On my 2000 gmc z71 is there any kind of vaccum lines on the front differential or transfer case to engage the 4wd and make the front tires move. i know for a fact that the transfer case is locking and the front actuator is working on the fromt diff. i need to know for a 2000 gmc z71 pick up not no jimmys s10 or blazers

SOURCE: 2002 GMC Z71 WHEN PUTTING

Hello tmaxx31190
Start by checking fuse #7 a 15amp fuse in the fuse block under the left side of the dash. This fuse is for the accuator motor on top of the left front axel tube. The accuator moter engages and
disengages the front axel for 4wd and 2wd. If the fuse is good, have someone operate the switch
and check to see if the accuator is working, you should be able to hear it engage or disengage.
If it's not working check the connections and for power at the accuator before possibly changing it.
If the accuator is working, it could be a problem with the shift fork inside the differential. Also, have
someone start the truck and engage the 4x4 then look to be sure the output shaft from transfer case to the front axel is turning. The safest way to do this is to have all 4 wheels up on jack stands.
Hope this is helpful.

SOURCE: I have a 96 gmc jimmy i have changed the actuator,actuator cable,all the vac lines,vac switch and switch on differential and still the front tires dont engage,the transfer case is locking in and so is

on your Jimmy you need to put it in 4 hi and up under the battery tray is the actuator for the front dif. make sure the vac hose going up to it has vacuum. if it doesn't then start tracking the hoses going down to the transfer case. one goes to the actuator, one to the vents on the transfer case and transmission and one goes back up to the vacuum canister, it's located on the hood on the drivers side. if the canister isn't getting vacuum then nothing is going to work. i just had to repair the hoses in the truck i put the trans in. the 4 wheel drive now works in it. i would have never know this, the hoses drop over by the exhaust and get hot and burnt and start cracking and breaking up and leaking. this can also cause some minor running problems. also. one last note. where the hoses attach on the transfer case. that connector has to go on correctly. it has a pin hole in it to line up on. if you put in on wrong things won't work.

SOURCE: On my 2000 gmc z71 does it have a vaccum solenoid or a actuator switch on the front differential to engage the 4wd or does it have both i was told that it didnt have a vaccum

2000 model is vacuum controlled