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shoal1
owensville, MO
Online Member
Posted - 22 September 2013 20:55  Show Profile  Email Poster  Edit or Delete Message  GoTo Member Rides
look at a 87 yj with a spring over lift never had one what are the pros. and cons. in one
Kooter
Maryland Heights, MO
Online Member
Posted - 22 September 2013 21:12  Show Profile  Email Poster  Edit or Delete Message  GoTo Member Rides
Pros:
Better ride
Cheap lift
Upgradable
Great flex

Cons:
Steering upgrade needed at some point
Stock springs will wear faster without aal's
SYE needed if not already done

Bounty Hunter

Honorary Lifetime,
Online Member
Posted - 23 September 2013 0:10  Show Profile  Email Poster  Edit or Delete Message  GoTo Member Rides
I would argue that a 4" SUA could be done cheaper and easier than a correctly installed SOA lift.
chrispy
, CO
Online Member
Posted - 23 September 2013 6:29  Show Profile  Email Poster  Edit or Delete Message  GoTo Member Rides
kooter and bounty are both right, to some degree.

but since the spring over is already on the jeep, the price is moot.

facts: flat springs flex more than arched springs. this is basic physics. all things being equal, i.e. a 4-5" lift, a spring over with flat springs will outperform a SUA with arched springs. that said, many companys offer very good springpacks these days, so its no longer an absolute that spring over is better than spring under, like it was 10-15 years ago.

Bounty is correct, doing it right, an SUA will be cheaper than an SOA, and the average guy with a set of handtools can install a SUA, while a SOA will require spring perches and steering mods. problem tho, is that many of the cheaper SUA kits use very stiff springs to get lift, so you end up with a harsh ride, and very little spring flex.. all the flex comes from the shackles moving fore and aft, and no the springs themselves flexing... so one could argue that installing a "cheap" or "basic" 4" SUA kit isnt 'doing it right' either.

sorry.. sidetracked...what you have to look for on an existing SOA is if it is done right or not.

- Steering: does it bind/rub anywhere? is the steering box still mounted correctly? does the frame / brackets have cracks where the box mounts? is the drag link basically parallel to the track bar, if the track bar still exists? are the steering links suitably beefy?

- suspension: how did they correct the geometry? pinion angle correct? condition/type of leaf springs? condition/type of bushings? spring mounts,especially the front shackle hanger still solid, and attached to the frame? spring perches welded correctly? is some type of anti-wrap device properly utilized? is there an SYE installed? if not, are there driveshaft vibrations?

ultimately, a spring over shouldnt change the dynamics of the vehicle much, beyond a better ride, and higher center of gavity. if it does, then its probably not installed/designed correctly.

assuming a SOA is installed properly, it will outperform a SUA on, or off, road, every time...but doing an SOA correctly requires the installer overcome some pretty serious hurdles.

Edited by - chrispy on 9/23/2013 6:32:08 AM

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