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So I help two chicks change a tire......(Potential Problem)

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exdeath said:
We aren't talking about on a lift on even concrete with a someone holding the free wheel. We are talking about 4000 lbs lifted up on a spare jack on a slope with only one of the drive wheels on the ground, and the rake of the car rolls foward on that one wheel and slips off the jack with nothing locking that wheel but the rotational inertia of the opposing wheel in the air. There is nobody holding the other wheel with a prybar then.

Still this thread is amusing. All this fuss and detailed scenarios and technicalities but people have been changing tires on the side of the road for 100 years without much drama 🙂
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True....and most of them remove the lug nuts after the tire's in the air, with no problems.

No..you're right, nobody's holding the free wheel on the side of the road....the weight of the car IS. That's why you can't turn it.

Now, in the OP's case, it seems the car simply fell off the jack....probably was either on uneven ground, or just not put under there correctly/securely.
 
Pacfanweb said:
True....and most of them remove the lug nuts after the tire's in the air, with no problems.

No..you're right, nobody's holding the free wheel on the side of the road....the weight of the car IS. That's why you can't turn it.

Now, in the OP's case, it seems the car simply fell off the jack....probably was either on uneven ground, or just not put under there correctly/securely.
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*You* can't turn the wheel in the air, no. But like you said, the mechanical advantage is with the wheel still on the ground with the weight of the vehicle. If the vehicle wants to start rolling on the wheel still on the ground it's going to, at least until the other wheel comes down and causes the carrier to attempt to move forward against the park pawl and halting differential action and locking the wheels.

We are talking about the exact same thing, just in reverse, so it sounds like we are aruging 😛

Try this: put auto (not lsd not 4x4) car on slope, park only, not parking brake, lift one drive wheel off the ground if you can while keeping it still. If that doesn't do it, casually lean on the bumper on the high side of the slope. It will roll, slip off the jack, then leave skid marks and stop as soon as the the other wheel comes down, and you'll hear the familar clack sound of a vehicle stopping on the park pawl.

The whole moral of the last couple pages: don't rely on "P" alone to keep the car from rolling when on a jack.
 
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^
1. Have to be a pretty good slope.
2. Have to be crazy to jack any vehicle up on a slope without the e-brake and maybe something under the front wheel.
3. I was talking flat ground, since nothing the OP said indicated anything different.
4. We are WAY off on a tangent
 
exdeath said:
Why? Precisely.
I'd say "why" to me is because if you jack it too high to the point that the other tire isn't touching the ground enough (reduced friction/traction) it might move then...fronts roll, rear slides, falls off jack.



Yeah, 2 chicks in peril, man to the rescue, real question should be why OP didn't PIIHB.
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Took me a minute, I think I got that one. lol
 
You guys suck at teh internets. You're not suppose to be agreeing with each other after all that! Where's the trash talking? Where's the personal attacks??!
 
IcePickFreak said:
You guys suck at teh internets. You're not suppose to be agreeing with each other after all that! Where's the trash talking? Where's the personal attacks??!
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Wherever Fleabag is posting

I've seen enough to of Ex's posts to know he knows what he's talking about....we were simply coming at this topic from a different (and wildly off topic) angle.

I'm not here to blow people up.....although I will when it's someone like a Fleabag who doesn't know anything other than what Google tells him, but acts like he does.
 
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