An aftermarket meeting designed to boost the Basic Motors Turbo Hydra-Matic 400 (TH400) transmission by incorporating an extra gear ratio. This addition successfully reduces the engine’s revolutions per minute (RPM) at cruising speeds. For example, a automobile outfitted with a TH400 and a 4.10 rear axle ratio may expertise considerably decrease engine RPM at 70 miles per hour after the system’s set up, in comparison with its earlier state.
The implementation of this meeting provides a number of potential benefits. A major profit is improved gasoline economic system, because the engine operates at a extra environment friendly RPM vary throughout steady-state freeway driving. Moreover, lowered engine put on and noise ranges can contribute to a extra comfy and doubtlessly longer-lasting automobile. Traditionally, any such improve has been notably engaging to homeowners of basic vehicles and vans initially outfitted with TH400 transmissions, searching for to modernize their autos’ efficiency with out sacrificing the robustness of the unique transmission.
