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Sonnax 2.84 Ratio Input Carrier Kit

Sonnax 2.84 Ratio Input Carrier Kit

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Quick Overview

SONNAX 6 PINION 2.84 INPUT PLANET ASSY 4L60, 4L60-E, 4L65-E, 4L70-E 77284-K


Carrier Assembly
Input Sun Gear
The steepest first gear ratio of any four-speed automatic (3.06) belongs to the GM 4L60/E family of transmissions. The shift from 3.06 ratio (first) to 1.63 ratio (second) is a dramatic ratio change, allowing engine RPM drop that results in performance engines falling out of the optimal power band. The Sonnax 2.84 input carrier kit 77284-K changes these popular units from a "wide ratio" 3.06/1.63 to a "close ratio" 2.84/1.55 configuration with more desirable RPM drop between 1-2 and 2-3 shifts. This keeps performance engines in the optimal power band while allowing a longer pull in first and second gears, improving consistency and performance.

This high-quality carrier has several advanced design features: the gears are precision-ground to OE standards, thrust washers are highly wear-resistant PTFE-coated material and the captured bearing is thicker late design. Lube channels direct oil to the pinion pins and the unit can be disassembled for inspection and service.

Six-pinion design with advanced durability features
Keeps engine in power band on 1-2 and 2-3 shifts
Allows longer pull in first and second gears
No special tools or machining required

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