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