Blisten 5100 front leveling shocks

Do the blisten 5100 leveling shocks really raise the front end without the help of anything else, and is it permanent or does over time they begin to slip and need to be replaced or adjusted?

 

You'll get more responses posting generic questions like this in the Suspension forum instead of a vendor-specific one.

Consider this image to understand how and what they do. Every strut has a spring perch the coil spring sits on. It's what supports the bottom of the coil, so if you raise the spring perch, the coil tries to rise up but gets compressed instead and the truck is lifted because the spring wants to expand. The 5100 has multiple spring perches.



The spring perch is necessarily permanently positioned by you, the installer, by moving the circlip that supports the perch to one of the available positions during assembly. Because of this, the truck can't sag for that reason.

The truck will sag if/when the spring compresses further, either due to added weight or the coil spring's age. You could potentially overcome this later by dissembling everything and moving the spring perch up a notch or two, however the more you compress a coil spring the higher it's effective spring rate becomes, and the ride becomes more harsh.

So raising the truck with just 5100s also has the effect of firming up the ride, as if you installed stiffer springs. This is especially true at the higher perch positions. But know there is no "free lunch" here. The reason why some coil springs are LONGER than stock is not just to increase ride height but also to increase "droop" or downward travel. In other words a coil spring that's seriously compressed/shortened can't do much else but sit at the static ride height all the time. If the coil can't expand back, the wheel can't drop down. As you may infer, this is a big deal when offroading.