Stealership ?'s please help ASAP

[Hummer Guy]

Originally Posted by hummer74

well, i used it in the icestorm in dallas on friday, when i got to work i took it out of 4hi-lock, or so i thought, it stayed in 4hi-lock until i got home. no it didnt smell anything. i noticed it didnt shift out of 4hi-lock immediately leaving work. after i got home, i decided to take it to the dealership because this had never happened before. i backed out of my driveway, then put it in drive and drove off. thats when i noticed it was in regular 4hi. drove to the dealership, and just before i pulled in, i put it in 4hi-lock and then tried to take it out again, just to see if it was still doing it. sure enough, it wouldn't come out of 4hi-lock. i guess im just sort of confused, ive used 4 hi lock before and it had never done this. now it does. i just figured something was wrong because it had never done it before. the manual does say that you may have to back up 25 feet to disengage, i just found it odd that all of a sudden my truck is now requiring it.

I'm not sure how far north you were during the 'ice storm' but a lot of it was just a light coating of snow. As long as you have substantial traction, 4 high open is just fine. In all honesty, 4 high can get you 95% 4 high lock will get you...I always caution folks about 4 high lock because their salesperson may say "just throw it on if its snowing or raining...it gives you more traction"...but when you have traction, that can really mess up your transfer case...who knows if there's anything wrong...I asked about the smell because sometimes you get a slight burning smell when the transfer case/4wd system is under a lot of stress. If i had to guess -- it would be that the 4 high lock system was over-run in the recent weather, and now exhibits behavior of older 4wd systems...I'm not exactly sure on the exact mechanics, others here are...I just know that i've seen MANY 4wd systems need to go in reverse to un-engage, but not H2s...