Simple enough to figure that out when you get there, and have the work done at a driveshaft shop.

Here's some interesting reading on the subject (homework) in the meantime
http://www.stovebolt.com/techtips/driveline/setup/index.html

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-