Cradle drop kits are designed to use the factory geometry upper control arms. Most cradle drop kits are 4" or more.
The JBA lifted upper control arms are designed for a spring lift or leveling kit. If your vehicle has a cradle drop lift, cross-member drop, or drop bracket lift kit. It was designed to work with the factory geometry arms.
Some kits have a 4" cradle drop bracket and a 2" spring lift = 6" lift kit this configuration needs the JBA lifted arms.
How to tell what JBA upper control arms are needed?
- You need to know the factory ride height, the center of the wheel to the fender flare [Example 22"]
- You need to measure the cradle drop offset, center of the bolt head to the center of the bolt head [Example 5"]
- You need to measure the center of the wheel to the underside of the fender flare [Example 30"]
Factory ride height 22" center of wheel to fender
2.0” leveling kit = 24” center of wheel to fender, 24 - 22 = 2
4.0” cradle drop = 26” center of wheel to fender, 26 - 22 = 4
5.0” cradle drop = 27” center of wheel to fender, 27 - 22 = 5
6.0” cradle drop = 28” center of wheel to fender, 28 - 22 = 6
Cradle drop and spring lift combined need the JBA-Lifted arms
4.0” cradle drop 2.0 spring lift = 28” center of wheel to fender, 28 - 22 = 6 - 4 = 2
6.0” cradle drop 2.0 spring lift = 30” center of wheel to fender, 30 - 22 = 8 - 6 = 2
The formula for calculating spring lift or leveling kit lift height.
(measurement from the center of wheel to fender) - (Factory ride height) = (lift kit height)
The formula for calculating cradle drop kit lift height.
(measurement from the center of wheel to fender) - (Factory ride height) - (cradle drop offset) = 0 use JBA Stock geometry arms
The formula for calculating cradle drop plus spring lift height.
(measurement from the center of wheel to fender) - (Factory ride height) - (cradle drop offset) = (a number greater than 0) like 2 use JBA Lifted control arms