Front wheels drag wheel in 4 wheel drive. What's wrong?

 

What do you mean when you say they "drag"? Do you have the same size tires on the front and back?

 

When I say drag I mean the wheels lock. The bac wheels are Pushing the car truck and the two front ones are locked like the e brake is on.

 

Its hard to diag something without being there, but it could be that your planetary gear set in the transfercase isn't engaging all the way or not meshing together when you put it in 4wheel. What year is it? What is it XJ ZJ? What mods if any?

 

It's a 99 grand Cherokee loredo. 6 cyl. No mods.

 

Have either the front or rear axle been replaced?

 

I would suggest you inspect the ring and pinion for anything that could binding it, but I doubt thats it because it rolls in 2WD mode.
I'm thinking that its in the transfer case and the chain is binding/locked up.

But then it turns all the time anyway when driven front wheels.
Hmm, Have you tried it in 4LO?

NO CAD to fungle up, got me stumped I can't think of anything there that could bind/lock up under power, but free spool when not.

 

x2. Could be different gear ratios, keep in mind unless you've owned it since it was new you never know what the p.o. did.

 

x2 I was honestly hoping for it to be like a 89 XJ

 

What kind of surface are you on? You do know not to engage a part time 4x4 on pavement right? Many people have no experience with 4x4s and think they are the same thing a AWD cars and can be ran in 4x4 anywhere.

 

Thought about this and I'm going to ask the same question......
Jack up the front end.
Put a chalk mark on the tire and grab the drive shaft and rotate the tire one full turn, counting the turns of the yoke.
Repeat for the rear they should equal.
Easier than pulling covers and counting gears and will give you a close enough estimate to know if the ratios are the same.