a second synchronizing device for selectively engaging {TAIL ~ the other low speed gear} and the other high speed gear with {HEAD ~ said output shaft} 
a second synchronizing device for selectively engaging { TAIL ~ the other low speed gear } and the other high speed gear with { HEAD ~ said output shaft }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD