RED98Z28 said:
i did that with my old car & it was still off 5-20 mph. i should have just got a chip, or speedo recal. it might just have been my experience, but i don't think so. i think ole mrvax has had his fair share of trouble with those plastic gears 
I studied the superstallions website and corral. Both are linked off of "jim's mustang mods" (see link below). It took me aproximately 5 hrs. I did the install at the local auto hobby shop on the air force base that I live on. If you know someone who is in the military and can let you use their onbase hobby shop, then doing the gears yourself is a viable option beacuse the hobby shops have 90% of the tools you need. I had access to a 60 ton hydraulic press,torque wrenches, a lift, etc. If you can't do this, I would suggest letting a mechanic do it. The average price I found was around 175-200 dollars. Some were as high as 400 though. Gene Evans Racing and Stangstore.com have the cheapest prices on gears.Talk to Martin at stangstore and he will help you out. I haven't drove the car yet though, I have a few more things to finish up with it. I enjoy working on my car, and I am a average "D.I.Y."mechanic and I felt it was worth the five hours to do it myself. The only hard part was getting the crush collar to start "crushing". Took a four foot cheater bar to get it to start!
