Mach 1 4.10 Gears

If you run 4.10 gears you will have to use a speed cal to correct your speedometer, and you will probably have good results with those gears. My dad has an 03 mach 1 and he put 4.30 gears in it and has had absolutely no problems.

795 is correct. All you need with the 4.10 install and a speed cal to correct the speedometer and odometer. Expect to pay b/t $400-$600 for a quality installation.

I can't begin to imagine the pull with 4.10 in a Mach1, you better factor TRACTION into the cost. The stocker tires and suspension may be able to plant the rears at launch, but I doubt it, especially at the red light. A SEVEN-second burnout is required to plant my Nitto's with 4.10 on a 260HP 2000GT, automatic, but once they hook-up, the fun begins.

795.0pacecar said:

If you run 4.10 gears you will have to use a speed cal to correct your speedometer, and you will probably have good results with those gears. My dad has an 03 mach 1 and he put 4.30 gears in it and has had absolutely no problems.

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Same here - just had 4.30's put in my Mach & they are AWESOME!

I had a ton of other stuff done to the rear-end at the same time as the gear swap - Eaton 31-spline differential/31-spline Superior axles/TA Girdle/Axle tubes welded/SpeedCal installed - and I only paid $200.00 labor for everything.

Whether you can re-use the pinion bearing or not will depend on the condition of the one in your car.
A new one is only ~ $20.00, and you're better-off replacing it during the swap if it's condition is suspect.
The same is also true for the axle bearings/axle seals/etc.

Parts you will definately need are:

Pinion nut
Crush Collar
Shims
Friction Modifier
80/90 weight gear oil
Cover Gasket
SpeedCal
Pinion Bearing (Most likely)

IMHO, if you pay over $200.00 - $250.00 for a gear swap (you supply the parts), you're paying too much...

Check with your dealer for installation costs. Have them install Ford Racing parts and your warranty will not be effected... Even if they charge a little more than $250, keeping the warranty is worth it, IMHO.