Hi Luis, u sure can. The lx tranny is cable actuated and so is the dx tranny. The lx tranny will fit to the d15 block in the dx. It shouldnt be any problem at all. Bolt the lx tranny on then hook up the tranny cable, and ur done. Of course make sure the flywheel, clutch disk, and pressure plate are all hooked up. U can use the dx or lx pressure plate, clutch disk, or flywheel...Since it is a d-series engine any d-series tranny will bolt up. But since the car is a older 91 dx the tranny would be cable operated..92 and newer civics use a hydrolic tranny actuator. Pm me if u need any help. Thanx

-Braxton