So far this is the mod that made the biggest difference. The increase at the rear wheels is icredible. It's like someone let off the emergancy brake.
You can see how much smaller the high performance pulley is compared to the stock pulley.
Here's the stock pulley before I removed it
My harmonic balancer puller set up and ready to go.
Here's the ASP pulley installed.
Now to find a smaller drive belt. No one seems to know the exact size, so I'll have to thread a rope around my pulleys and take it to the auto parts store for sizing.
Completed install with a new smaller, 92inch drive belt.
The install was pretty easy. You will need a harmonic balancer puller. I paid $15.00 for mine, but you can rent them from most auto parts stores. I found out after I bought my puller that the parts store I bought my pulley from will let you use their puller free when you buy from them, DOH! My life story
You can check out the whole ASP Performance line HERE 
PAGE 1-Introduction
PAGE 2-Dual Exhaust Installation
PAGE 3-Cold Air Intake Installation
PAGE 4-Under Drive Puley Installation
PAGE 5-Possi and 4:10 Rear End gears
PAGE 6-Our Bad Ass Trucks
