Ok. Stupid question 2. What’s the danger of leaving on the jack?
Is it better to jack 1 wheel in the absence of stands? I’ve only ever done 1 corner at a time.
You asked...so here goes!
Use them. You can do it without stands, but if both wheels on one end of the truck, I wouldn’t do it without stands.
Never get under a truck without them (or a wheel...something.
If just swapping a single tire I’ve done it.
-Just always assume the possibility of catastrophic hydrolic failure and don’t crawl under the truck without stands.
-People die. Don’t Roll those dice.
Plus...it both tires are off, it wouldn’t take much side pressure to push the end left or right and then boom.
Jacks stands basically exist because they relieve the jack’s hydrilics from the pressure of your massively heavy rig. Also so that you can put a vehicle entirely on four stands if needed... (fancy way of putting it up on “blocks”).
The other reason is...have you ever tried moving around under a truck with a huge floor jack square in the middle? It’s not only a pain, but it’s also really foolish.
So...jack up as tall as you prefer...extend the jack stand’s post...lower onto jack stands...relieving your jack’s hydrolics down onto them so the stands bear all the weight. If you’re just swapping tires, no reason to remove the jack, but at least take the pressure off of the jack. Then there are no surprises.
Harbor freight has perfectly adequate jack stands for cheap. Grab a set of strong ones and you’re in business.
PS. Another reason for jack stands is...if your jack fails...you won’t be stuck with a truck lying on its belly with two wheel off...and unable to get ANY jack under it to recover. That would truly suck, especially if inside your own garage.
Honestly, jack stands should be standard equipment with floor jacks IMHO.
PPS.
Real life—
—My uncle narrowly escaped almost certain death for breaking the jack stand rule:
-Under his truck...the jack was SLOWLY lowering (leaking fluid). He was grinding away with sparks flying, so was distracted...and luckily he noticed it slowly dropping before he was pinned. Dumb move and he knew it...because he has jack stands, but got in a hurry. He was embarrassed, but alive.
