Go to Marlins site and read the install instructions on this page:

http://www.marlincrawler.com/dualcase.html

As far as the d-shaft, the length should not be messed with until after the install. Most shops in my area have a one-day turn around and if I take it in early enough I can get in back in the afternoon. Around here a two piece d-shaft goes for 150-200 dollars with center bearing and they will not break them up.

David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA

"Serenity through Sobriety"