So today I changed out my front diff fluid and it came out milky white wich I'm sure means water has been in ther. I've probly been driving like this for about 20,000 miles now. Sometime during this winter my 4x4 stopped working and I'm thinking its because of this.

Now my question is would this make the diff stop engaging. With fresh fluid in I found a nice field to see if it freed up and it felt like it grabbed for a few seconds but as I slowed down I heard a clicking until I stopped. Then it went away. So after that I dropped my front wheels off a curb and backed up to see if it would push me up it and my back tires just spun.

Any help would be great.

 

Sounds like ur transfer case not ur diff. N yes gear oil n asa matter of fact all oils once they get water in them they turn into a milk shake. Ur diff wouldn't be the problem. Ur transfer case is but if it engaged than let out u might wanna check ur linkage it maybe loose causing it to slip from 4 high to 2high. Have u tried 4low yet? To be sure

 

My dad was looking under the truck as I moved forward in 4hi. He said the front driveline was spinning witch should mean the transfer case is engaging rite

 

Make sure that the front pod is getting vacuum and engaging. They sometimes don't fully engage the fork, causing the clicking you seem to be describing. This is probably what is giving you the problems.

If not, follow the lines up to behind the battery and check the solenoids. If you are getting vacuum, check the transfer case to make sure it is fully engaging. You didn't say if you had the 4x switch or the mechanical lever style of case. The electric motors sometimes don't fully engage, which causes also what you are describing. There are usually very few problems with the mechanical lever types other than the solenoids or front fork not engaging.

 

I do have the manual floor shifter. I checked the soleniods awhile ago and those are good. Could even feel a slight suction on my finger. Wher and how do I check the front pod for vacuum?

Also what oil is used for the transfer case.

 

The transfer case uses Mercon ATF 2 quarts