23 tooth speedo gear, yes. I'm getting ready to put in my 3.73s. I presently have 3.55s in right now. they're an improvement but I'm going a step higher. you'll need the fluid 80W 90 some people use other wts. but this is Ford's recomm. (3 quarts but won't use it all), friction modifier (if the fluid doesn't already have it in it), crush sleeve, shims, pinion seal. what brand of ring and pinion are you using? The FMS gears come with pinion nut and crush sleeve.
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1996 Mustang GTS
K&N, removed air silencer, 3.55s, turndowns after H-pipe (no mufflers)
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