Lift Measurement?? (1 Viewer)
- Thread starter Nomis
- Start date
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http://www.sor.com/sor/cat288.tam?xax=27271&page.ctx=cat288.tam
Stock shackles for 58-7/80 are 2-3/4" center to center.
A lift shackle is rated in how much more distance is between t hose two points. So a shackle advertised as a 3" lift shackle would be 3" plus the original 2-3/4".
HOWEVER... a 3" lift shackle will not raise your vehicle height up by 3".
One end of the spring is fixed, and the other is hooked up to a shackle. The axle is in the middle. Any increase in shackle length only changes the height at the spring by half that amount. So a 3" lift shackle only increases the vehicle height at the axle by 1.5". A lift shackle of 1.5" only raises vehicle height by 3/4". A 2/5" lift shackle raises vehicle height by 1.25". You can use this information to "fine tune" your ride height.
There is a point of diminishing returns. At some point, too much shackle increase will stop lifting the vehicle, and at some point can reverse arch the springs. A lot of hot rodders jacking up their cars found that out, to their dismay. This usually oinly happens with excessive shackle length, like a 6" or even 8" lift shackle.
Speaking of ride height, I like a little more lift in the rear than in the front. This way I know the rear will never sag when it's loaded up with passengers, cargo or a trailer. The drawback is you may have to readjust the caster angle. Mine is off on my FJ40, and I'm working to correct that.
Stock shackles for 58-7/80 are 2-3/4" center to center.
A lift shackle is rated in how much more distance is between t hose two points. So a shackle advertised as a 3" lift shackle would be 3" plus the original 2-3/4".
HOWEVER... a 3" lift shackle will not raise your vehicle height up by 3".
One end of the spring is fixed, and the other is hooked up to a shackle. The axle is in the middle. Any increase in shackle length only changes the height at the spring by half that amount. So a 3" lift shackle only increases the vehicle height at the axle by 1.5". A lift shackle of 1.5" only raises vehicle height by 3/4". A 2/5" lift shackle raises vehicle height by 1.25". You can use this information to "fine tune" your ride height.
There is a point of diminishing returns. At some point, too much shackle increase will stop lifting the vehicle, and at some point can reverse arch the springs. A lot of hot rodders jacking up their cars found that out, to their dismay. This usually oinly happens with excessive shackle length, like a 6" or even 8" lift shackle.
Speaking of ride height, I like a little more lift in the rear than in the front. This way I know the rear will never sag when it's loaded up with passengers, cargo or a trailer. The drawback is you may have to readjust the caster angle. Mine is off on my FJ40, and I'm working to correct that.
- Thread starter
- #3
So my shackles in the pic are only providing 1.25-1.50" of lift? And if I were to replace them, I would order a 1.5" lift shackle - correct?? Forgive me if you answered that somewhere in your original post Brian. Thanks.
