4x4 wont disengage

[doug young]

boyz nees a little help. my 4x4 wont disengage when i turn the dash board switch from 4hi to 2hi. in order for it to disengage i have to slow way down and or stop for it to do so. wat up wit dat?

99 f250. 132,000 miles

doug

 

[tpicou96]

We have this problem on the trucks at work.The problem is with the electronic actuator,it is not strong enough to disengage the transfer case.The pressure on the drive train between the front and rear has to equallize,so the actuator can disengage it.4 lo is realy hard.I have had to ease forward about 1 or 2 miles pr hr and slam on the brakes and throw the trans in neutral.It usually pops right out.Personaly I prefer the good ole lever.

 

[93turbo_animal]

yep its the preasure from binding even with a lever case sometimes it will shift out easy and other times its harder to shift

 

[doug young]

so how do i fix it?

 

[Tbar]

Put it in reverse and back up................


Tbar

 

[Tail_Gunner]

Check the rolling diameter of your tires to ensure front & rear are the same. A lot of folks will blindly put the same pressure in front and rear. Seldom are the front & rear axle weights the same. So either the front or rear tires will be compressed more, changing the rolling diameter and causing front to rear driveline binding.

What I do is measure the distance between the edge of the rim and the concrete garage floor on all four tires. Then adjust the pressure in all the tires (maintaining an adequate amount in each) to where all the rim to floor distances are the same. This will equalize the rolling diameter and minimize front to rear driveline binding.

 

[doug young]

i have rear suspension airbags and i have them pretty full with air, wich as we all know jacks up the rear end. could this be causing the binding?

doug

 

[Tail_Gunner]

i have rear suspension airbags and i have them pretty full with air, wich as we all know jacks up the rear end. could this be causing the binding?

doug

No

It doesn't make any difference how high your rear bumper is in the air.

You have to get all the tires the same size around. Other wise it's like running a 16" tire on the back and 15" on the front or visa versa.

 

[JLDickmon]

Kent is 100% correct..

first thing, check the rolling diameter of the tires.

then check the transmission range switch (we used to call it a neutral safety switch)

they're common to fail