4x4 disengage?
 

Hey, my first post here, but definately not my first visit. I have a 05 F350 with the 6.oL, and the intercooler blew up. I caught it just as it started to blow white smoke, and didd the EGR Delete kit on it, wow what a difference. Paying $200 to delete the egr and cooler what money well spent.

However, my problem this time is the transfer case will throw the handle back into 2wd. Has anyone else seen this happen? Also, since I'm not the only one driving it, I'm told the hub on one side will disengage when going into reverse, then back into drive. It's a plow truck in the winter, and need to get it back up to par soon....

Thanks a ton, this site is the sht!!
:jump:

try to adjust the linkage if the problem happens then you have a problem with the synchro gear inside the transfer case.

I agree with gardeeno, I had an NP208 with linkage that wasn't adjusted properly after a body lift, slipped out of 4HI, but held 4LO fine.

If the hub is disengaging in reverse it could be a vacuum issue. Dry rotted line perhaps. However, if the hubs are manually locked (my preferred setting) when this happens, something could be binding. Pinch the two pieces of that coat hanger looking clip together, pull out the hub and inspect it, you may need new ones. It's not going to just fall out, so don't be alarmed if it takes a little work to get it out. Hubs are designed to be the weak link, thus making them expendable.

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Unless you are locked up/welded up front, how would you know one hub is unlocking? Well, short of hearing a thunk, which usually indicates a problem anyway. Its an open diff, maybe "that" tire not spining in the snow in reverse is BECAUSE its in reverse.

Ever have someone hold their phone over their running car and ask if it sounded weird? :tttt:

Okay, I'll check the linkage... Never thought about this, it's bone sock aside from the egr delete.

I know that the hub is coming unlocked because the guys that use the truck always manually lock the hubs, and they have to go out and relock the hub after going in reverse. This just started happening after they got it stuck in a pond about a month ago. They were trying to pull out a tractor, and got them both stuck. I went out there and got the truck unstuck, then chained both trucks together to get the tractor out.

But after rereading my post, it looks like I meant that it locks and unlocks itself. That isn't the case. If the truck is driving forward, it stays locked. But if they go in reverse, it unlocks until they lock it back in again. Going from forward to reverse unlocks the hub.

I'll pull it and see if I can determine if something is wrong. I assume it's going to be similar to my other trucks (we have an 01, 02, and (2) 03's, and they are all 250's) but the hubs on the 05 are a different style. I am pretty knowledgeable about hubs and all the parts in between. I just thought maybe someone knew something right off the bat.

Thanks for the replies, I appreciate it!!!:c:

Sorry, this is bugging me. If your intercooler "blew up" which I doubt it did, you wouldn't be getting white smoke. Did you mean EGR cooler?

Yes, egr cooler. Good catch, my bad on words. See the sig? It says newbie!!!:tttt:

:c:

Okay, today I finally was able to get some 1 on 1 time with the truck, and found that the 4x4 shifter (manual lever shifter) has a rubber bushing with a plastic sleeve on it, and the bolt that holds it all together was a bit rusty between the bolt and plastic sleeve. Sooooo...the bushing was acting like a rubber band throwing it back into 4HI.

After removing the bolt (with some grunting and so forth :w2: ), I was able to remove it, clean it up, throw some hi temp grease in it, and then it slid in and out like no ones business. I put it all back together and that took care of it.

Again, thanks for all the suggestions, you were right about the linkage... just needed some TLC. Maybe when I have nothing else to do (HAHAHAHA!!!!) I'll drill through it and put a grease fitting on it...

Have a good holiday!