Final Drive Ratio for pulling a VP?

[dieselpolaris]

What final drive ratio works good for pulling a vp powered truck that fuels to 3500 rpms and has all the stuff in my sig.Its an 01 six speed and right now I'm at 13.4 to 1 in 4th gear with 3.55 gears.3rd is almost 20 to 1. Is this too high or what do u guys recommend...

 

[kipo]

4th worked good for me with 33's.
probably better posted in the "sled pulling" section.