The answer is because high horse power motors can eat the small needle bearings up in the pinion gears. This gear set has been in research and development for over one year. It has been reported that the 2.84 gear set could lower your quarter mile time as much as 4/10 of a second over the 3.06 gear set. In first gear this close ratio gear set has a 7.2% numerically lower final drive ratio. Now you will have a choice between the wide ratio or the new close ratio gear sets. This is common with numerically high final drive ratios. This improves track applications that overpower the rear tires upon launch. This gear set is used to reduce torque multiplication / rotating speed in the transmission in first gear. With the billet sun gear made from 9310M steel.
The carrier is made from E4340 billet steel and the pinion gears are 9310 steel. These will work on any 4L60E type transmission without a gear ratio error code, if the PCM is modified. This is what people have been asking for, for years. In other words the close ratio gear set will only have 88.28% as much RPM drop as the wide ratio gear set.
This close ratio 700R4 gear set will have a 11.72% less RPM drop between 1st and 2nd than the wide (stock) ratio gear set. These will have a 2.84 to 1 first gear, 1.56 to 1 second gear, 1 to 1 third gear and. This will be the biggest thing in 700R4 advancements in years. PATC has developed a new 6 pinion planet gear set for 700R4 / 4L60E transmissions. Description 2.84 Ratio Input Carrier Kit Part No.
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