If you have an extra bouncy or hard ride*, you need to replace the accumulators.
*I believe this is also an indicator of the condition of your coil springs. If you have an extra bouncy ride with shot accumulators, the springs are doing their job. If you have a hard, jarring ride, the coil springs are worn.
Biodiesel300TD (Andrew) has the o-ring kits for the SLS valve.
