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131 0506 Low 02 Z

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The heart of our TH400 build is the low 2.75:1 First gear planetary assembly from John Kilgore Transmissions. The stock ratio is only 2.48, so the deeper gear is a decided advantage for towing and 4x4 use. The stepped sun gear (center) fits into the output carrier assembly with the special planetaries inside (left). It then slides onto the rear internal gear attached to the mainshaft (right).