Hey everyone, I’ve been having issues with the 4x4 on my 07 2500. The front axles locks up suddenly while driving in 4x4 skidding the tires. I can reverse just fine but as soon as I move forward the wheels lock up again in both 2WD and 4WD. I removed the front drive shaft and was able to drive home without issue. If I jack up the front axle I can spin both sides freely as we as spin the pinion in both directions. Any ideas on where to start? Thanks in advance.

 

Some recent history: It has done this a week before. I had the truck towed found that the outer pinion bearing was shot so I did a bearing and seal rebuild. I replaced the gear seat as well. Then during my first test drive is when the events in the first post happened

 

Is it the axle or the t-case that is locking up? If it was the axle, I would think pulling the front shaft wouldn't matter.....

 

I’m thinking it is the T case just not sure if this would be caused by the shift motor or the internals of the t case

 

Trying to shift into some variety of 4x4 on a high traction surface can indeed cause some interesting behavior. Unfortunately, that is something the electronic shift T-case does as one of its failure modes...... Figuring out if it is the the switch, controller, or shift motor is the fun part.