Jeff they don't make an exact 3.7 ratio like Ford has but they do make 3:73 ratio (which is basically the same) but you'll be extremely lucky if you find a used set. I just bought a new set of 3:73's for mine and put them in. Their Motive gear brand. I haven't had much experience with gears but just wanted to let you know I couldn't get the pattern exactly centered up and even had a experienced rear end guy look at them and he said I had it the best it would get. They howl some down the road. Especially at 50 mph. Just letting you know in case you run across that brand. I'm not particularly happy with them making the noise. Wish I would have spent the extra for better gears but I thought they'd be ok.