2.3.1 Spring-over-axle
The Spring-over-axle (SPOA) conversion is by far the most popular due
in no small part to its well-roundedness. SPOAs perform well in any
terrain. By relocating the axles from above to below the leaf springs,
an easy 4.5 inches (or more) of lift can be obtained with minimal cost
and complexity, allowing the use of 32 inch tires. Additionally, this
type of lift yields a substantial increase in articulation, an improved
ride, and very good on-road manners if built properly. The price can
vary a lot, from $250-$700 from a shop, or less than $100 if you build
it yourself. It also allows for future modifications, since lifted springs,
new shackles, and other mods will work well with it. Other components
that will be affected by a SPOA include driveshaft angles and length,
steering geometry, brake line and shock absorber length. Welding the
new spring pads to the axle housings also requires setting proper spring
pad angles and making sure that the welds do not cause any damage.
