C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

jack stands

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Old Jun 8, 2013 | 12:09 AM
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So question: If a vehicle sets on Jack stands for 6 + years does that compromise the frame or body or engine components at all ?
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Old Jun 8, 2013 | 01:44 AM
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Maybe if the floor they are on isn't level, but I think you'd be hard pressed to know. I can't see where it's any different than sitting on the tires for 6 years except on the jack stands the tires wouldn't get flat spots.
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Old Jun 8, 2013 | 03:04 AM
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shouldn't unless the jack stands are in a weak point on the chassis where they aren't recommended to be holding the car.
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Old Jun 8, 2013 | 08:11 AM
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Its going to take a while for the suspension to settle. When you put it back on the ground, its going sit funny.
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Old Jun 8, 2013 | 08:42 AM
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While not a C-4, I had my 76 C-3 on stands for several years in the garage and covered. Upon removal of the cover after a few years, the rear bumper cover had split in one area from top to bottom. Gotta believe it had something to do with the car being on stands.

Last edited by Jud Chapin; Jun 8, 2013 at 02:01 PM.
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Old Jun 8, 2013 | 09:11 AM
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All those plastic bumper covers dry rot and fall apart . Nothing to do with jackstands
Just did a 74
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Old Jun 8, 2013 | 10:41 AM
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For the past 12 years, my car sits on jackstands when it's not at the track. It hasn't broken in two yet!
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Old Jun 8, 2013 | 11:32 AM
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My '86 has spent the at least eight months on stands with no noticeable effects. Suspension fully extends and it does take a mile or two to get back at normal ride height.
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Old Jun 8, 2013 | 02:03 PM
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Originally Posted by Rob31
All those plastic bumper covers dry rot and fall apart . Nothing to do with jackstands
Just did a 74
I don't think I've ever heard of polyurethane dry rotting. Are u sure?
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Old Jun 8, 2013 | 03:04 PM
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Wow !! So Thank You all for the responses. The floor is level as far as I know. Is a rv pad. I have not noticed any cracking anyplace but was just curious how having those jack stands in one place for so much time and the pressure points being there all else is suspended in air would make me concerned. I will watch for the suspension to adjust and see how long it will take. I appreciate all of the input and ideas here. Thank You all very much.
Originally Posted by mcm95403
Maybe if the floor they are on isn't level, but I think you'd be hard pressed to know. I can't see where it's any different than sitting on the tires for 6 years except on the jack stands the tires wouldn't get flat spots.
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Old Jun 8, 2013 | 04:57 PM
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Originally Posted by Jud Chapin
I don't think I've ever heard of polyurethane dry rotting. Are u sure?
I did a 74 conv. a while back . the rear cover became hard & brittle . You could break it apart like stale bread . It happens a lot around here . Id expect its the UV rays that do it .
I replaced it with a flexable glass one .Painted the car
Bodyman for a long time .30 years
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Old Jun 8, 2013 | 08:39 PM
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Originally Posted by Rob31
I did a 74 conv. a while back . the rear cover became hard & brittle . You could break it apart like stale bread . It happens a lot around here . Id expect its the UV rays that do it .
I replaced it with a flexable glass one .Painted the car
Bodyman for a long time .30 years
The bumpers on my 75 fell apart. Nothing to with being up on jackstands though.
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Old Jun 8, 2013 | 08:43 PM
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If the wheels are hanging the shock pistons might get crusty/rusty. Then, when the dirt and rust are forced back into the shock, it will begin to leak. Otherwise I think it would be fine.
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