guys have a 35 or 36 tooth short shaft gear lying around?