Cruise control

[KEYSJUNK]

Has anyone obtained a service manual on the factory units for the Dodge Motor homes.  I have a 1977, 21ft. rear kitchen, Dodge.  440 power.  The unit engages OK, but not at the proper speed that it was set at.  If you engage it at 55 MPH, it locks in at 45 MPH.  Is there an adjustment on the unit to correct this? :?:

[Robert P. Anderson]

THERE IS A SMALL SCREW IN THE CONTROL BLOCK WHERE THE SPEEDOMETER CABLES COME IN AND OUT. THIS LOOKS LIKE A CARBIATOR ADJ SCREW.  BE CAREFUL TO NOT MOVE THE SCREW  TOO MUCH. THE SCREW IS HARD TO FIND. IT RUNS SIDEWAS ON
THE TRANSMITION SIDE  OF THE CONTROL BLOCK