Hello fellow Jeepsters, I have yet another problem with my 1990 Cherokee. When I am setting in park or neutral and I am pulling the 4x4 lever I feel the transfer case engage but I'm not getting any power to the front wheels. I do have the vacuum setup on my rig still. Can any one start me looking in the right spot in order to get this fixed?
Dose any one have a vacuum wiring diagram for this system? My Chiltons don't .

What good is a 4x4 that is only 2 wheel drive?

 

Get under it and manually shift the linkage.

 

This could be a big part of your problem. Not shifting it the way it was designed to be shifted.

Here's how the factory suggests you shift the transfer case and I've been doing this since these things were new and I worked at the dealership. Quoted from the owner's manual.

"To engage, shift the transfer case lever from 2H to 4H while the vehicle is moving at any legal speed". I let off the gas, throw the lever and then tap the gas and let off.

4L position: " To engage, slow the vehicle to 2-3 MPH , shift the transmission to Neutral, then shift the transfer lever to the right and pull firmly rearward to 4L".

 

Here ya go. Climb under and check out these connections.
http://www.jeepforum.com/forum/f12/w...witch-1247852/

Best bet would be to swap to a one piece shaft.
Like so: http://www.stu-offroad.com/axle/yjd3...jconvert-1.htm


Did you read his post?

 

Yea, it might not be fully engaging. I'm perfectly capable of comprehending simple English, I appreciate the concern though.

It could also be binding.

Shifting on the fly is somewhat idiotic. I wouldn't do it over 10mph.

 

Well, it's what is was designed to do. The quote is from the factory owner's manual. I've been shifting these Jeeps that way since 1984 when they were brand new. Done it at 80 MPH more than once.

 

Think about it, that is X amount of force being applied in a matter of what, less than a second? That's begging for something to get torn apart.

 

There's no force. You're letting OFF the gas. Did you read the instructions?

You really think the guys that designed it and had to back up the warranty claims would write those instructions if it was an issue?
It never was. I spent over 12 years as Service Manager and Shop Foreman of a Jeep dealership with no issues whatsoever shifting these transfer cases the way they were designed to.. .

 

So in drive, at 80mph foot off the gas, your transmission is not spinning at the same speed as if your foot was on the gas going 80mph?

When you engage the T-Case in drive, all the force is going to be sent to the input shaft in the matter of a second, which will then be transmitted to the chain, output shaft, front driveshaft, differential, than wheels. And everything inbetween putting immediate stress on the parts with a significant amount of force.

And my certifications are listed in my signature, the list has grown since I put that there in 2010. But this isn't a dick measuring contest so who cares.

Think before you speak.

 

I'm not speaking. The engineers who designed it are speaking, the same as they did from 1984 through 2001.

This is not a contest. It is statement of fact and experience.

 

 

always the way ive shifted also except the 80 mph part more like 40 to 45 mph
diesel, how are you doing it?

 

Correct. I'm not advocating the 80 MPH shift, just using it as an example. The instructions say "any legal speed".

The most difficulty anyone has shifting from 2H to 4H and back again is when they're stopped.

 

Sorry for the sidetrack. As you can see form the owner's manual, it is best to be moving while shifting. The method of shifting may not be the whole issue though. Try the factory recommended procedure and see if it works.

If not, the vacuum system for engaging the front axle may be compromised. If so, the easiest and simplest solution is to eliminate it so it will be like the 91 and later XJs. I'm providing a link to that 20 minute fix below:

https://www.cherokeeforum.com/f51/fr...ss-91-a-38629/

 

I do this going in and out of 4H but wont that cause the transfer case to grind going to 4L?