output linkage 141 and a longitudinal output linkage 143 referring now to fig4 7 the preferred embodiment of longitudinal boost assembly 125 is illustrated assembly 125 is a unity feedback moving body hydro mechanical device longitudinal boost assembly 125 comprises a longitudinal boost assembly mount 145 longitudinal boost assembly input lever 147 hingedly attached to mount 145 longitudinal boost assembly output lever 149 also hingedly attached to mount 145 longitudinal boost assembly adjustable hard stops 151 longitudinal boost assembly hydraulic unit 153 and longitudinal direct link 155 hard stops 151 are adjusted to contact input lever 147 and output lever 149 before over travel of ccs 111 components occurs hydraulic unit 153 comprises a hinged portion 157 hingedly attached to mount 145 and a translating portion 159 attached to hinged portion 157 such that translating portion 159 may translate along hinged portion 157 translating portion 159 is also hingedly attached to output lever 149 hinged portion 157 is connected to input lever 147 with direct link 155 which is connected to a piston locking bar 181 discussed infra for actuating a control piston 179 discussed infra such that if input lever 147 is moved toward hydraulic unit 153 direct link 155 moves locking bar 181 to actuate hydraulic unit 153 in a manner causing translating portion 159 to translate along hinged portion 157 in the direction of movement supplied by input lever 147 similarly if input lever 147 is moved away from hydraulic unit 153 direct link 155 moves locking bar 181 to actuate hydraulic unit 153 in a manner causing translating portion 159 to translate along hinged portion 157 in.