i have a 2003 F-150 5.4 motor 4WD not engageing all the vacume parts do what they are suppost to do. well ford wants about 450.00 bucks to put an updated parts kit in the front differential my question is has anyone bought the parts kit (140.00) and done the insall themselves and if so how hard was it?

 

not sure if ford and gmc and alike, but i had a 4x4 sierra that did the same thing and they told me the same thing that i needed a updatedpart....wells it turned out to be the 4wheel drive acuatorlike 60 buck and 5 min install.. ask them what is is actually called and then call a parts store and see what they can get it for, like i said not sure how similar the 4wheel drives are in them to but worth looking into....

 

I was having alot of problems with my 98. 4WD wouldn't engage. Had the vacuum lines replaced and it worked better but still had problems with it not engaging.
I had it back to the dealer and found the Front Axel Engage Solenoid was bad. I had it replaced at a cost of $150. It works great now!

That may be your problem.

 

Well took the big plung and tore it apart yesterday and sure enough the shift fork was bad.140.00 in parts and now it works like a champ again! not to hard to do either i never even cussed one time. even changed the fuel filter while i was under it. now for the brakes!
Later Guys