What do the Pro Shock Numbers mean?

The first letter or combination of letters signifies the body type
A = Aluminum large smooth body
AC = Aluminum large threaded body
ASB = Aluminum threaded small body
SBA = Aluminum smooth small body

The first digit is the shock stroke.
In the example shock the stroke is 8”

The second digit is the shocks compression valve code
In the example shock the compression code is 5

The third digit or third and fourth digit is the shocks rebound valve code.
In the example shock the rebound code is 6.

The letter B at the end of the part number signifies that the shock includes
bearing mounts or ends.

Shock Stroke- The shock stroke is the amount of travel that the shock piston
has. How far the shaft will move from full extension to full rebound.

Compression Valving-Determines how much force it takes to compress the shock. The higher the valve number the more force it will take to compress the shock.

Rebound Valving- Determines how much force it takes to extend the shock.
The higher the number the slower the shock will extend.