[jeepnxj96]

My dad has an 06 f-150 4x4 with the electric shift transfercase. it is a 5.4 triton and an auto tranny, now the question is when I try to engage the 4 wheel drive all I get when I get on the gas is a whirling sound?? best way to describe it I guess, not a grinding noise or a clunk just sounds more like metal on metal sound but not scraping sound,at any rate the front wheels have no power going to them but I am sure the transfercase is engaged. Any I ideas as to a cause and solution???? there are no noises from the front end in 2 wheel drive.

 

[booblinker]

Is The driveshaft, or CV shafts spinning?

 

[jeepnxj96]

I am pretty sure the driveshaft is spinning because the noise is from the front diff and not the transfercase.

 

[booblinker]

If the drive shaft is spinning, and the cv shafts are not then either you have a blown front diff, or there is something that kicks the front diff in, im not sure how those ones work.

 

[jeepnxj96]

that is what i narrowed it down to as well so hopefully I can get it figured out soon.

 

[Bishop]

i remember hearing something about having auto hubs in the front of these fords, they were electronic or magnetic or something. that's all i know if that helps

 

[frdboy]

You need to have someone sit in the truck an move it so you can see what is spinning.

If the front driveshaft is spinning it could be a hub issue. The hubs use vac. to disengage them, when no vac. is applied they lock to the cv shafts.

Get the front off the ground and spin the tires by hand, you should be able to see if the hubs are locked or not.

 

[xj97sport]

ya the hubs on those suck i did a wheel bearing on one last week (first time looking at the design) it has a vacuum connect to each hub on the back side of the vacuum plate ... check there they tend to pop off easy

 

[jeepnxj96]

thanks for the info guys i will check it out