My 4x4 will not work the thing under the battery sucks back so I don't think I have a air leak but I seen today if I'm in 2 wheel or 4 hi/low it don't matter the frnt drive shaft still turns but the frnt tires don't lock up lol I'm lost any ideas guys ?

 

https://blazerforum.com/forum/tech-a...ill-help-7180/ check this thread out. Might be some useful info in here..