well this might be a stupid question but i have been having a problem on my 2004 f150, my 4x4 will not engage, i know it could be my front hubs or my vaccum seals but i have searched everywhere and can not figure out where to find this seal, is it in the hub its self? the problem with my 4x4 is when i put it in 4H it will engage (i can hear the t-case click) but when i give it gas the front wheels will not turn it will make a loud grinding noise, im assuming it is either my seal or my hub. i checked all the lines and they are all in one piece. so if anyone can point me in the right direction that would be awesome, or if you have a diagram of the hub and seal.

on a side note, also in 2wd the front hubs will make a grinding noise still? whats the deal with that

 

Sounds like your IWE's are shot. Vacuum releases them for 2wd, no vacuum engages them for 4wd.

 

ok so do you think if i just replace my hubs it will work again?

 

https://www.f150online.com/forums/ar...then-some.html

 

thankyou