![]() Lube channels direct oil to the pinion pins, and the carrier can be disassembled for inspection and service. ![]() Manufactured and engineered for outstanding durability, the carrier’s gears are precision-ground to OE standards, thrust washers feature highly wear-resistant PTFE-coated material and the captured bearing is thicker late design. This keeps performance engines in the optimal power band while allowing a longer pull in first and second gears, improving consistency and performance. Sonnax 2.84 input carrier kit 77284-K transforms the popular 4L60 series from an OE “wide ratio” 3.06/1.63 to a “close ratio” 2.84/1.55 for game-changing acceleration on the track. ![]() The shift from 3.06 ratio (1st gear) to 1.63 ratio (2nd gear) is a dramatic RPM drop that causes performance engines to fall out of their power band. The steepest first gear ratio of any four-speed automatic (3.06) belongs to the GM 4L60 (700-R4)/4L60-E family of transmissions. Description 2.84 Ratio Input Carrier Kit Part No.
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