That depends on what make and model of fifth wheel you have... they're not all universal.
If you have an adjustable fifth wheel, the release and locking switch will be on the dash to the right of the steering wheel and instrument panel, located in the same cluster where the differential lock and suspension air dump switches are located.
The Fifth Wheel - 1918 was released on: USA: 2 February 1918
You have to have a trailer attached to do this. Lower the landing gear to the ground to take pressure off the fifth wheel. DO NOT RELEASE THE TRAILER KING PIN. Go into the cab. To the right of the instrument panel, you'll see the switch for the fifth wheel slide. Unlock the fifth wheel. Pull backwards or forwards (whichever direction you're moving the fifth wheel). When you get it to where you want it, lock the fifth wheel. Pull forward or backwards slightly to ensure the fifth wheel is locked in place.
Climax - 1954 The Fifth Wheel 2-20 was released on: USA: 9 February 1956
250 lbs/ft with Dana-Spicer axles, although the purpose of the cone is to prevent over torquing, so it doesn't matter if you want to go higher.
The Nanny - 1993 The Fifth Wheel 4-14 was released on: USA: 29 January 1997 Germany: 10 May 1999
It's fifth wheel, and it means not needed or not wanted, as in a fifth wheel on an automobile.
Gotta find out what's wrong with the fifth wheel. If the jaws are stuck, the horseshoe might need to be replaced, or the whole thing might have to be rebuilt. But, ensure that the fifth wheel is properly adjusted, and that there's no pressure on the jaws when you try to release it.
The Fifth Wheel - 1918 is rated/received certificates of: USA:Approved
not sure, but probably due to spare wheel(fifth wheel) used to be kept in pickup bed, which is where fifth wheel hitch goes. ==Not quite == In the days of horse-drawn wagons, the fifth wheel was a wheel placed horizontally over the front axle of a large wagon to facilitate turning. Basically, it allowed the front axle to pivot. Today, the coupler of a tractor-trailer truck is called the fifth wheel, mostly because it's round (somewhat) and is vaguely reminiscent of the wagon's fifth wheel (which much more closely resembled the wagon's other four wheels).
A man called Rudolph Steingass invented the fifth wheel and build a company producing and distributing them.
Assuming you're talking about the Vehicle Speed Sensor, and not a Wheel Speed Sensor, it's located on top of the transmission, just about the transmission output shaft. Unplug the weatherpack terminal, unthread the VSS, installation is the opposite of removal.