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What sort of dump truck would be a question here. Typically transmissions for dump trucks (tandem axle and heavier) would include the Allison five, six, and seven speed automatic transmissions, and, as far as manual transmissions go, 8LL, 9, 10, 13, and 18 speed transmissions, like those found on road tractors (save for the 8LL, which is a bit rare to see on a road tractor). It sounds like you're referring to either a 5+2 transmission, which is basically a five speed with a rear end that has two rear end speeds, or possibly the Mack MaxiTorque transmission, which is essentially a five speed with a low gear setting.

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15y ago

What else can I help you with?