Overdrive Transmission - Mopar Overdrive Conversion Kit
The Hemi part of the conversion consists of this beefy, 18-spline input shaft, also known as the drive pinion. Only factory-assembled Hemi and 440 Mopars got the bigger 1.14-inch, 18-spline shaft, thus the term "Hemi box." All the rest (383s, 340s, and so on) got smaller, 0.960-inch, 23-spline inputs (top). The new pinion requires a matching 18-spline clutch disc.
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