STILLEN has finalized the R&D process on a 3.9
gear ratio upgrade for the venerable Ford GT. It is
our goal to produce the type and quality of products that you are
most interested in for your vehicle and want to focus our efforts
accordingly. We believe we have achieved this again with the 3.90
Gear Ratio Conversion.
Why would I want to change the drive ratio
During development of the GT, Ford set many
performance goals some of which were for the sole purpose of
achieving specific paper milestones. As almost every driver knows
paper goals dont always jive with real world practicality and fun.
One such compromise was Fords insistence that the car reach 60mph
without a shift. This was to insure that any editor, journalist or
critic that got his hands on the car would achieve blistering 0-60
times by removing as much driver input, and potential error, as
possible a paper goal.
The compromise with the shift-free 0-60 goal is that gaping
spans of revs must exist. This results in large RPM
drops between gears forcing the engine to work much harder in the
unavoidable low revs as the car claws its way back up into power.
The GT currently overcomes this obstacle with brute
force. This is all the work of the stock 3.3 ratio that creates
something of a no-mans-land at speeds and shift points that are
critical in the real world. Track days and spirited driving benefit
most from a nimble drive ratio that allows the driver to keep the
car in peak horsepower range as often and as quickly as possible.
One should not have to decide between pinging the rev limiter or
plunging the RPM under the power band and waiting as
the supercharger hustles at full boost to push the car back up into
power.
Now you dont have to. Steve Millen, fresh off his grueling week
long track experience with the GT, decided he had
enough of this torque shuffle and teamed up with Ricardo to develop
a gear ratio more befitting a car that demands to be driven. After
all, the world is not paved exclusively with straight lines, turns
are inevitable. In fact true enthusiasts typically seek them out.
The race prep of Steves GT included Penske Coil-Overs,
Eibach Race Springs, an AP Racing Clutch,
AP Racing 6-Piston Front Calipers with 2-Piece
Cross-Drilled and Slotted Front & Rear Rotors,
STILLEN Performance Exhaust and Race Pipes, and a
STILLEN/Eaton Supercharger Upgrade, and yet the cars
performance still suffered substantially from the black holes in
the drive ratio. Immediately upon his return Millen and Ricardo put
to work at solving this deficiency. The result is a perfectly
balanced 3.9 ratio upgrade that can be installed on any
GT by STILLENs specially trained master
technicians. Why Superb agility and more fun from a car that sets a
high standard right out of the box.
Factory 3.3 Ratio
Speed @ Redline
- 1st: 62mph
- 2nd: 95mph
- 3rd: 131mph
- 4th: 171mph
- 5th: 210mph
- 6th: 255mph
STILLEN 3.9 Ratio
Speed @ Redline
- 1st: 53mph
- 2nd: 81mph
- 3rd: 112mph
- 4th: 146mph
- 5th: 180mph
- 6th: 220mph
