The Stovebolt Site Forums The Parking Lot Big Bolts Diesel Engine for my '59 3800

I would tend to push you towards a 6spd if you have the choice. In my 2007 GMC 4500 I have the 6.6 with the Alison 5 spd, and as much as I like it, I know guys with the 6 (and have driven their trucks) and if I had it to do again.... I wont buy another 5...
~Gator