1979 Dodge Colt rwd 4 cyl vin k 1600 cc 4 spd manual how to adjust reverse?

On this car you have to push down on shifter while in 4 th gear to engage reverse. the gears just grind even if I try to start the car while in reverse. Its like its not traveling car enough down towards the ground, this transmission has a hydraulic clutch. reservoir is full, and have no problems shifting in fwd gears 1-4. What do i have to do to adjust reverse?
 
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