The system comprises a first synchronizing device for selectively engaging a second speed gear and a fourth speed gear with an output shaft of the transmission, a second synchronizing device for selectively engaging {HEAD ~ a first speed gear} and a third speed gear with the output shaft, a first shifter arm for operating the first synchronizing device, and {TAIL ~ a second shifter arm} for operating the second synchronizing device 
The system comprises a first synchronizing device for selectively engaging a second speed gear and a fourth speed gear with an output shaft of the transmission , a second synchronizing device for selectively engaging { HEAD ~ a first speed gear } and a third speed gear with the output shaft , a first shifter arm for operating the first synchronizing device , and { TAIL ~ a second shifter arm } for operating the second synchronizing device
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