Both sets are stationary with {HEAD ~ respect} to a transmission housing, i.e. there is {TAIL ~ no sliding motion} of any gear 
Both sets are stationary with { HEAD ~ respect } to a transmission housing , i.e. there is { TAIL ~ no sliding motion } of any gear
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH