Originally Posted by Photo
My concern is transmission size - I would like to leave the master cylinder and booster beneath the floor, but I'm not sure if I'll have room along side the Allison.

I don't have a really good picture up, but take a look at these
http://rides.webshots.com/photo/2058331900080251109TjwEMM
http://rides.webshots.com/photo/2761442110080251109HsfdcV
I managed to fit the hydrobooster and master beside my Roadranger, and I believe an Allison 1000 or 3000 (same case size) is smaller.
If I were to do it again I would mount the booster and master on a stand alone bracket about a foot back and run a long tubular push rod (about 7/8" diameter?) back to operate it from the stock brake pedal.

Consider changing axle gears to make it suit your driving habits and get good fuel economy, fuel is expensive down here, but even more so up where you are..

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-