Under these normal driving conditions, and taking into account {HEAD ~ the characteristics} of the first viscous coupling, the vehicle operates under {TAIL ~ four wheel drive conditions}, moving at an accelerated or uniform speed 
Under these normal driving conditions , and taking into account { HEAD ~ the characteristics } of the first viscous coupling , the vehicle operates under { TAIL ~ four wheel drive conditions } , moving at an accelerated or uniform speed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD 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