Search the Community
Showing results for tags '4hi'.
Found 4 results
Issue with 4x4
Jomar posted a topic in 1999-2013 Silverado & Sierra 1500My Silverado is having issues with the 4x4. It does Engage but it struggles. When I set the 4h it kinds of drags like something is holding it back and it makes a weird sound coming from the front end. If I set it to 4l it really doesn’t want to move. I have to give it a nice amount of gas for it to go but is feels like something is holding the truck from moving. I’m looking for ideas to pin point the issue. Thank you
99 Gmc sierra 1500 stuck in 4hi
jonahg posted a question in Ask the GM TechnicianI have a 99 gmc sierra that I just bought. While im driving down the road I noticed a whine in the drivetrain, I noticed that the 4wd switch wasnt lighting up so I checked the fuses and the ATC fuse had been removed. I put in the correct fuse and the 4wd switch came on. Once it came on it said the truck was in 4hi. I tried to switch it into 2hi and theres a whining noise coming from the transfer case. It makes 2 long whining noises and the 2hi light flashes the it goes right back to 4hi. I cant get it to change into any other mode (4lo, auto4, 2hi). I bought the truck a week ago and im scared im going to grenade the transfer case by driving it like this. Can you please point me in the right direction.
This truck is my first 4WD/4x4. So a few weeks ago, I put my truck in 4HI, to drive in the snow, no issues. Put it back into 2WD, when I got home, and haven't needed it since, until this afternoon. When I put it in 4HI, it was grind/vibration central, but when I put it back in 4AUTO or 2WD, there is no issues.
Ok, so this is my first time posting here, and I'm really hoping to get some useful feedback as y'all are truck people like myself. I've owned my truck for the past year and a half, and only began noticing this issue after I serviced and changed all my oils (Transmission, and both diffs.) We're talking about a 2014 GMC Sierra 1500, 5.3l V8, SLT trim (if the trim matters). Here's what happens. On 2HI it runs great, no sound, smooth as silk, and transmission temp hovers at around 91 Celsius (195 Fahrenheit), and when I use to shift it to 4HI or 4LO, it rises up to MAX. 105 Celsius (around 220 Fahrenheit), and still smooth on the turning. Once I changed all my oils, suddenly there is a LOUD whining sound coming from beneath once I turn (not even sharp turns), its really sluggish, and the transmission does not take long to reach temperatures of 120-125 celcius (245-260 fahrenheit). I've already rechecked all the oils, and everything is clean and at a good level, there are no leaks, and I've used oils as per the owners manual. Any idea what I'm looking at, or what I should be checking? I do not want to blow useless money on monkeys clanking around in my truck for no reason.