The "Tranny Trick" resets the transmission ratios closer together and provides much quicker shifting in the upper rpm ranges. Higher horsepower cars make use of tighter ratios by staying in the "sweet spot" of the horsepower curve more than with stock ratios. Lower horsepower cars, or cars with more torque than horsepower, are best served with stock or wider ratios and do not benefit from the trans trick.


More into it.. (convo between BTWhite37 and Lister-StormV12, 3/9/06)

What's it all about, what does it achieve?

As I understand it............ The tighter ratios allow for the car to not have to "pull the gear" from way down low in ther RPM range. The car "bangs" off shifts much quicker without having to pay the penalty of lugging the engine. The RPM of the higher horsepower cars remain in the "Sweet spot", or just plain screamin' all the time.
Remember, torque (twisting force), is generated low in the rpm range, and horsepower (momentum of the engine spinning), is a product of the rpm at high revs.

The "Tranny Trick" goes like this.

1st,........ Reset your transmission ratios by clicking on default setup for transmission tuning if you've messed with them.

2nd,....... Set the Final Drive to 5.500 or max. setting.

3rd,....... Run the Auto Set to 25, and then down to 1, and then leave it there.

Finally,..... Set your Final Drive for each track allowing for max. rpm, (or just before the rev limiter), in top gear at the end of the longest straight section.