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Apparently no one knows how replacement coil overs work or listens to the guys running them longer then their trucks have been around. So here it is so hopefully you will all understand how it works.
Lift 1
OEM strut and spacer Spacer is placed on top of the OEM strut to gain lift. resulting combo is 3 inches or so longer then the OEM strut alone. The factory spring compresses at the same rate with the weight of the truck the spacer just moves it down. Because the spacer strut combo is longer then the strut it self the LCA and UCA are now extended as if the truck was at full droop. This results in the UCA contacting the coil bucket during down travel because the shock still has its normal range of motion. All a spacer lift dose is move the shock down. It will still unload at the same distance it would stock but its now 3 inches lower THIS IS WHATS CAUSES COIL BUCKET CONTACT
Lift 2
Coil over replacement. Coil over new shock body and stiffer spring rate to gain lift. The combo is normally only an inch or so longer then the OEM strut out of the truck. Lift is gained by the slightly longer body ALONG WITH STIFFER SPRING RATE This is the part that is lost on most people. because the spring compresses less under load the LCA and UCAs relative position dose not change as drastically as with a 3in spacer. This results in a much lower chance of coil bucket contact under normal driving as the coil over has more down travel before the UCA will contact the coil bucket.
I hope this clears it up for some.
Lift 1
OEM strut and spacer Spacer is placed on top of the OEM strut to gain lift. resulting combo is 3 inches or so longer then the OEM strut alone. The factory spring compresses at the same rate with the weight of the truck the spacer just moves it down. Because the spacer strut combo is longer then the strut it self the LCA and UCA are now extended as if the truck was at full droop. This results in the UCA contacting the coil bucket during down travel because the shock still has its normal range of motion. All a spacer lift dose is move the shock down. It will still unload at the same distance it would stock but its now 3 inches lower THIS IS WHATS CAUSES COIL BUCKET CONTACT
Lift 2
Coil over replacement. Coil over new shock body and stiffer spring rate to gain lift. The combo is normally only an inch or so longer then the OEM strut out of the truck. Lift is gained by the slightly longer body ALONG WITH STIFFER SPRING RATE This is the part that is lost on most people. because the spring compresses less under load the LCA and UCAs relative position dose not change as drastically as with a 3in spacer. This results in a much lower chance of coil bucket contact under normal driving as the coil over has more down travel before the UCA will contact the coil bucket.
I hope this clears it up for some.