ok I have a 94 2.3l 5-speed manual and I have been trying to find the stock rear end gears they put and also stock tire size. I have 31in tires on my truck and reageared to 4.10's but I am looking at going to 4.56's. My trucks just to slow on the freeway. I just want to know in 5th what the max speed I can cruise at with 4.56's and still get good mpg. thanks for all the help