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The standards for the Superformance Mk III are:
Transmission: Tremec 3550/TKO 5-speed (0.68 5th) (typically year 2004 and earlier)
    or Tremec 3550/TKO II 5-speed (0.82 5th) (typically year 2004 and earlier)
    or Tremec TKO-500 and TKO-600 (typically year 2004 and later)
Rear Axle Ratio: 3.73 (Ford unit prior to approximately car number 2068. Optional ratios 3.08, 3.27, 3.55, 4.10, 4.30, 4.56)
    or 3.46 (BTR unit from approximately car number 2068 to 2977. No optional ratios.)
    or 3.45 (ZF unit from approximately car number 2977 on. 3.27 and 2.92 ratios available.)
Rear Tire Size: 275/60-15

The standards for the Superformance Brock Coupe are:
Transmission: Tremec T-56 6-speed (Mustang SVT)
Rear Axle Ratio: 3.46 (BTR unit. No optional ratios.)
    or 3.45 (ZF unit. 3.27 and 2.92 ratios available.)
Rear Tire Size: 285/50-18

The standards for the Superformance GT40 are:
Transmission: RBT Transaxle (5-speed) (use 3.77 rear axle ratio)
    or Quaife ZFQ Transaxle (5-speed) (use 3.75 rear axle ratio)
    or Ford GT Transaxle (6-speed) (use 3.36 rear axle ratio)
Rear Tire Size: 275/60-15

Cautions:

These are calculated potential speeds for gearing evaluation purposes only.

They do not imply that your engine will run as low as 1500 rpm or as fast as 7000 rpm

or that your car is capable of reaching the calculated speeds shown or that such speeds are safe

or that the tire size will fit your car.

Splits:
The "Split" is the ratio of this gear to the previous gear.

The Split should be the same gear to gear or decrease slightly.

If the Split drops then increases as it does with some overdrive gears,

the gear will feel "too tall".

Rev/Mile:
Rev/Mile is engine revolutions per mile, which is rpm at 60 mph.