Originally Posted by bonser216

ok so, i diagnosed my issue. i found that my 4wd locking unit was leaking. i know you said all your stuff was replaced. which means it "should all be working" buttt. if you want to diagnose the issue and try to figure it out, take the vacuum lines off the actuators at the wheels with the truck running, you should get some vacuum there. if you do that that means everything to there should be working. then take a vaccum pump that you can buy at auto zone for cheap and put some manual vacuum to the actuator. that should hold vacuum. if it doesn't then there is an internal leak. if it does then try to free spin the wheel with vacuum. if it spins seperatly from the axle then your actuator is working properly. if those are working with manual vacuum then you definatly have a vaccum leaking issue in a line somewhere.

Originally Posted by rigrat2011

Damn... i just read somewhere on another thread about vacuum on the 4x4's and was going to say something....

But youre one step ahead of the game.

Originally Posted by bonser216

haha, the system is actually really simple to figure out. vacuum operation is pretty obvious to diagnose.