Watch the 1-5-6-4 Soul #1 online guitar lesson by Andrew Ford from Bass Groove Survival Guide
Here are just the 8th notes so you can isolate them and work on getting them to feel right. You can also hear this rhythm in some of Sly Stones music with the great Larry Graham. Listen as I alternate playing the short long funky 8th notes and normal 8th notes. I think you will clearly hear the difference.