someone please tell me that the front diff is activated or engaged through vaccum or something!

i ask this because i engage fourwheel drive and lock the hubs and i get nothing. the front driveshaft spins but nothing goes out of the front diff into the cv shafts...

i recently had to replace my engine so im hoping that something may be unpluged.

 

Yes, the ADD front diff uses 2 vacuum lines to actuate the sleve in the differential...

Make sure you're getting air down there.. heheh

 

o thank god! ok ill be looking for those two tomorrow. can you give me anymore info on these two lines? like where they go and which one plugs into where?

 

Sorry, I can't help you.. They both go to a VSV.. one of many in the 3vze

I just know there are two lines, I came across them when I swapped out my diffs..

 

Yes, I can, I'll go look on my truck after dinner. Hold on there cowboy.

 

4wd info

All you gotta know to diagnose it is right there. Fly at er

 

Yeah that's pretty much it, its right by the fuse box, there's a blueish and a brownish vacuum solenoid, and the have rubber vacuum lines that go down the the diff. Just experiment which goes to which of the two nipples (is that the correct term). There's only two options.