It’s no secret that American Powertrain (APT) offers 5 and 6 speed transmission swaps for many popular classic Mopars. These swaps are made possible with their Hydramax hydraulic clutch setup. Although the Hydramax system plays a huge role in their 5 and 6-speed swaps, they offer the Hydramax system for the classic 23 and 18 spline A833 4-speeds too.

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