![]() Adding more speeds to a transmission helps efficiency: Extra gears allow for a wider spread of ratios and let the engine keep the revs low whenever possible, saving fuel. ![]() The popularity of the 8HP isn't all that surprising given current industry trends. If you count every make, model, body style, and driveline configuration, the number of places where this transmission shows up is enormous. You can find the 8HP paired to 25 different engine families in vehicles sold in the United States. Underneath the disparate bodies lies a shared automatic transmission-the ZF 8HP eight-speed, from German-based auto-parts supplier ZF Group. But as the cliché goes, appearances can be deceiving. ![]() One is the acme of automotive extravagance the other epitomizes blue-collar, working-class values. The $400,000 Rolls-Royce Phantom and $24,0 don't appear to have much in common.
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