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Topic Review (Newest First)
11-28-2011 06:45 AM
trees Jack extenders have been around for a long time. What have I (we( been missing all these years? Sort of apples and oranges, but I have three different height extenders for the trolly lift on my four post lift and think nothing about using them. I think twice before using a 4X4 block on my floor jack to get more lift height, but do it on occasion with caution. I would feel a bit more at ease using the pictured extenders than using a block of wood.

Trees
11-27-2011 08:38 PM
sweet willy IMHO, you'd have to be very, very, very mad at yourself to use those extenders.
11-27-2011 09:50 AM
matt167 yea, those are an accident waiting to happen, block of wood or wood under the jack is a better idea.. However, if the jack is a small 1.5 or 2 ton you get from Walmart, than it is too small. You need at least 23" of lift in front of the rear tire on the low part of the frame, and a lot of 3 tons go to 27". I'v also lifted on the leaf spring plate to put a jack stand under the frame
11-27-2011 06:20 AM
lakeroadster
Quote:
Originally Posted by keen
They're not significantly different than the way many 2 post lifts are setup for truck adapters, which are also perfectly safe when used as designed.
Keen you make a lot of good points, the one comparing the floor jack extensions to a 2 post lift isn't one of them. A 2 post lift (I have one) has heavy structural arms that attach to the columns of the lift. The arms won't roll over like the floor jack will. And on a 4 post lift you have 4 points of contact for stability. Big difference, huge difference.
11-27-2011 05:48 AM
twlinks Yeah, not to be gory here, but we recently had a 74 year old man crushed under his car in the driveway...he was the retired "HEAD OF SHOP MAINTENANCE" for the city we live in. It's not worth it, even for a second.
11-22-2011 10:11 PM
keen
Quote:
Originally Posted by Dave57210
The more important Q; What the heck are you doing that requires you lift it so high? Please say U R not going under there while its on a jack!
Define "so high" ? A typical floor jack tops out at 19" high. If you're lucky maybe 23".

I dunno about you, but that won't touch the frame on my stock height 2wd 2nd gen dodge.

One would assume that he'd use jack stands (which are readily available in heights over 19"..), but he has to pick the truck up somehow to get it -on- stands. (and no, lifting by the diff housing is both not good and not always an option for the work that needs to be done)


Now, to the OP's question - I don't agree with the rest. 5" of extra height (dont stack them!) isn't going to kill anyone. If not a single one of the naysayers on this thread have never put a stack of 2x4 or 4x6 on top of a floor jack, well, I'll eat my Tilley. Of course you wouldn't get -under- the truck while it's supported that way.

It's not the way I'd do it - but I've been working on cars that need high lift jacks pretty much as long as I've worked on cars. I'd normally say "head down to harbor freight, by their 2 ton high lift long frame jack. $150-200, 30+ lift." - except it's gone from the website now, so they may have finally stopped carrying them. I've worn out 2, and am my third (in 15 years). Might be worth checking if your local store still has some in stock, they'll know what it is (because they are like 4 feet long).

There are some other "quality" jack options, but they tend to cost significantly more $$. If a $500-1000 jack is an option, let me know and I'll dig up my notes.

If it's just occasional use, though, I'd say just buy the extension and take due precautions. They're not significantly different than the way many 2 post lifts are setup for truck adapters, which are also perfectly safe when used as designed. Sure, the arm chair mechanical engineer in me wants to go on and on about the side loading blah blah blah. But in reality, if it -does- fail (and you are lifting safely), worst that will happen is the truck falls straight down, on it's wheels. Hell, that's what happens if the hydraulics blow out in your jack while you're lifting, too. Maybe the jack will kick out a bit, with small but not insignificant force.
11-22-2011 12:52 AM
Dave57210
jack height

OR...... (Do NOT do this - its too simple and therefore dangerous!) - you could put a THICK pad of plywood UNDER the floor jack to increase its overall height. Make sure U use hardwood plywood so wheels don't cause dents which, in turn, cause instability. Maybe some ply with a sheet of steel on top of it?

The more important Q; What the heck are you doing that requires you lift it so high? Please say U R not going under there while its on a jack!
11-21-2011 05:59 PM
Cape Cod Bob Here's an idea that was presented to me years ago. Work some overtime and hire some one to do the work.
I hate working on daily drivers.
I did almost all my own repairs myself and would get so mad when laying on the cold ground fixing something cause I was to cheap to have it done.
Much rather work on my SR. just my opinion.
PS To many guys get killed with cars falling on them and I have taken chances back in the day. It ain't worth it. Leaving your wife a widow. Or worse, taking care of a cripple the rest of her life just to save a couple bucks.
11-21-2011 05:52 PM
PatM Does this company have LOTS of insurance? Your beneficiary could be very, very wealthy. I can't remember the last time I saw something so frightening.
11-20-2011 07:58 AM
dinger Stick with a block of wood. Those look like an accident waiting for a place to happen.
11-20-2011 05:58 AM
TroyBoy I agree! That is pretty scary looking
11-17-2011 07:00 PM
lakeroadster A simply terrible idea IMO, due to stability.

Buy a jack with more lifting height capacity.
11-17-2011 06:53 PM
needforspeed
Car Lift Question

My floor jack won’t get high enough to lift my wife’s Tahoe.
I was going to use a block of wood but then I found these jack extenders in a google search.

Looks like a great idea. Anybody tried these?
http://www.autobodytoolmart.com/cham...s-p-11539.aspx

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