So I have a 1991 Jeep cheroke lorado with the l6 motor. The person that owned it before me had the front drive shaft in the back seat with no universal joint so I bought one and put it in. My four wheel drive works but won’t kick out no matter what I do or try. I’ve tried throwing it in reverse and at 10-15 mph and everything else I’ve read and no luck. One thing I noticed was all the vacume lines that’s for the 4x4 acuator are completely gone. Could that be the problem? And how do I go about running new ones should I just find one at a junk yard with the lines and put them on mine? It has the shifter in the floor. 4 low , n, full time for wheel drive , part time four wheel drive and 2 high. I know it’s in 4x4 cause the front wheels jerk on black top