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Showing results for tags '4lo'.
I put the truck in neutral, like you should, i bring the truck to a stop, and i push the 4lo button. It flashes for about 5-10 secs but then goes right back to 2hi, I've tried rolling about 2-3mph and it still won't even engage. Its a 2002 chevy avalanche z71, with the 5.3L V8. Sometimes when i press it, it engages no problem, but other times, it just flashes and goes right back to 2hi. When i press 4hi, it goes right in, but 4lo is giving me some problems.
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.