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TRQ-7220 Quadruplex Shift Sequence


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Shifting sequence for a TRQ-7220 Quadruplex Transmission

Based on the gearbox ratios I got off another Wiki article, here are all the effective ratios for a TRQ-7220 Quadruplex. You can see where the ratios overlap, and would be skipped. You can also see why some of the LO-LO ratios would not be useful in a progressive sequence. Those could have been used, however, for "road speed control" for specific applications.

I have done this with lots of the other old transmissions as well, if anybody is interested.

Mack Transmissions.xls

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I am Mehrdad Mahmoudzadeh Importer, Exporter and Wholesaler Spare Parts for Truck, Trailer and Bus in Dubai United Arab Emirates.

Please inform me for Transmission TRQ-7220 with 20 Speed by e-mail.

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