so..i have a problem...i recently swapped a 1994 4.0L ax-15, np231, into my 1989 PREVIOUSLY a 4.0l aw4, np231...my problem is that the axle on the 94 jeep that i got the drivetrain from was not a vacuum axle and my 89 is...so...considering the fact that i had to use the t-case from the 94...how will i make my front hubs engage? is it possible to take the vacuum valve out of the 89 t-case..and hook it into the existing vacuum lines in the 89 engine bay and then just run it into the cab and when i want to lock the front end in i just push in the button on the valve...i ask this b/c that is all the t-case appears to do to this mechanism...when you put it into 4wd the rod comes out and pushes on the ball thing to open the valve....and the 94 t-case doesnt have the same rod thing to push on the valve..b/c the 94 wasn't a vacuum axle jeep...so can i do this just by hand or am i guna have problems..PS i do NOT want to pay some 200 dollars for a cable lock thing...any help appreciated!