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-   -   Using jackstands with curved saddles on the frame rails (http://www.jeepforum.com/forum/f13/using-jackstands-curved-saddles-frame-rails-1533242/)

AVR2 06-06-2013 05:06 PM

Using jackstands with curved saddles on the frame rails
 
Okay, so the official information from Chrysler is that jackstands should be placed under the frame rails. That's what I've been doing. Thing is, wherever I look, jackstands always seem to have curved saddles, like these :

http://i96.photobucket.com/albums/l1...psfa5f78bd.jpg

Obviously they're meant to go under axles, so when you put them under the frame rails on a ZJ because you need axle droop, there isn't much of a contact patch and the weight of the vehicle is being concentrated on the tips of the saddle. Supposedly this isn't a problem, and I've never felt any movement when shaking my ZJ after placing the stands but... I always have that slight worry in the back of my mind, simply because the contact patch is so small. And looking at the frame rails, you can see dents where the saddle tips have been.

Is this something else I'm over-thinking?

WhiteOut 06-06-2013 05:08 PM

So long as the frame rail fits inside of the tips, you're fine.

AVR2 06-06-2013 05:13 PM

With my 6-tonners, it doesn't. The frame rail is slightly wider than the tips, so the ZJ is literally sitting *on* the tips.

JeepForever 06-06-2013 05:37 PM

I felt the same way, not liking the small saddles. I bought a bigger set for the frames. You could try one tab outside the frame and the other on an indent on the frame if there is one.

shaban 06-06-2013 06:55 PM

I just put a piece of softwood 2x4 block between stand and the frame rail. Tips jam in the wood nicely and dont scratch the frame.

WhiteOut 06-06-2013 06:56 PM

Quote:

Originally Posted by shaban (Post 15529081)
I just put a piece of softwood 2x4 block between stand and the frame rail. Tips jam in the wood nicely and dont scratch the frame.

Don't do this, soooo unsafe.

5-90 06-06-2013 06:59 PM

If you want more stability, weld a big plate (probably 1/4" or so thick, at least 12" square) to the bottom "foot" of the stand, centered. That will make it MUCH harder to tip!

However, I've been using 2-ton stands for years - sometimes even putting "all four paws in the air," without incident, the saddle on them is about 3" wide. I may eventually make "socket adapters" to go on the ram/saddle to give enough width for the frame rail, but I haven't bothered to design them yet (or get some bar stock and machine out new rams, with wide saddles...)

Virmagicus 06-06-2013 09:48 PM

Quote:

Originally Posted by shaban (Post 15529081)
I just put a piece of softwood 2x4 block between stand and the frame rail. Tips jam in the wood nicely and dont scratch the frame.



You should never block in between the the jack & load.

riot1987 06-06-2013 09:55 PM

I feel the same about using those stands on the unibody. Ive never had issues with them though. Ive been wanting to build some removable "cups" if you will, that slide over the saddles-making them wider- and then can be removed

shaban 06-07-2013 02:24 AM

Err, guys, could any one please explain why using blocks is unsafe? I can understand using a tall block is no good because it can slip sideways or something,
but for a 1-2'' thick board, what can go wrong? And since its some soft pine the jack stand bites half way into it anyway.

cgcarpenter 06-07-2013 03:35 AM

Quote:

Originally Posted by shaban
Err, guys, could any one please explain why using blocks is unsafe? I can understand using a tall block is no good because it can slip sideways or something,
but for a 1-2'' thick board, what can go wrong? And since its some soft pine the jack stand bites half way into it anyway.

Even if its that thin it may snap or slip or break and even if it falls only an inch 4000 pounds can generate a lot of force onto you or the jack or stands its falling onto.

riot1987 06-07-2013 07:15 AM

Quote:

Originally Posted by shaban (Post 15530273)
Err, guys, could any one please explain why using blocks is unsafe? I can understand using a tall block is no good because it can slip sideways or something,
but for a 1-2'' thick board, what can go wrong? And since its some soft pine the jack stand bites half way into it anyway.

It still doesnt grip the "frame rails," the wood could fracture and break, the jeep could crush your body and kill you until you die

Marcos 06-07-2013 07:31 AM

if you use wood (I do sometimes) make sure to orient the grain of the wood so that the curvature of the jack saddle will direct the wood inward and retain it. If you orient it the other way and the wood splits, the block can fall out of place completely

ZJDusik 06-07-2013 07:51 AM

Quote:

Originally Posted by riot1987 (Post 15530671)

kill you until you die

This ^

But I've never had a problem with putting the jackstands under certain parts of the axle, for short periods of time though. As long as you've got a wheel chock and have a slightly loaded jack.

moggie99 06-08-2013 01:41 PM

Just make sure that the Jeep is sitting firmly on on the axle stands before getting underneath. I always try to push it off and if it doesn't fall off then it's safe to get underneath


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