Ok guys, ive been absent from the board for a while now with other activities, but ive got a few issues that i need to address and request the help of the brotherhood if you can. I will start new threads for each issue, lets start with the 4wd not working.

In the past, ive had the common issues of vacuum leaks causing issues as evident from the defrost/ac and then finding busted vacuum lines. Changed out and everything fine for a few years. Now, i dont have 4wd but i dont have the tell tale vacuum leak signs. Also, even if i manually engage the hubs, still no 4wd.

I try to listen for the transfer case to engage when i switch from 2wd to 4wd, I think I hear it engaging, but to be honest the 7.3 makes so much racket Im not positive that Im hearing it, or at least not hearing it the way I "think" that i heard it in the past. I seem to recall a distinctive clunk when engaging, now its barely audible if at all. Now when I switch to 4-Low, there is the distinctive sound, and it does goes into low drive, just that its only 2wd-low, still no front wheel action.

I have never had any issues before other than the vacuum leaks, have never had reason to dig into the transfer case for any reason. The only time it has ever been touched was last summer when i had the BTS installed and all they did was remove and replace.

Do I finally need to either rebuild or replace my hubs? Is it possible not to have 4wd even with hubs manually engaged? Or is there an issue with the t-case? Or is there something else going on? I have access to a lift to attempt "driving" while all wheels off the ground, its just not mine and its a tight fit and a pain to get my truck on it.

Any thoughts and ideas to point a brother in the right direction are welcome.... tired of getting stuck in my yard on wet grass....

 

Do your 4x4 and Low lights come on in the dash when you flip your switch? If so, check to make sure your front driveshaft is "locked" to the transfer case when you are in 4HI or 4LO. If your lights illuminate but the drive shaft is not "locked" to the transfer case, pull the transfer case shift motor and check to see if the little plastic indent turn tab thing will spin freely. If so, new shift motor time.

Baatzy

 

Yes, the lights work just fine, just no front wheel drive. Its raining at the moment, ill check that when i can.

 

That's good news, that tells us the entire electrical end of your 4x4 is working fine, I'm gonna bet it is your shift motor.

Baatzy

 

The shift motor is located externally of the t-case? Anyone got pics?

 

I don't have pictures, but yep, its located externally, 2 different wire connectors on it, held in by 3 10mm bolts. Pop the wire connectors, remove the bolts, pull the motor out towards the driver side and off it will come.

Baatzy

 

Baby steps.


The truck doesn't have to be running................


KOEO, turn it to 4x4 and see if it shifts thru in both ranges.


If it does, leave it in 4x4 and get under and spin the front drive shaft. If it does, problems in the tx case, no deal and it's locked, problems in the nose.


Denny

 

Ok, apparently I failed to see Denny's last post, havent tried that yet. But I did manage to finally get AE hooked up after its been sitting in the box for quite some time. I got the following codes from the truck regarding the t-case. One can only assume the codes and my issue are related. What are typical causes of these codes? This as done after initial code retrieval, cleared the code list, shut truck off, reconnected and this is what was displayed...