4wd does not work?? help
 

hey everyone today i lifted my buddies truck, and got all 4 wheels off the ground. in 2wd got got a vacuum to the IWE actuators, then we engaged the 4wd and only the rear tires move.. we already replaced the actuator/switch on the firewall... any sugguestions?? thanks!

Check your air lines to the front hubs...

i have a vacuum to the hubs,while in 2wd.. and i lose the suction when placed in 4wd.

Brake booster could b going out that's where the suction comes from and the 4x4 vacuum line is farthest away and it could not have enough to put it in 4x4

That's how it works...you may have a bad hub...

T-case shifter failure maybe?

Even if both hubs had failed, the CVs should be rotating in 4wd.

Yeah...Gator is right...

Does the 4hi light in the cluster come on and stay on solid (not flashing)? If it's flashing, how many pulses?

thanks for the feedback! the CV's rotate and i only get suction on the larger hose going to the IWE hub and the 4hi stay on with no flashing

With the truck off and the front end jacked up, when you rotate the front wheels does each CV rotate? Did both CVs rotate with the truck in 4wd in the air, or just one?