I have no idea what you would actually call them. However I have no lift and it is super cramped under the Mustang while it is on jack stands.

While I am going down the rabbit hole of wanting buying an LS430, putting good brakes, suspension, tires, and straight pipes on it for the family cruiser but actually not doing it. I came across this video where they were using these.

Would anyone take issue working under a vehicle while on these and then putting Jack stands in place as well while not being worked on.
While personally I would add a 3rd or maybe even 4th cross board on the section in contact with the floor.

I haven't, but I would have no problem using those, assuming they are fastened securely.

I'd probably use threaded rod through all four corners of each stack rather than nails. I do tend to over-engineer things tho.

I'd also use a third cross member at floor level.

The additional cross boards on the bottom would make me feel much more at ease under those. I’d probably make them from hardwood also vs white wood at Home Depot.

I’m pretty wary of getting under anything unless it’s on a lift. Known of at least three instances of people having cars fall onto them. One friend, one classmate in HS and one rescue call of a man trapped under a car. The friend survived that one despite a glancing blow from the frame to his head, the other two not as lucky.

Never seen something like that before
Definitely understand limited space. My [soon to be former] Malibu was the same way. Tough to lift it and find somewhere to put a jack stand. Usually had to lift on the control arm pivot, then put the stand on the framerail lift point.

Cribbing, I think is the term used to describe this method of temporary load support.

I would not trust those particular blocks first take a look there should be another 2x4 in the middle on the bottom row. I always use at least two different means of supporting something I’m working under.

Looks like it might add a little excitement and drama to the usual after-dinner family recreation!

Perhaps the reason it doesn't have a center crosspiece on the bottom is to idiot-proof the design.

As presented, the design 'cradles' the tire to a degree, and will do so regardless of the positioning of the stack. Turn it over, and it works equally well.

If one side has that center crosspiece, an inattentive positioning might have the tire sitting on the 3-across end, effectively creating a flat surface. Much easier for the tire to shift/slip off, especially if you were being energetic under the car with a breaker bar and a handle extender...

It’s called “cribbing” it’s used in dry docks, and yeah I’d work under it and not be worried. I’ve been under a 300’ ship just held up by cribbing

How much more room do you need over what your jack stands give you now? For the effort could you just buy a 6x6 post, cut it into pieces and then make solid pads for your jack stands? Could you screw 2-1’ long pieces of a 6x6 together and have your jack stands sit on those? At least that would be solid wood.

I worked as a machinist in a crane yard for a time. We routinely used cribbing to hold unbelievable amounts of weight.

If they're well fastened you'll have nothing to worry about.

quote:

Originally posted by CEShooter:
How much more room do you need over what your jack stands give you now? For the effort could you just buy a 6x6 post, cut it into pieces and then make solid pads for your jack stands? Could you screw 2-1’ long pieces of a 6x6 together and have your jack stands sit on those? At least that would be solid wood.

As much as I can get and this leaves pretty much nothing underneath the car at all.
One of the next jobs is the adjustable transmission crossmember. So I need a Jack under there with me when the cross member is coming out and going back in.
Then need to do some small welds once the cross member is properly in place.

I’d like to be able to weld a set of full length subframe connectors in too. For that the vehicle needs to have it’s full weight in the suspension and flat.

I’d trust that far more than Chinese jack stands from Harbor Freight.

I personally haven't used cribbing but I would think it's the best way for driveway DIY when you need to spend extended time UNDER the middle of the car. As long as the cribbing is done properly using the right materials (whatever that means in term of cribbing materials), hell yea. If it's good for ships and moving buildings, it's good for me and my pickup.

Cribbing is good to go. We used cribbing underneath huge air jacks to jack up locomotives. Cribbing is also used when rerailing both box cars and locomotives.

I have a neighbor that build his own ramps out of 2x4s. Seems solid enough.

I have see it used on Teee Veee! as MikeinNC says you see it under mega ships in Dry Docks.

I wouldn't put 2x4 across the sets, you don't want to accidentally hit it and shift something, or most likely block access/exit points.

Duh fuq would you use something like that if you have a Bendpak? Just questioning the picture, note the OP's question.

quote:

Originally posted by flesheatingvirus:
Duh fuq would you use something like that if you have a Bendpak? Just questioning the picture, note the OP's question.

In the video I pulled that clip from they had just installed ride height adjustable Coilovers and they were doing that to make sure they were at the ride height they wanted.
Little better view at that level.

quote:

Originally posted by MikeinNC:
It’s called “cribbing” it’s used in dry docks, and yeah I’d work under it and not be worried. I’ve been under a 300’ ship just held up by cribbing

And that drydock probably had a rule about walking under suspended loads. I never figured that one out.