hello,
my 4x4 isnt working... although yest when I got home I went to pull into the fence I was in 4x4 but could tell the front wasnt engaged cuz I kept spinning at lights and stops when I stopped and got out to openthe fence and when I got back in went in reverse a little bit and it thumped and I had 4wd in reverse then I put it in 1st and went forward and no 4wd cuz I ended up spinning .. the shift motor is brand new and I thought I could hear gears touching like it wasnt all the way engaged at the axle..

a week ago i pulled the vacuum lines off the shift motor and heard air but Im going to put a vac test on them, if I have one that works, and check the line also per dodge ram .org im going to try and diagnose the engage problems...

I also am wondering if all this doesnt have something to do with my vacuum pump or lines. because in the 12 valve forum I have had a post about coolant pushing out my overflow and my truck heats up at the temp guage but blows cold air threw the def and heater at low rpms if I keep the rpms at around 1500+ or down the hwy at a consistant rpm of 1500+, the temp guage stays normal with normal fluctuation from 140*-180*- 190*ish and blows warm air like normal for winter. I guess my question would be is the vacuum a possible culprit in these problems with my truck?? and how would I diagnose that? pumps are over $200 for reman. from what I found and it doesn't seem like to bad of a job to do in a couple hours but id hate to replace that expensive part when maybe I could only replace some vac line or fittings and the water pump or clutch fan f or about half the money and same amount of time... any and all advice and input is greatly appreciated THANK YOU

my truck has rust and is 96 2500 4x4 5spd 4:11 gears 244xxx miles with a build date of 9/95 so it was part of the recall of the vac lines but Im not sure if its still elligable or if it was even fixed in the first place I have not owned this truck long.. but it is my ninth cummins I have owned

 

it is the cad unit on the front axle. Search CAD failure and read all about it.

 

the CAD is new (like brand new shiny still just put on a month ago) if thats the round thing that the 2 vac lines are plugged into at the pass side of the front axle. im still wondering if vacuum is my overall prob? maybe blew something that pumps too much air into my cooling/heating system and not enough to engage 4wd..??
how much are the manual kits and how hard are they to install?

 

you can make your own. Search homemade posilock and its the first link. 30 bucks vs 200

 

Look here http://www.jeepforum.com/forum/showthread.php?t=595515

 

A quick fix I had to do this Pull CAD off undo a 3/8 or 5/16 hose clamp Slide fork over to the engage position Put clamp over shaft position it away from fork next to housing Tighten clamp onto shaft Reinstall Cad making sure collar and fork are aligned Get In And GO